Quectel EC20 AT Commands Manual V1.3

Quectel_EC20_AT_Commands_Manual_V1.3

Quectel_EC20_AT_Commands_Manual_V1.3

Quectel_EC20_AT_Commands_Manual_V1.3(15210567816%E5%90%95)

Quectel_EC20_AT_Commands_Manual_V1.3

User Manual:

Open the PDF directly: View PDF PDF.
Page Count: 231 [warning: Documents this large are best viewed by clicking the View PDF Link!]

EC20
AT Commands Manual
LTE Module Series
Rev. EC20_AT_Commands_Manual_V1.3
Date: 2016-07-21
www.quectel.com
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 1 / 230
Our aim is to provide customers with timely and comprehensive service. For any
assistance, please contact our company headquarters:
Quectel Wireless Solutions Co., Ltd.
Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233
Tel: +86 21 5108 6236
Email: info@quectel.com
Or our local office. For more information, please visit:
http://www.quectel.com/support/salesupport.aspx
For technical support, or to report documentation errors, please visit:
http://www.quectel.com/support/techsupport.aspx
Or email to: Support@quectel.com
GENERAL NOTES
QUECTEL OFFERS THE INFORMATION AS A SERVICE TO ITS CUSTOMERS. THE INFORMATION
PROVIDED IS BASED UPON CUSTOMERS‟ REQUIREMENTS. QUECTEL MAKES EVERY EFFORT
TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE. QUECTEL DOES NOT
MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN, AND DOES NOT ACCEPT
ANY LIABILITY FOR ANY INJURY, LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR
RELIANCE UPON THE INFORMATION. THE INFORMATION SUPPLIED HEREIN IS SUBJECT TO
CHANGE WITHOUT PRIOR NOTICE.
COPYRIGHT
THE INFORMATION CONTAINED HERE IS PROPRIETARY TECHNICAL INFORMATION OF
QUECTEL CO., LTD. TRANSMITTING, REPRODUCTION, DISSEMINATION AND EDITING OF THIS
DOCUMENT AS WELL AS UTILIZATION OF THE CONTENT ARE FORBIDDEN WITHOUT
PERMISSION. OFFENDERS WILL BE HELD LIABLE FOR PAYMENT OF DAMAGES. ALL RIGHTS
ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL
OR DESIGN.
Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 2 / 230
About the Document
History
Revision
Date
Author
Description
1.0
2015-02-13
Francis TANG
Initial
1.1
2015-07-14
Rex ZHANG/
Francis TANG
1. Added summary of UART
2. Added AT commands: AT+IPR/AT+QCCID
3. Modified the description of AT commands:
AT+QCFG="nwscanmode"/AT+QCFG="nwscanse
q"/AT+QCFG="band"/AT+CSQ/AT+QURCCFG
1.2
2015-11-02
Rex ZHANG/
Francis TANG
1. Added AT commands:
AT+IFC/+++/AT+QNWINFO/AT+QGDCNT/AT+QA
UGDCNT/AT+QTONEDET/AT+QPINC/AT+QSIMD
ET/AT+QSIMSTAT/AT+QCSMP/AT+QSMSR/AT+
QCFG="TDSCSQ"/AT+QSMSL/AT+QCFG="PDP/
DuplicateChk"/AT+QCFG="apready"
2. Updated the Table of AT command settings with
AT&F/AT&W/URC
3. Updated the description for AT command in CDMA
Network
1.3
2016-07-21
Francis TANG
1. Updated the parameter description for
AT+COPS/AT+QDAI/AT+QCFG=”nwscanseq”/AT+
QCFG="band"
2. Added AT commands:
AT+QCFG="airplanecontrol"/AT+QCFG="risignalty
pe"/AT+QCFG=“urc/ri/ring”/AT+QCFG="urc/ri/smsi
ncoming"/AT+QCFG="urc/ri/other"/AT+QCFG=”us
bid”/AT+QCFG=”ehrpd”/AT+QCFG=”tone/incoming
”/AT+QRIR/AT+QLTS/AT+VTD/AT+QMIC/AT+QRX
GAIN
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 3 / 230
Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 8
1 Introduction .......................................................................................................................................... 9
1.1. Scope of the Document ............................................................................................................. 9
1.2. AT Command Syntax ................................................................................................................. 9
1.3. Supported Character Sets ....................................................................................................... 10
1.4. AT Command Interface ............................................................................................................ 10
1.5. Unsolicited Result Code .......................................................................................................... 10
1.6. Turn off Procedure ................................................................................................................... 11
2 General Commands ........................................................................................................................... 12
2.1. ATI Display Product Identification Information ...................................................................... 12
2.2. AT+GMI Request Manufacturer Identification ...................................................................... 13
2.3. AT+GMM Request TA Model Identification ........................................................................... 13
2.4. AT+GMR Request TA Revision Identification of Software Release ..................................... 14
2.5. AT+CGMI Request Manufacturer Identification .................................................................... 14
2.6. AT+CGMM Request TA Model Identification ........................................................................ 15
2.7. AT+CGMR Request TA Revision Identification of Software Release ................................... 15
2.8. AT+GSN Request International Mobile Equipment Identity (IMEI) ...................................... 16
2.9. AT+CGSN Request Product Serial Number Identification ................................................... 17
2.10. AT&F Set all Current Parameters to Manufacturer Defaults ................................................ 17
2.11. AT&V Display Current Configuration .................................................................................... 18
2.12. AT&W Store Current Parameters to User Defined Profile .................................................... 19
2.13. ATZ Set all Current Parameters to User Defined Profile ...................................................... 19
2.14. ATQ Set Result Code Presentation Mode ............................................................................ 20
2.15. ATV TA Response Format .................................................................................................... 20
2.16. ATE Set Command Echo Mode ............................................................................................ 22
2.17. A/ Repeat Previous Command Line ..................................................................................... 22
2.18. ATS3 Set Command Line Termination Character ................................................................. 23
2.19. ATS4 Set Response Formatting Character .......................................................................... 24
2.20. ATS5 Set Command Line Editing Character ........................................................................ 24
2.21. ATX Set CONNECT Result Code Format and Monitor Call Progress ................................. 25
2.22. AT+CFUN Set Phone Functionality ...................................................................................... 26
2.23. AT+CMEE Error Message Format ........................................................................................ 27
2.24. AT+CSCS Select TE Character Set ...................................................................................... 28
2.25. AT+QURCCFG Configure URC Indication Option ............................................................... 29
3 Serial Interface Control Commands ................................................................................................ 31
3.1. AT&C Set DCD Function Mode ............................................................................................ 31
3.2. AT&D Set DTR Function Mode ............................................................................................. 31
3.3. AT+ICF Set TE-TA Control Character Framing .................................................................... 32
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 4 / 230
3.4. AT+IFC Set TE-TA Local Data Flow Control ......................................................................... 33
3.5. AT+IPR Set TE-TA Fixed Local Rate .................................................................................... 34
3.6. AT+QRIR Restore Ring indicator to Inactive ........................................................................ 35
4 Status Control Commands ............................................................................................................... 36
4.1. AT+CPAS Mobile Equipment Activity Status ......................................................................... 36
4.2. AT+CEER Extended Error Report ........................................................................................... 37
4.3. AT+QCFG Extended Configuration Settings ........................................................................ 38
4.3.1. AT+QCFG="gprsattach" GPRS Attach Mode Configuration ....................................... 40
4.3.2. AT+QCFG="nwscanmode" Network Search Mode Configuration.............................. 40
4.3.3. AT+QCFG="nwscanseq" Network Searching Sequence Configuration ..................... 41
4.3.4. AT+QCFG="roamservice" Roam Service Configuration ............................................ 42
4.3.5. AT+QCFG="servicedomain" Service Domain Configuration ...................................... 43
4.3.6. AT+QCFG="band" Band Configuration ...................................................................... 44
4.3.7. AT+QCFG="hsdpacat" HSDPA Category Configuration............................................. 45
4.3.8. AT+QCFG="hsupacat" HSUPA Category Configuration ............................................ 46
4.3.9. AT+QCFG="rrc" RRC Release Version Configuration ............................................... 47
4.3.10. AT+QCFG="sgsn" UE SGSN Release Version Configuration ................................... 48
4.3.11. AT+QCFG="msc" UE MSC Release Version Configuration ....................................... 49
4.3.12. AT+QCFG="PDP/DuplicateChk" Establish Multi PDNs with the Same APN ............. 49
4.3.13. AT+QCFG="TDSCSQ" Set TDSCDMA RSSI Range ................................................. 50
4.3.14. AT+QCFG="airplanecontrol" Enable/Disable Airplane Mode Detection ..................... 51
4.3.15. AT+QCFG="apready" AP Ready Detection Configuration ......................................... 52
4.3.16. AT+QCFG="risignaltype" Ring indicator Signal Outputting Carrier ............................ 54
4.3.17. AT+QCFG="urc/ri/ring" Ring indicator Behaviors of RING ......................................... 55
4.3.18. AT+QCFG="urc/ri/smsincoming" Ring indicator Behaviors of Incoming SMS ........... 56
4.3.19. AT+QCFG="urc/ri/other" Ring indicator Behaviors of Other URCs ............................ 57
4.3.20. AT+QCFG="usbid" Set USB Vendor Id and Product Id .............................................. 58
4.3.21. AT+QCFG="ehrpd" Configure the EHRPD Mode ....................................................... 58
4.3.22. AT+QCFG="tone/incoming" Enable/Disable Ringing Tone ........................................ 59
5 SIM Related Commands .................................................................................................................... 60
5.1. AT+CIMI Request International Mobile Subscriber Identity (IMSI) ....................................... 60
5.2. AT+CLCK Facility Lock ......................................................................................................... 61
5.3. AT+CPIN Enter PIN .............................................................................................................. 63
5.4. AT+CPWD Change Password .............................................................................................. 65
5.5. AT+CSIM Generic SIM Access ............................................................................................. 66
5.6. AT+CRSM Restricted SIM Access ........................................................................................ 67
5.7. AT+QCCID Show ICCID ....................................................................................................... 68
5.8. AT+QPINC Display PIN Remainder Counter........................................................................ 69
5.9. AT+QSIMDET SIM Card Detection ....................................................................................... 69
5.10. AT+QSIMSTAT SIM Inserted Status Report ......................................................................... 71
6 Network Service Commands ............................................................................................................ 73
6.1. AT+COPS Operator Selection .............................................................................................. 73
6.2. AT+CREG Network Registration ........................................................................................... 75
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 5 / 230
6.3. AT+CSQ Signal Quality Report ............................................................................................. 77
6.4. AT+CPOL Preferred Operator List ........................................................................................ 79
6.5. AT+COPN Read Operator Names ........................................................................................ 80
6.6. AT+CTZU Automatic Time Zone Update .............................................................................. 81
6.7. AT+CTZR Time Zone Reporting ........................................................................................... 82
6.8. AT+QLTS Obtain the Latest Network Time Synchronization ................................................ 83
6.9. AT+QNWINFO Query Network Information .......................................................................... 84
7 Call Related Commands .................................................................................................................... 87
7.1. ATA Answer an Incoming Call ............................................................................................... 87
7.2. ATD Mobile Originated Call to Dial a Number ...................................................................... 88
7.3. ATH Disconnect Existing Connection ................................................................................... 89
7.4. AT+CVHU Voice Hang Up Control........................................................................................ 90
7.5. AT+CHUP Hang Up Call ....................................................................................................... 91
7.6. +++ Switch From Data Mode to Command Mode ................................................................ 91
7.7. ATO Switch From Command Mode to Data Mode ............................................................... 92
7.8. ATS0 Set Number of Rings before Automatically Answering Call ........................................ 93
7.9. ATS6 Set Pause Before Blind Dialing ................................................................................... 94
7.10. ATS7 Set Number of Seconds to Wait for Connection Completion...................................... 94
7.11. ATS8 Set the Number of Seconds to Wait for Comma Dial Modifier ................................... 95
7.12. ATS10 Set Disconnect Delay after Indicating the Absence of Data Carrier ......................... 95
7.13. AT+CBST Select Bearer Service Type ................................................................................. 96
7.14. AT+CSTA Select Type of Address ........................................................................................ 98
7.15. AT+CLCC List Current Calls of ME....................................................................................... 99
7.16. AT+CR Service Reporting Control ...................................................................................... 101
7.17. AT+CRC Set Cellular Result Codes for Incoming Call Indication ...................................... 101
7.18. AT+CRLP Select Radio Link Protocol Parameter .............................................................. 103
7.19. AT+QECCNUM Configure Emergency Call Numbers ........................................................ 104
8 Phonebook Commands ................................................................................................................... 107
8.1. AT+CNUM Subscriber Number ........................................................................................... 107
8.2. AT+CPBF Find Phonebook Entries .................................................................................... 108
8.3. AT+CPBR Read Phonebook Entries .................................................................................. 109
8.4. AT+CPBS Select Phonebook Memory Storage .................................................................. 110
8.5. AT+CPBW Write Phonebook Entry ......................................................................................111
9 Short Message Service Commands ............................................................................................... 113
9.1. AT+CSMS Select Message Service (Not Effective in CDMA Network) ............................. 113
9.2. AT+CMGF Message Format ............................................................................................... 114
9.3. AT+CSCA Service Center Address (Not Supported in CDMA Network) ............................ 115
9.4. AT+CPMS Preferred Message Storage .............................................................................. 116
9.5. AT+CMGD Delete Message ............................................................................................... 118
9.6. AT+CMGL List Messages ................................................................................................... 119
9.7. AT+CMGR Read Message ................................................................................................. 122
9.8. AT+CMGS Send Message .................................................................................................. 127
9.9. AT+CMMS More Messages to Send (Not Effective in CDMA Network) ............................ 128
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 6 / 230
9.10. AT+CMGW Write Message to Memory............................................................................... 129
9.11. AT+CMSS Send Message From Storage ........................................................................... 131
9.12. AT+CNMA New Message Acknowledgement to UE/TE (Not Effective in CDMA Network)133
9.13. AT+CNMI SMS Event Reporting Configuration .................................................................. 134
9.14. AT+CSCB Select Cell Broadcast Message Types (Not Effective in CDMA Network) ........ 137
9.15. AT+CSDH Show SMS Text Mode Parameters (Not Effective in CDMA Network) ............. 138
9.16. AT+CSMP Set SMS Text Mode Parameters (Not Effective in CDMA Network) ................. 139
9.17. AT+QCSMP Set CDMA SMS Text Mode Parameters ........................................................ 140
9.18. AT+QSMSR Read Message ............................................................................................... 141
9.19. AT+QSMSL List Messages ................................................................................................. 145
10 Packet Domain Commands ............................................................................................................ 149
10.1. AT+CGATT Attachment or Detachment of PS .................................................................... 149
10.2. AT+CGDCONT Define PDP Context .................................................................................. 150
10.3. AT+CGQREQ Quality of Service Profile (Requested) ........................................................ 151
10.4. AT+CGQMIN Quality of Service Profile (Minimum Acceptable) ......................................... 154
10.5. AT+CGEQREQ 3G Quality of Service Profile (Requested) ............................................... 157
10.6. AT+CGEQMIN 3G Quality of Service Profile (Minimum Acceptable) ................................. 161
10.7. AT+CGACT Activate or Deactivate PDP Context ............................................................... 165
10.8. AT+CGDATA Enter Data State ............................................................................................ 166
10.9. AT+CGPADDR Show PDP Address ................................................................................... 167
10.10. AT+CGCLASS GPRS Mobile Station Class ....................................................................... 168
10.11. AT+CGREG Network Registration Status ........................................................................... 169
10.12. AT+CGEREP Packet Domain Event Reporting .................................................................. 171
10.13. AT+CGSMS Select Service for MO SMS Messages .......................................................... 173
10.14. AT+CEREG EPS Network Registration Status ................................................................... 174
10.15. AT+QGDCNT GPRS Data Counter .................................................................................... 175
10.16. AT+QAUGDCNT Auto Save GPRS Data Counter ............................................................. 177
11 Supplementary Service Commands .............................................................................................. 179
11.1. AT+CCFC Call Forwarding Number and Conditions Control ............................................. 179
11.2. AT+CCWA Call Waiting Control .......................................................................................... 181
11.3. AT+CHLD Call Related Supplementary Services ............................................................... 183
11.4. AT+CLIP Calling Line Identification Presentation ............................................................... 185
11.5. AT+CLIR Calling Line Identification Restriction .................................................................. 186
11.6. AT+COLP Connected Line Identification Presentation ....................................................... 187
11.7. AT+CSSN Supplementary Service Notifications ................................................................ 189
11.8. AT+CUSD Unstructured Supplementary Service Data ...................................................... 190
12 Audio Commands ............................................................................................................................ 192
12.1. AT+CLVL Loud Speaker Volume Level ............................................................................... 192
12.2. AT+CMUT Mute Control ...................................................................................................... 192
12.3. AT+VTS DTMF and Tone Generation ................................................................................. 193
12.4. AT+VTD Tone Duration ....................................................................................................... 194
12.5. AT+QAUDMOD Set Audio Mode ........................................................................................ 195
12.6. AT+QDAI Digital Audio Interface Configuration .................................................................. 196
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 7 / 230
12.7. AT+QSIDET Set the Side Tone Gain in Current Mode ....................................................... 198
12.8. AT+QAUDLOOP Enable Audio Loop Test .......................................................................... 198
12.9. AT+QMIC Set up-link (MIC) Gains ........................................................................................ 199
12.10. AT+QTONEDET Enable/Disable DTMF Detection ........................................................... 200
12.11. AT+QRXGAIN Set Down-link (RX) Gains ........................................................................... 201
13 Hardware Related Commands ........................................................................................................ 203
13.1. AT+QPOWD Power Off ....................................................................................................... 203
13.2. AT+CCLK Clock .................................................................................................................. 203
13.3. AT+CBC Battery Charge ..................................................................................................... 204
13.4. AT+QADC Read ADC ......................................................................................................... 205
13.5. AT+QSCLK Configure Whether or not to Enter into Sleep Mode....................................... 206
14 Appendix ........................................................................................................................................... 207
14.1. Reference .............................................................................................................................. 207
14.2. Factory Default Settings Restorable with AT&F .................................................................... 208
14.3. AT Command Settings Storable with AT&W .......................................................................... 210
14.4. AT Command Settings Storable with ATZ ............................................................................. 211
14.5. Summary of CME ERROR Codes ......................................................................................... 212
14.6. Summary of CMS ERROR Codes ......................................................................................... 213
14.7. Summary of URC................................................................................................................... 215
14.8. SMS Character Sets Conversions ......................................................................................... 217
14.9. Release Cause Text List of AT+CEER .................................................................................. 224
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 8 / 230
Table Index
TABLE 1: TYPES OF AT COMMANDS AND RESPONSES ..................................................................... 10
TABLE 2: AT&V RESPONSE ..................................................................................................................... 18
TABLE 3: ATV0&ATV1 RESULT CODES NUMERIC EQUIVALENTS AND BRIEF DESCRIPTION ........ 21
TABLE 4: PARAMETERS CONFIGURATIONS SUPPORTED BY AT+CBST .......................................... 97
TABLE 5: DELAY CLASS ......................................................................................................................... 154
TABLE 6: RELATED DOCUMENTS ........................................................................................................ 207
TABLE 7: TERMS AND ABBREVIATIONS .............................................................................................. 207
TABLE 8: FACTORY DEFAULT SETTINGS RESTORABLE WITH AT&F .............................................. 208
TABLE 9: AT COMMAND SETTINGS STORABLE WITH AT&W ............................................................ 210
TABLE 10: AT COMMAND SETTINGS STORABLE WITH ATZ .............................................................. 211
TABLE 11: DIFFERENT CODING SCHEMES OF +CME ERROR: <ERR> ........................................... 212
TABLE 12: DIFFERENT CODING SCHEMES OF +CMS ERROR: <ERR> ........................................... 214
TABLE 13: SUMMARY OF URC .............................................................................................................. 215
TABLE 14: THE WAY OF SMS TEXT INPUT OR OUTPUT .................................................................... 218
TABLE 15: THE INPUT CONVERSIONS TABLE (DCS=GSM 7 BIT AND AT+CSCS=“GSM”) .............. 218
TABLE 16: THE OUTPUT CONVERSIONS TABLE (DCS=GSM 7 BIT AND AT+CSCS=“GSM”) .......... 219
TABLE 17: GSM EXTENDED CHARACTERS ........................................................................................ 220
TABLE 18: THE INPUT CONVERSIONS TABLE (DCS=GSM 7 BIT AND AT+CSCS=“IRA”) ................ 220
TABLE 19: IRA EXTENDED CHARACTERS........................................................................................... 221
TABLE 20: THE OUTPUT CONVERSIONS TABLE (DCS=GSM 7 BIT AND AT+CSCS=“IRA”) ............ 222
TABLE 21: GSM EXTENDED CHARACTERS ........................................................................................ 223
TABLE 22: RELEASE CAUSE TEXT LIST OF AT+CEER ....................................................................... 224
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 9 / 230
1 Introduction
1.1. Scope of the Document
This document presents the AT Commands Set for Quectel cellular engine EC20.
1.2. AT Command Syntax
The “AT” or “at” prefix must be set at the beginning of each command line. To terminate a command line
enter <CR>. Commands are usually followed by a response that includes
“<CR><LF><response><CR><LF>”. Throughout this document, only the responses are presented,
“<CR><LF>” are omitted intentionally.
The AT Commands Set implemented by EC20 is a combination of 3GPP TS 27.007, 3GPP TS 27.005
and ITU-T recommendation V.25ter and the AT Commands developed by Quectel.
All these AT commands can be split into three categories syntactically: “basic”, “S parameter”, and
“extended”. They are listed as follows:
- Basic syntax
These AT commands have the format of “AT<x><n>”, or “AT&<x><n>”, where “<x>” is the command, and
“<n>” is/are the argument(s) for that command. An example of this is “ATE<n>”, which tells the DCE
whether received characters should be echoed back to the DTE according to the value of “<n>”. “<n>” is
optional and a default will be used if it is missing.
- S parameter syntax
These AT commands have the format of “ATS<n>=<m>”, where “<n>” is the index of the S register to set,
and “<m>” is the value to assign to it.
- Extended syntax
These commands can be operated in several modes, as following table:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 10 / 230
Table 1: Types of AT Commands and Responses
1.3. Supported Character Sets
The EC20 AT command interface defaults to the GSM character set. The EC20 supports the following
character sets:
- GSM
- UCS2
- IRA
The character set can be configured and interrogated by using the “AT+CSCS” command (3GPP TS
27.007) and it is defined in 3GPP TS 27.005. The character set affects transmission and reception of SMS
and SMS Cell Broadcast Messages, the entry and display of phone book entries text field.
1.4. AT Command Interface
The EC20 AT command interface includes two USB ports (USB MODEM port and USB AT port) and one
main UART port. The main UART port and two USB ports support AT command and data transfer.
1.5. Unsolicited Result Code
As an Unsolicited Result Code and a report message, URC is not issued as part of the response related
to an executed AT command. URC is issued by the EC20 without being requested by the TE and it is
issued automatically when a certain event occurs. Typical events leading to URCs are incoming calls
(“RING”), received short messages, high/low voltage alarm, high/low temperature alarm etc.
Test Command
This command returns the list of parameters and value ranges
set by the corresponding write command or internal processes.
Read Command
This command returns the currently set value of the parameter
or parameters.
Write Command
This command sets the user-definable parameter values.
Execution
Command
This command reads non-variable parameters affected by
internal processes in the UE.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 11 / 230
1.6. Turn off Procedure
It is recommended to execute AT+QPOWD command to turn off the module, as it is the safest and best
way. This procedure is realized by letting the module log off from the network and allowing the software to
enter into a secure and safe data state before disconnecting the power supply.
After sending AT+QPOWD, do not enter any other AT commands. The module outputs message
“POWERED DOWN” and sets the STATE pin as low to enter into the shutdown state. In order to avoid
data loss, it is suggested to wait for 1s to switch off the VBAT after the STATUS pin is set as low and the
URC “POWERED DOWN” is outputted. If “POWERED DOWN” has not been received after 65s, you
should force to switch off the VBAT.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 12 / 230
2 General Commands
2.1. ATI Display Product Identification Information
The ATI command delivers a product information text.
Parameter
Example
ATI
Quectel
EC20
Revision: EC20EQAR01A01E2G
OK
ATI Display Product Identification Information
Execution Command
ATI
Response
TA issues product information text.
Quectel
EC20
Revision: <revision>
OK
Maximum Response Time
300ms
Reference
V.25ter
<revision> Revision of software release
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 13 / 230
2.2. AT+GMI Request Manufacturer Identification
AT+GMI returns a manufacturer identification text. Command is identical with AT+CGMI.
2.3. AT+GMM Request TA Model Identification
AT+GMM returns a product model identification text. Command is identical with AT+CGMM.
AT+GMI Request Manufacturer Identification
Test Command
AT+GMI=?
Response
OK
Execution Command
AT+GMI
Response
TA reports one or more lines of information text which permit
the user to identify the manufacturer.
Quectel
OK
Maximum Response Time
300ms
Reference
V.25ter
AT+GMM Request TA Model Identification
Test Command
AT+GMM=?
Response
OK
Execution Command
AT+GMM
Response
TA returns a product model identification text.
EC20
OK
Maximum Response Time
300ms
Reference
V.25ter
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 14 / 230
2.4. AT+GMR Request TA Revision Identification of Software Release
AT+GMR delivers a product firmware version identification. Command is identical with AT+CGMR.
Parameter
Example
AT+GMR
EC20EQAR01A01E2G
OK
2.5. AT+CGMI Request Manufacturer Identification
AT+CGMI returns a manufacturer identification text. Command is identical with AT+GMI.
AT+GMR Request TA Revision Identification of Software Release
Test Command
AT+GMR=?
Response
OK
Execution Command
AT+GMR
Response
TA reports one or more lines of information text which permit
the user to identify the revision of software release.
<revision>
OK
Maximum Response Time
300ms
Reference
V.25ter
<revision> Revision of software release
AT+CGMI Request Manufacturer Identification
Test Command
AT+CGMI=?
Response
OK
Execution Command
AT+CGMI
Response
TA returns manufacturer identification text.
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 15 / 230
2.6. AT+CGMM Request TA Model Identification
AT+CGMM returns a product model identification text. Command is identical with AT+GMM.
2.7. AT+CGMR Request TA Revision Identification of Software Release
AT+CGMR delivers a product firmware version identification. Command is identical with AT+GMR.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
AT+CGMM Request TA Model Identification
Test Command
AT+CGMM=?
Response
OK
Execution Command
AT+CGMM
Response
TA returns product model identification text.
EC20
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
AT+CGMR Request TA Revision Identification of Software Release
Test Command
AT+CGMR=?
Response
OK
Execution Command
AT+CGMR
Response
TA returns identification text of product software version.
<revision>
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 16 / 230
Parameter
2.8. AT+GSN Request International Mobile Equipment Identity (IMEI)
AT+GSN returns the International Mobile Equipment Identity (IMEI). Command is identical with
AT+CGSN.
Parameter
The serial number (IMEI) varies with the individual ME device.
<revision> Identification text of product software version
AT+GSN Request International Mobile Equipment Identity (IMEI)
Test Command
AT+GSN=?
Response
OK
Execution Command
AT+GSN
Response
TA reports the IMEI (International Mobile Equipment Identity)
number in information text which permit the user to identify
the individual ME device.
<IMEI>
OK
Maximum Response Time
300ms
Reference
V.25ter
<IMEI> IMEI of the telephone
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 17 / 230
2.9. AT+CGSN Request Product Serial Number Identification
AT+CGSN returns International Mobile Equipment Identity (IMEI). Command is identical with AT+GSN.
Parameter
The serial number (IMEI) varies with the individual ME device.
2.10. AT&F Set all Current Parameters to Manufacturer Defaults
AT&F resets AT command settings to their factory default values.
AT+CGSN Request Product Serial Number Identification
Test Command
AT+CGSN=?
Response
OK
Execution Command
AT+CGSN
Response
<IMEI>
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<IMEI> IMEI of the telephone
AT&F Set all Current Parameters to Manufacturer Defaults
Execution Command
AT&F[<value>]
Response
TA sets all current parameters to the manufacturer defined
profile. See Table 8: Factory Default Settings Restorable with
AT&F.
OK
Maximum Response Time
300ms
Reference
V.25ter
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 18 / 230
Parameter
2.11. AT&V Display Current Configuration
AT&V displays the current settings of several AT command parameters, including the single-letter AT
command parameters which are not readable otherwise.
Table 2: AT&V Response
<value> 0 Set all TA parameters to manufacturer defaults
AT&V Display Current Configuration
Execution Command
AT&V
Response
TA returns the current parameter setting
See Table 2: AT&V Response
OK
Maximum Response Time
300ms
Reference
V.25ter
AT&V
&C: 1
&D: 1
&F: 0
&W: 0
E: 1
Q: 0
V: 1
X: 4
Z: 0
S0: 0
S3: 13
S4: 10
S5: 8
S6: 2
S7: 0
S8: 2
S10: 15
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 19 / 230
2.12. AT&W Store Current Parameters to User Defined Profile
AT&W stores the current AT command settings to a user defined profile in non-volatile memory.
Parameter
2.13. ATZ Set all Current Parameters to User Defined Profile
ATZ restores the current AT command settings to the user defined profile in non-volatile memory, if one
was stored with AT&W before. Any additional AT command on the same command line may be ignored.
OK
AT&W Store Current Parameters to User Defined Profile
Execution Command
AT&W[<n>]
Response
TA stores the current parameter settings in the user defined
profile. See Table 9: AT Command Settings Storable with
AT&W.
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0 Profile number to store current parameters
ATZ Set all Current Parameters to User Defined Profile
Execution Command
ATZ[<value>]
Response
TA sets all current parameters to the user defined profile. See
Table 10: AT Command Settings Storable with ATZ.
OK
Maximum Response Time
300ms
Reference
V.25ter
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 20 / 230
Parameter
2.14. ATQ Set Result Code Presentation Mode
ATQ controls whether the result code is transmitted to the CE. Other information text transmitted as
response is not affected.
Parameter
2.15. ATV TA Response Format
This command determines the contents of header and trailer transmitted with AT command result codes
and information responses.
The result codes, their numeric equivalents and brief descriptions of the use of each are listed in the
following table.
<value> 0 Reset to profile number 0
ATQ Set Result Code Presentation Mode
Execution Command
ATQ<n>
Response
This parameter setting determines whether or not the TA
transmits any result code to the TE. Information text
transmitted in response is not affected by this setting.
If <n>=0:
OK
If <n>=1:
(none)
Maximum Response Time
300ms
Reference
V.25ter
<n> 0 TA transmits result code
1 Result codes are suppressed and not transmitted
ATV TA Response Format
Execution Command
ATV<value>
Response
This parameter setting determines the contents of the header
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 21 / 230
Parameter
Example
ATV1 //Set <value>=1
OK
AT+CSQ
+CSQ: 30,99
OK //When <value>=1 result code is OK
ATV0 //Set <value>=0
0
AT+CSQ
+CSQ: 30,99
0 //When <value>=0 result code is 0
Table 3: ATV0&ATV1 Result Codes Numeric Equivalents and Brief Description
and trailer transmitted with result codes and information
responses.
When <value>=0
0
When <value>=1
OK
Maximum Response Time
300ms
Reference
V.25ter
<value> 0 Information response: <text><CR><LF>
Short result code format: <numeric code><CR>
1 Information response: <CR><LF><text><CR><LF>
Long result code format: <CR><LF><verbose code><CR><LF>
ATV1
ATV0
Description
OK
0
Acknowledges execution of a command
CONNECT
1
A connection has been established; the DCE is moving
from command state to online data state
RING
2
The DCE has detected an incoming call signal from
network
NO CARRIER
3
The connection has been terminated or the attempt to
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 22 / 230
2.16. ATE Set Command Echo Mode
ATE controls if the module echoes characters received from TE during AT command state.
Parameter
2.17. A/ Repeat Previous Command Line
A/ repeats previous AT command line, and “/” acts as the line terminating character.
establish a connection failed
ERROR
4
Command not recognized, command line maximum
length exceeded, parameter value invalid, or other
problem with processing the command line
NO DIALTONE
6
No dial tone detected
BUSY
7
Engaged (busy) signal detected
NO ANSWER
8
“@” (Wait for Quiet Answer) dial modifier was used, but
remote ringing followed by five seconds of silence was
not detected before expiration of the connection timer
(S7)
ATE Set Command Echo Mode
Execution Command
ATE<value>
Response
This setting determines whether or not the TA echoes
characters received from TE during command state.
OK
Maximum Response Time
300ms
Reference
V.25ter
<value> 0 Echo mode off
1 Echo mode on
A/ Repeat Previous Command Line
Execution Command
A/
Response
Repeat previous command
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 23 / 230
Example
ATI
Quectel
EC20
Revision: EC20EQAR01A01E2G
OK
A/ //Repeat previous command
Quectel
EC20
Revision: EC20EQAR01A01E2G
OK
2.18. ATS3 Set Command Line Termination Character
ATS3 determines the character recognized by the module to terminate an incoming command line. It is
also generated for result codes and information text, along with character value set via ATS4.
Parameter
Reference
V.25ter
ATS3 Set Command Line Termination Character
Read Command
ATS3?
Response
<n>
OK
Write Command
ATS3=<n>
Response
This parameter setting determines the character recognized
by TA to terminate an incoming command line. The TA also
returns this character in output.
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0-13-127 Command line termination character (Default 13=<CR>)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 24 / 230
2.19. ATS4 Set Response Formatting Character
ATS4 determines the character generated by the module for result code and information text, along with
the command line termination character set via ATS3.
Parameter
2.20. ATS5 Set Command Line Editing Character
ATS5 determines the character value used by the module to delete the immediately preceding character
from the AT command line (i.e. equates to backspace key).
ATS4 Set Response Formatting Character
Read Command
ATS4?
Response
<n>
OK
Write Command
ATS4=<n>
Response
This parameter setting determines the character generated
by the TA for result code and information text.
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0-10-127 Response formatting character (Default 10=<LF>)
ATS5 Set Command Line Editing Character
Read Command
ATS5?
Response
<n>
OK
Write Command
ATS5=<n>
Response
This parameter setting determines the character recognized
by TA as a request to delete the immediately preceding
character from the command line.
OK
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 25 / 230
Parameter
2.21. ATX Set CONNECT Result Code Format and Monitor Call Progress
ATX determines whether or not the module transmits particular result codes to the TE. It also controls
whether or not the module verifies the presence of a dial tone when it begins dialing, and whether or not
engaged tone (busy signal) detection is enabled.
Parameter
Reference
V.25ter
<n> 0-8-127 Response editing character (Default 8=<Backspace>)
ATX Set CONNECT Result Code Format and Monitor Call Progress
Execution Command
ATX<value>
Response
This parameter setting determines whether or not the TA
detected the presence of dial tone and busy signal and
whether or not TA transmits particular result codes.
OK
Maximum Response Time
300ms
Reference
V.25ter
<value> 0 CONNECT result code only returned, dial tone and busy detection are both
disabled
1 CONNECT<text> result code only returned, dial tone and busy detection are
both disabled
2 CONNECT<text> result code returned, dial tone detection is enabled, busy
detection is disabled
3 CONNECT<text> result code returned, dial tone detection is disabled, busy
detection is enabled
4 CONNECT<text> result code returned, dial tone and busy detection are both
enabled
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 26 / 230
2.22. AT+CFUN Set Phone Functionality
AT+CFUN controls the functionality level. It can also be used to reset the UE.
Parameter
Example
AT+CFUN=0 //Switch phone to minimum functionality
OK
AT+COPS?
+COPS: 0 //No operator is registered
OK
AT+CPIN?
AT+CFUN Set Phone Functionality
Test Command
AT+CFUN=?
Response
+CFUN: (list of supported <fun>s),(list of supported <rst>s)
OK
Read Command
AT+CFUN?
Response
+CFUN: <fun>
OK
Write Command
AT+CFUN=<fun>[,<rst>]
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
15s, determined by network.
Reference
3GPP TS 27.007
<fun> 0 Minimum functionality
1 Full functionality (Default)
4 Disable phone both transmit and receive RF circuits
<rst> 0 Do not reset the ME before setting it to <fun> power level.
This is default when <rst> is not given.
1 Reset the ME. The device is fully functional after the reset. This value is available
only for <fun>=1
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 27 / 230
+CME ERROR: 10 //SIM is not inserted
AT+CFUN=1 //Switch phone to full functionality
OK
+CPIN: SIM PIN
AT+CPIN=1234
OK
+CPIN: READY
+QUSIM: 1
+QIND: PB DONE
+QIND: SMS DONE
AT+CPIN?
+CPIN: READY
OK
AT+COPS?
+COPS: 0,0,"CHN-UNICOM",7 //Operator is registered
OK
2.23. AT+CMEE Error Message Format
AT+CMEE controls the format of error result codes: “ERROR”, error numbers or verbose messages as
“+CME ERROR: <err>” and “+CMS ERROR: <err>”.
AT+CMEE Error Message Format
Test Command
AT+CMEE=?
Response
+CMEE: (list of supported <n>s)
OK
Read Command
AT+CMEE?
Response
+CMEE: <n>
OK
Write Command
AT+CMEE=<n>
Response
TA disables or enables the use of result code +CME ERROR:
<err> as an indication of an error related to the functionality of
the ME.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 28 / 230
Parameter
<n> 0 Disable result code
1 Enable result code and use numeric values
2 Enable result code and use verbose values
Example
AT+CMEE=0 //Disable result code
OK
AT+CPIN?
ERROR //Only “ERROR” will be displayed
AT+CMEE=1 //Enable error result code with numeric values
OK
AT+CPIN?
+CME ERROR: 10
AT+CMEE=2 //Enable error result code with verbose (string)
values
OK
AT+CPIN?
+CME ERROR: SIM not inserted
2.24. AT+CSCS Select TE Character Set
AT+CSCS write command informs the module which character set is used by the TE. This enables the
UE to convert character strings correctly between TE and UE character sets.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
AT+CSCS Select TE Character Set
Test Command
AT+CSCS=?
Response
+CSCS: (list of supported <chest>s)
OK
Read Command
AT+CSCS?
Response
+CSCS: <chest>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 29 / 230
Parameter
Example
AT+CSCS? //Query the current character set
+CSCS: “GSM”
OK
AT+CSCS=“UCS2” //Set the character set to “UCS2”
OK
AT+CSCS?
+CSCS: “UCS2”
OK
2.25. AT+QURCCFG Configure URC Indication Option
This command is used to configure the output port of URC.
OK
Write Command
AT+CSCS=<chest>
Response
Set character set <chest> which is used by the TE. The TA
can then convert character strings correctly between the TE
and ME character sets.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<chset> “GSM” GSM default alphabet
“IRA” International reference alphabet
“UCS2” UCS2 alphabet
AT+QURCCFG Configure URC Indication Option
Test Command
AT+QURCCFG=?
Response
+QURCCFG: "urcport",(list of supported <urcportvalue>s)
OK
Write Command
AT+QURCCFG="urcport"[,<urcportv
If configuration parameters are omitted, return current
configuration:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 30 / 230
Parameter
1. Configuration of URC output port will be saved to NV immediately by default.
2. After configuration of URC output port is set successfully, it will take effect immediately.
Example
AT+QURCCFG=?
+QURCCFG: "urcport",("usbat","usbmodem","uart1")
OK
AT+QURCCFG?
+QURCCFG: "urcport","usbat"
OK
AT+QURCCFG="urcport","usbmodem"
OK
AT+QURCCFG?
+QURCCFG: "urcport","usbmodem"
OK
alue>]
+QURCCFG: "urcport",<urcportvalue>
OK
If configuration parameters are entered, response:
OK
ERROR
Read Command
AT+QURCCFG?
Response
Return current configurations:
+QURCCFG: "urcport",<urcportvalue>
OK
Maximum Response Time
300ms
Reference
Quectel
<urcportvalue> Set URC output port
"usbat" USB AT port
"usbmodem" USB modem port
"uart1" Main UART
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 31 / 230
3 Serial Interface Control Commands
3.1. AT&C Set DCD Function Mode
AT&C controls the behavior of the UE‟s DCD line.
Parameter
3.2. AT&D Set DTR Function Mode
AT&D determines how the UE responds if DTR line is changed from the ON to the OFF condition during
online data mode.
AT&C Set DCD Function Mode
Execution Command
AT&C[<value>]
Response
This parameter determines how the state of circuit 109(DCD)
relates to the detection of received line signal from the distant
end.
OK
Maximum Response Time
300ms
Reference
V.25ter
<value> 0 DCD line is always ON
1 DCD line is ON only in the presence of data carrier
AT&D Set DTR Function Mode
Execution Command
AT&D[<value>]
Response
This parameter determines how the TA responds when circuit
108/2 (DTR) is changed from the ON to the OFF condition
during data mode.
OK
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 32 / 230
Parameter
3.3. AT+ICF Set TE-TA Control Character Framing
AT+ICF determines the serial interface character framing format and parity received by TA from TE.
Parameter
Reference
V.25ter
<value> 0 TA ignores status on DTR
1 ON->OFF on DTR: Change to command mode with remaining the connected call
2 ON->OFF on DTR: Disconnect data call, change to command mode. During
state DTR = OFF, auto-answer function is disabled
AT+ICF Set TE-TA Control Character Framing
Test Command
AT+ICF=?
Response
+ICF: (list of supported <format>s),(list of supported
<parity>s)
OK
Read Command
AT+ICF?
Response
+ICF: <format>,<parity>
OK
Write Command
AT+ICF[=<format>[,<parity>]]
Response
This parameter setting determines the serial interface
character framing format and parity received by TA from TE.
OK
Maximum Response Time
300ms
Reference
V.25ter
<format> 3 8 data 0 parity 1 stop
<parity> 0 Odd
1 Even
2 Mark (1)
3 Space (0)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 33 / 230
1. The command is applied for command state.
2. The <parity> field is ignored if the <format> field specifies no parity.
3.4. AT+IFC Set TE-TA Local Data Flow Control
AT+IFC determines the flow control behavior of the serial port.
Parameter
This flow control is applied for data mode.
AT+IFC Set TE-TA Local Data Flow Control
Test Command
AT+IFC=?
Response
+IFC: (list of supported <dce_by_dte>s),(list of supported
<dte_by_dce>s)
OK
Read Command
AT+IFC?
Response
+IFC: <dce_by_dte>,<dte_by_dce>
OK
Write Command
AT+IFC=<dce_by_dte>,<dte_by_dce>
Response
This parameter setting determines the data flow control on
the serial interface for data mode.
OK
Maximum Response Time
300ms
Reference
V.25ter
<dce_by_dte> Specifies the method will be used by TE when receiving data from TA
0 None
2 RTS flow control
<dte_by_dce> Specifies the method will be used by TA when receiving data from TE
0 None
2 CTS flow control
NOTES
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 34 / 230
Example
AT+IFC=2,2 //Open the hardware flow control
OK
AT+IFC?
+IFC: 2,2
OK
3.5. AT+IPR Set TE-TA Fixed Local Rate
AT+IPR is used to query and set the baud rate of the UART. The default baud rate value (<rate>) is
115200bps. <rate> setting will not be restored with AT&F.
Parameter
AT+IPR Set TE-TA Fixed Local Rate
Test Command
AT+IPR=?
Response
+IPR: (list of supported auto detectable <rate>s),(list of
supported fixed-only <rate>s)
OK
Read Command
AT+IPR?
Response
+IPR: <rate>
OK
Write Command
AT+IPR=<rate>
Response
This parameter setting determines the data rate of the TA on
the serial interface. After the delivery of any result code
associated with the current command line, the rate of
command takes effect.
OK
Maximum Response Time
300ms
Reference
V.25ter
<rate> Baud rate per second
9600
19200
38400
57600
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 35 / 230
1. If a fixed baud rate is set, make sure that both TE (DTE, usually external processor) and TA (DCE,
Quectel module) are configured to the same rate.
2. The value of AT+IPR cannot be restored with AT&F and ATZ, but it is still storable with AT&W.
3. In multiplex mode, the baud rate cannot be changed by the write command AT+IPR=<rate>, and the
setting is invalid and not stored even if AT&W is executed after the write command.
4. A selected baud rate takes effect after the write commands are executed and acknowledged by "OK".
Example
AT+IPR=115200 //Set fixed baud rate to 115200
OK
AT&W //Store current setting, that is, the serial communication
speed is 115200 after restarting module
OK
AT+IPR?
+IPR: 115200
OK
AT+IPR=115200;&W //Set fixed baud rate to 115200 and store current setting
OK
3.6. AT+QRIR Restore Ring indicator to Inactive
If the behavior of ring indicator is "always", you should restore ring indicator to inactive state by AT+QRIR.
The behavior of ring indicator is controlled by AT+QCFG. Please refer to AT+QCFG="urc/ri/ring",
AT+QCFG="urc/ri/other" and AT+QCFG="urc/ri/smsincoming".
115200
230400
460800
921600
AT+QRIR Restore Ring indicator to Inactive State
Test Command
AT+QRIR=?
Response
OK
Execution Command
AT+QRIR
Response
OK
ERROR
Maximum Response Time
300ms
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 36 / 230
4 Status Control Commands
4.1. AT+CPAS Mobile Equipment Activity Status
AT+CPAS execute command queries the module‟s activity status.
Parameter
Example
AT+CPAS
+CPAS: 0 //Module is idle
OK
AT+CPAS Mobile Equipment Activity Status
Test Command
AT+CPAS=?
Response
+CPAS: (list of supported <pas>s)
OK
Execution Command
AT+CPAS
Response
TA returns the activity status of ME:
+CPAS: <pas>
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<pas> 0 Ready
3 Ringing
4 Call in progress or call hold
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 37 / 230
RING
AT+CLCC
+CLCC: 1,0,0,1,0,"",128
+CLCC: 2,1,4,0,0,“055165869386”,161
OK
AT+CPAS
+CPAS: 3 //Module is ringing
OK
ATA
OK
AT+CLCC
+CLCC: 1,0,0,1,0,"",128
+CLCC: 2,1,0,0,0,"055165869386",161
OK
AT+CPAS
+CPAS: 4 //Call in progress
OK
4.2. AT+CEER Extended Error Report
AT+CEER is used to query an extended error and report the cause of the last failed operation, such as:
- Fail to release call
- Fail to set up a call (both mobile originated or terminated)
- Fail to modify a call by using Supplementary Services
- Fail to activate, register, query, deactivate or deregister a Supplementary Service
- Fail to attach GPRS or fail to activate PDP context
- Fail to detach GPRS or fail to deactivate PDP context
The release cause <text> is a text to describe the cause information given by the network.
AT+CEER Extended Error Report
Test command
AT+CEER=?
Response
OK
Execution command
AT+CEER
Response
+CEER: <text>
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 38 / 230
Parameter
<text> Release cause text. Reason for the last call failure to setup or release (listed in 14.9
Release Cause Text List of AT+CEER). Both CS and PS domain call types are
reported. Cause data is captured from Call Manager events and cached locally to
later use by this command.
4.3. AT+QCFG Extended Configuration Settings
AT+QCFG is used to query and configure various settings of UE.
ERROR
If error is related to ME functionality:
+CME ERROR: <errcode>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
AT+QCFG Extended Configuration Settings
Test Command
AT+QCFG=?
Response
+QCFG: “gprsattach”,
(list of supported <attachmode>s)
+QCFG: “nwscanmode”,
(list of supported <scanmode>s),
(list of supported <effect>s)
+QCFG: “nwscanseq”,
(list of supported <scanseq>s),
(list of supported <effect>s)
+QCFG: “roamservice”,
(list of supported <roammode>s),
(list of supported <effect>s)
+QCFG: “servicedomain”,
(list of supported <service>s),
(list of supported <effect>s)
+QCFG: “band”,
(list of supported <bandval>s),
(list of supported <ltebandval>s)
(list of supported <tdsbandval>s),(list of supported
<effect>s)
+QCFG: “hsdpacat”,
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 39 / 230
(list of supported <cat>s)
+QCFG: “hsupacat”,
(list of supported <cat>s)
+QCFG: “rrc”,
(list of supported <rrcr>s)
+QCFG: “sgsn”,
(list of supported <sgsnr>s)
+QCFG: “msc”,
(list of supported <mscr>s)
+QCFG: “PDP/DuplicateChk”,
(list of supported <enable>s)
+QCFG: "airplanecontrol",
(list of supported <airplanecontrol>s)
+QCFG: “TDSCSQ”,
(list of supported <value>s)
+QCFG: “apready”,
(list of supported <enable>s),
(list of supported <level>s),
(list of supported <interval>s)
+QCFG: "risignaltype",
(list of supported <risignatype>s)
+QCFG: "urc/ri/ring",
(list of supported <typeri>s),
(list of supported <pulseduration>s),
(list of supported <activeduration>s),
(list of supported <inactiveduration>s),
(list of supported <ringnodisturbing>s)
+QCFG: "urc/ri/smsincoming",
(list of supported <typeri>s),
(list of supported <pulseduration>s)
+QCFG: "urc/ri/other",
(list of supported <typeri>s),
(list of supported <pulseduration>s)
+QCFG: "usbid",
(list of supported <vendor_id>s),
(list of supported <product_id>s)
+QCFG: "ehrpd",
(list of supported <enable>s)
+QCFG: "tone/incoming",
(list of supported <enable>s)
OK
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 40 / 230
4.3.1. AT+QCFG="gprsattach" GPRS Attach Mode Configuration
AT+QCFG=“gprsattach” specifies the mode to attach GPRS when UE is powered on. This configuration
is valid only after the module is restarted.
Parameter
4.3.2. AT+QCFG="nwscanmode" Network Search Mode Configuration
AT+QCFG=“nwscanmode” specifies the mode of searching network. If <effect> is omitted, the
configuration will take effect immediately.
Reference
Quectel
AT+QCFG="gprsattach" GPRS Attach Mode Configuration
Write Command
AT+QCFG=“gprsattach”[,<attachmode
>]
Response
If configuration parameters are omitted
(+QCFG=“gprsattach”), return current configuration:
+QCFG: “gprsattach”,<attachmode>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<attachmode> Number format, the mode to attach GRPS when UE is powered on
0 Manual attach
1 Auto attach
AT+QCFG="nwscanmode" Network Search Mode Configuration
Write Command
AT+QCFG=“nwscanmode”[,<scanmod
e>[,<effect>]]
Response
If configuration parameters are omitted
(+QCFG=“nwscanmode”), return current configuration:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 41 / 230
Parameter
4.3.3. AT+QCFG="nwscanseq" Network Searching Sequence Configuration
AT+QCFG=“nwscanseq” specifies the sequence of searching network. This configuration takes effect
only after the module is restarted.
+QCFG: “nwscanmode”,<scanmode>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<scanmode> Number format, network search mode
0 AUTO
1 GSM only
2 WCDMA only
3 LTE only
4 TD-SCDMA only
5 UMTS only
6 CDMA only
7 HDR only
8 CDMA and EVDO only
<effect> Number format, when to take effect
0 Take effect after UE reboots
1 Take effect immediately
AT+QCFG="nwscanseq" Network Searching Sequence Configuration
Write Command
AT+QCFG=“nwscanseq”[,<scanseq>[,
<effect>]]
Response
If configuration parameters are omitted
(+QCFG=“nwscanseq”), return current configuration:
+QCFG: “nwscanseq”,<scanseq>
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 42 / 230
Parameter
1. The network mode in the network search sequence will be ignored when module doesn‟t support it.
2. The CDMA network will be searched after LTE/WCDMA/TD-SCDMA/GSM though it has not been
included in the sequence.
4.3.4. AT+QCFG="roamservice" Roam Service Configuration
AT+QCFG=“roamservice” is used to enable or disable the roam service. If <effect> is omitted, the
configuration will take effect immediately.
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<scanseq> Number format, network search sequence
(eg.: 04030201(LTE/WCDMA/TD-SCDMA/GSM))
00 Automatic
01 GSM
02 TD-SCDMA
03 WCDMA
04 LTE
05 CDMA
<effect> Number format, when to take effect
0 Take effect after UE reboots
1 Take effect immediately
AT+QCFG="roamservice" Roam Service Configuration
Write Command
AT+QCFG=“roamservice”[,<roammod
e>[,<effect>]]
Response
If configuration parameters are omitted
(+QCFG=“roamservice”), return current configuration:
+QCFG: “roamservice”,<roammode>
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 43 / 230
Parameter
4.3.5. AT+QCFG="servicedomain" Service Domain Configuration
AT+QCFG=“servicedomain” specifies the registered service domain. If <effect> is omitted, the
configuration will take effect immediately.
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<roammode> Number format, the mode of roam service
1 Disable roam service
2 Enable roam service
255 AUTO
<effect> Number format, when to take effect
0 Take effect after UE reboots
1 Take effect immediately
AT+QCFG="servicedomain" Service Domain Configuration
Write Command
AT+QCFG=“servicedomain”[,<service
>[,<effect>]]
Response
If configuration parameters are omitted
(+QCFG=“servicedomain”), return current configuration:
+QCFG: “servicedomain”,<service>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 44 / 230
Parameter
4.3.6. AT+QCFG="band" Band Configuration
AT+QCFG=“band” specifies the band of UE. If <effect> is omitted, the configuration will take effect
immediately.
Parameter
Maximum Response Time
300ms
Reference
Quectel
<service> Service domain of UE
0 CS only
1 PS only
2 CS & PS
<effect> Number format, when to take effect
0 Take effect after UE reboots
1 Take effect immediately
AT+QCFG="band" Band Configuration
Write Command
AT+QCFG=“band”[,<bandval>,<lteban
dval>,<tdsbandval>[,<effect>]]
Response
If configuration parameters are omitted
(+QCFG=“band”), return current configuration:
+QCFG: “band”,<bandval>,<ltebandval>,<tdsbandval>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<bandval> A hexadecimal value that specifies the GSM, WCDMA and CDMA frequency
band. If set <bandval> to 0 it means not to change GSM, WCDMA and
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 45 / 230
4.3.7. AT+QCFG="hsdpacat" HSDPA Category Configuration
AT+QCFG=“hsdpacat” specifies the HSDPA category. This configuration is valid only after the module is
frequency band.
(eg.:
00000013=00000001(GSM900)+00000002(GSM1800)+00000010(WCDMA
2100))
00000000 No change
00000001 GSM900
00000002 GSM1800
00000004 GSM850
00000008 GSM1900
00000010 WCDMA 2100
00000020 WCDMA 1900
00000040 WCDMA 850
00000080 WCDMA 900
00000100 WCDMA 800
00000200 WCDMA 1700
00000400 CDMA BC0
0000FFFF Any frequency band
<ltebandval> A hexadecimal value that specifies the LTE frequency band. If set <ltebandval>
to 0 or 0x40000000 it means not to change LTE frequency band. (eg.:
0x15=0x1( LTE BC1)+0x4( LTE BC3)+0x10( LTE BC5))
0x1 (CM_BAND_PREF_LTE_EUTRAN_BAND1) LTE BC1
0x4 (CM_BAND_PREF_LTE_EUTRAN_BAND3) LTE BC3
0x10 (CM_BAND_PREF_LTE_EUTRAN_BAND5) LTE BC5
0x40 (CM_BAND_PREF_LTE_EUTRAN_BAND7) LTE BC7
0x80 (CM_BAND_PREF_LTE_EUTRAN_BAND8) LTE BC8
0x80000(CM_BAND_PREF_LTE_EUTRAN_BAND20) LTE BC20
0x7FFFFFFFFFFFFFFF(CM_BAND_PREF_ANY) Any frequency band
<tdsbandval> A hexadecimal value that specifies the TDS-CDMA frequency band. If set
<tdsbandval> to 0 or 0x40000000 it means not to change TDS-CDMA
frequency band. (eg.: 0x21=0x1( TDS BCA) +0x20( TDS BCF))
0x1 (CM_BAND_PREF_TDS_BANDA) TDS BCA
0x2 (CM_BAND_PREF_TDS_BANDB) TDS BCB
0x4 (CM_BAND_PREF_TDS_BANDC) TDS BCC
0x8 (CM_BAND_PREF_TDS_BANDD) TDS BCD
0x10 (CM_BAND_PREF_TDS_BANDE) TDS BCE
0x20 (CM_BAND_PREF_TDS_BANDF) TDS BCF
<effect> When to take effect
0 Take effect after UE reboots
1 Take effect immediately
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 46 / 230
restarted.
Parameter
4.3.8. AT+QCFG="hsupacat" HSUPA Category Configuration
AT+QCFG=“hsupacat” specifies the HSUPA category. This configuration is valid only after the module is
restarted.
AT+QCFG="hsdpacat" HSDPA Category Configuration
Write Command
AT+QCFG=“hsdpacat”[,<cat>]
Response
If configuration parameters are omitted
(+QCFG=”hsdpacat”), return current configuration:
+QCFG: “hsdpacat”,<cat>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<cat> HSDPA category
6 Category 6
8 Category 8
10 Category 10
12 Category 12
14 Category 14
18 Category 18
20 Category 20
24 Category 24
AT+QCFG="hsupacat" HSUPA Category Configuration
Write Command
AT+QCFG=“hsupacat”[,<cat>]
Response
If configuration parameters are omitted
(+QCFG=“hsupacat”), return current configuration:
+QCFG: “hsupacat”,<cat>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 47 / 230
Parameter
4.3.9. AT+QCFG="rrc" RRC Release Version Configuration
AT+QCFG="rrc" specifies the RRC release version. This configuration is valid only after the module is
restarted.
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<cat> HSUPA category
5 Category 5
6 Category 6
AT+QCFG="rrc" RRC Release Version Configuration
Write Command
AT+QCFG=“rrc”[,<rrcr>]
Response
If configuration parameters are omitted
(+QCFG=“rrc”), return current configuration:
+QCFG: “rrc”,<rrcr>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 48 / 230
Parameter
4.3.10. AT+QCFG="sgsn" UE SGSN Release Version Configuration
AT+QCFG=“sgsn” specifies the UE SGSN release version. This configuration is valid only after the
module is restarted.
Parameter
<rrcr> RRC release version.
0 R99
1 R5
2 R6
3 R7
4 R8
AT+QCFG="sgsn" UE SGSN Release Version Configuration
Write Command
AT+QCFG=“sgsn”[,<sgsnr>]
Response
If configuration parameters are omitted
(+QCFG=“sgsn”), return current configuration:
+QCFG: “sgsn”,<sgsnr>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<sgsnr> SGSN release version
0 R97
1 R99
2 Dynamic
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 49 / 230
4.3.11. AT+QCFG="msc" UE MSC Release Version Configuration
AT+QCFG=“msc” specifies the UE MSC release version. This configuration is valid only after the module
is restarted.
Parameter
4.3.12. AT+QCFG="PDP/DuplicateChk" Establish Multi PDNs with the Same APN
AT+QCFG=“PDP/DuplicateChk” allows to establish multi PDNs with the same APN profile. The
configuration will take effect immediately.
AT+QCFG="msc" UE MSC Release Version Configuration
Write Command
AT+QCFG=“msc”[,<mscr>]
Response
If configuration parameters are omitted
(+QCFG=“msc”), return current configuration:
+QCFG: “msc”,<mscr>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<mscr> MSC release version
0 R97
1 R99
2 Dynamic
AT+QCFG="PDP/DuplicateChk" Establish Multi PDNs with the Same APN
Write Command
AT+QCFG=“PDP/DuplicateChk”[,<ena
ble>]
Response
If configuration parameters are omitted,
return current configuration:
+QCFG: “PDP/DuplicateChk”,<enable>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 50 / 230
Parameter
4.3.13. AT+QCFG="TDSCSQ" Set TDSCDMA RSSI Range
AT+QCFG=“TDSCSQ” sets RSSI range in TDSCDMA. The configuration will take effect immediately.
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<enable> 0 Refuse to establish multi PDNs with the same APN profile
1 Allow to establish multi PDNs with the same APN profile
AT+QCFG="TDSCSQ" Set TDSCDMA RSSI Range
Write Command
AT+QCFG=“TDSCSQ”[,<value>]
Response
If configuration parameters are omitted,
return current configuration:
+QCFG: “TDSCSQ”,<value>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 51 / 230
Parameter
This command is only valid in TDS-CDMA. AT+CSQ can be used to show the RSSI value, please get
RSSI details by AT+CSQ.
4.3.14. AT+QCFG="airplanecontrol" Enable/Disable Airplane Mode Detection
AT+QCFG="airplanecontrol" is used to enable or disable airplane mode detection.
When entering to or exiting from the airplane mode after the airplane mode is enabled, related URC will
be reported:
+QIND: "airplanestatus",<airplanestatus>
Both the W_DISABLE# pin and +CFUN command can control the module to enter into airplane mode.
When W_DISABLE# pin is pulled down, the module will enter into airplane mode no matter what the
status of +CFUN is; at the same time, +CFUN status cannot be switched.
When setting parameter of <airplanecontrol>, the parameter will be saved to NV. After enabling the
airplane mode detection functionality and the module is powered on, it will detect the W_DISABLE# pin
first. If the pin is in low level, module will enter into airplane mode instantly.
<value> 0 RSSI range is 0-31
1 RSSI range is 100-191
AT+ QCFG="airplanecontrol" Enable/Disable Airplane Mode Detection
Write Command
AT+QCFG="airplanecontrol"[,<airplan
econtrol>]
Response
If configuration parameters are omitted
(+QCFG="airplanecontrol"), return current configuration:
+QCFG:
"airplanecontrol",<airplanecontrol>,<airplanestatus>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 52 / 230
Parameter
The state of the W_DISABLE# pin may change the state of +CFUN.
Example
AT+QCFG="airplanecontrol",1 //Enable the airplane mode detection
OK
<Pull down W_DISABLE# pin>
+QIND: "airplanestatus",1 //Enter into airplane mode
AT+QCFG="airplanecontrol" //Query whether to enable airplane mode detection
+QCFG: "airplanecontrol",1,1 //Enable and enter to airplane mode
OK
<Pull up W_DISABLE# pin>
+QIND: "airplanestatus",0 //Exit from airplane mode
AT+QCFG="airplanecontrol"
+QCFG: "airplanecontrol",1,0 //Enable and exit from airplane mode
OK
4.3.15. AT+QCFG="apready" AP Ready Detection Configuration
AT+QCFG="apready" is used to set AP ready pin status detection. AP_READY (PIN2) is the default
indicator pin. MCU could change the level of indicator pin according to actual demands.
When URC is reported and the level of indicator pin is invalid, this module will store the reported URC and
periodically detect indicator pin‟s level until it turns to valid, and then stored URC will be reported. When
<airplanecontrol> Enable/disable the airplane mode detection. Enable this function and pull down
the W_DISABLE# pin, the UE will enter into the airplane mode. Pull up the
W_DISABLE# pin, the UE will enter into normal mode. The W_DISABLE# pin is
in high level when it is suspending.
0 Disable
1 Enable
<airplanestatus> Indicates the current status.
0 In normal mode
1 In airplane mode
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 53 / 230
the reported URC is stored, the RI pin status will still change according to your configuration.
Parameter
1. The configuration will be saved to NV automatically.
2. The maximum size to store URC is 15. Module will clear the earliest URC to store new one when
exceeds 15.
3. When AP ready is running, module only stores one “RING” during call.
4. If AP_READY is suspending, the default level depends on parameter <level>.
AT+QCFG="apready" AP Ready Detection Configuration
Write Command
AT+QCFG="apready"[,<enable>[,<level>[,<inter
val>]]]
Response
If configuration parameters are omitted
(+QCFG="apready"), return current configuration:
+QCFG:“apready”,<enable>,<level>,<interval>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<enable> Enable/disable AP ready status detection.
0 Disable AP ready status detection
1 Enable AP ready status detection
<level> Indicator pin‟s valid level. The parameter is only effective when indicator pin‟s detection
is running.
0 Low level
1 High level
<interval> Detection period, unit is ms. The parameter is only effective when indicator pin‟s
detection is running. When indicator pin‟s level is invalid and URC is reported, this
parameter will be used as detection interval to check indicator pin‟s level until it is valid.
The default value is 500ms.
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 54 / 230
Example
AT+QCFG="apready",1,0,800 //Set configuration
OK
AT+QCFG="apready"
+QCFG: “apready”,0,0,300 //Read configuration
OK
4.3.16. AT+QCFG="risignaltype" Ring indicator Signal Output Carrier
AT+QCFG="risignaltype" specifies the carrier of ring indicator signal output.
Parameter
AT+ QCFG="risignaltype" Ring indicator Signal Output Carrier
Write Command
AT+QCFG="risignaltype",[<risignatyp
e>]
Response
If configuration parameters are omitted
(+QCFG="urc/ri/other"), return current configuration:
+QCFG: "risignaltype",<risignatype>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
<risignatype> The carrier of ring indicator signal output
"respective" The ring indicator behaves on the port where URC is
presented.
For example, if URC is presented on UART port, it is
physical ring indicator. If URC is presented on USB port, it is
virtual ring indicator. +QURCCFG=”urcport” can get the
port on which URC is presented.
"physical" No matter which port URC is presented on, URC only
causes the behavior of physical ring indicator.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 55 / 230
4.3.17. AT+QCFG="urc/ri/ring" Ring indicator Behaviors When RING is Presented
AT+QCFG="urc/ri/ring", AT+QCFG="urc/ri/smsincoming" and AT+QCFG="urc/ri/other" control the
behavior of ring indicator when URC is reported. These configurations will be stored into NV automatically.
The ring indicator is active low. AT+QCFG="urc/ri/ring" specifies the behavior of ring indicator when
RING is presented to indicate an incoming call.
The sum of parameters <activeduration> and <inactiveduration> determines the interval time of
“RING” indications when a call is coming.
Parameter
AT+ QCFG="urc/ri/ring" Ring indicator Behaviors When RING is Presented
Write Command
AT+QCFG="urc/ri/ring"[,<typeri>[,<pul
seduration>[,<activeduration>[,<inacti
veduration>[,<ringnodisturbing>]]]]]
Response
If configuration parameters are omitted
(+QCFG="urc/ri/ring"), return current configuration:
+QCFG:
"urc/ri/ring",<typeri>,<pulseduration>,<activeduration>,
<inactiveduration>,<ringnodisturbing>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
<typeri> The behaviors of the ring indicator when URCs are presented.
"off" No change. Ring indicator keeps inactive.
"pulse" Pulse. Pulse width determined by <pulseduration>
"always" Change to active state. You may restore to inactive state by
+QRIR
"auto" When “RING” is presented to indicate an incoming call, ring
indicator changes to and keeps as active state. When ring of
the incoming call ends, either answering or hanging up the
incoming call, ring indicator will change to inactive state.
"wave" When “RING” is presented to indicate an incoming call. The
ring indicator outputs a square wave. Both <activeduration>
and <inactiveduration> are used to set parameters of the
square wave. When the ring of incoming call ends, either
answering or hanging up the incoming call, ring indicator will
change to inactive state.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 56 / 230
4.3.18. AT+QCFG="urc/ri/smsincoming" Ring indicator Behaviors When Incoming
SMS URCs are Presented
AT+QCFG="urc/ri/smsincoming" specifies the behavior of ring indicator when related incoming
message URCs are presented. Related incoming message URCs list: +CMTI, +CMT, +CDS, +CBM.
<pulseduration> Set the width of pulse. Value ranges from 1 to 2000ms and the default is
120ms. This parameter is only meaningful when <typeri> is “pulse”. If this
parameter is not needed, you can set it as null.
<activeduration> Set the active duration of the square wave. Value ranges from 1 to 10000ms
and the default is 1000ms. This parameter is only meaningful when <typeri>
is “wave”.
<inactiveduration> Set the inactive duration of the square wave. Value ranges from 1 to
10000ms and the default is 5000ms. This parameter is only meaningful when
<typeri> is “wave”.
<ringnodisturbing> Set whether the ring indicator behavior could be disturbed. This parameter is
only meaningful when <typeri> is configured to “auto” or “wave”. For
example, when <typeri> is configured to “wave”, if you require that the
square wave not to be disturbed by other URCs (including related SMS
URCs), you should set <ringnodisturbing> to "on".
"off" It can be disturbed by other URCs which the behavior of ring
line is caused by an incoming call ringing.
"on" It cannot be disturbed by other URCs which the behavior of ring
line is caused by an incoming call ringing.
AT+QCFG="urc/ri/smsincoming" Ring indicator Behaviors When Incoming SMS
URCs are Presented
Write Command
AT+QCFG="urc/ri/smsincoming"[,<typ
eri>[,<pulseduration>]]
Response
If configuration parameters are omitted
(+QCFG="urc/ri/smsincoming"), return current
configuration:
+QCFG: "urc/ri/smsincoming",<typeri>,<pulseduration>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 57 / 230
Parameter
4.3.19. AT+QCFG="urc/ri/other" Ring indicator Behaviors When Other URCs are
Presented
AT+QCFG="urc/ri/other" specifies the behavior of ring indicator when other URCs are presented.
Parameter
<typeri> The behaviors of the ring indicator when URC are presented.
"off" No change. Ring indicator keeps inactive.
"pulse" Pulse. Pulse width is determined by <pulseduration>
"always" Change to active state. You should restore to inactive state by
+QRIR
<pulseduration> Set the width of pulse. Value ranges from 1 to 2000ms, and the default is
120ms. This parameter is only valid when <typeri> is “pulse”.
AT+QCFG="urc/ri/other" Ring indicator Behaviors when Other URCs are Presented
Write Command
AT+QCFG="urc/ri/other"[,<typeri>[,<p
ulseduration>]]
Response
If configuration parameters are omitted
(+QCFG="urc/ri/other"), return current configuration:
+QCFG: "urc/ri/other",<typeri>,<pulseduration>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
<typeri> The behaviors of the ring indicator when URCs are presented.
"off" No change. Ring indicator keeps inactive.
"pulse" Pulse. Pulse width is determined by <pulseduration>
<pulseduration> Set the width of pulse. Value ranges from 1 to 2000ms and the default is 120ms.
This parameter is valid only when <typeri> is “pulse”.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 58 / 230
4.3.20. AT+QCFG="usbid" Set USB Vendor ID and Product ID
AT+QCFG="usbid" specifies the USB vendor ID and product ID.
Parameter
4.3.21. AT+QCFG="ehrpd" Configure the EHRPD Mode
AT+QCFG="ehrpd" configures the EHRPD (Evolved High Rate Package Data) Mode.
AT+QCFG="usbid" Set USB Vendor ID and Product ID
Write Command
AT+QCFG="usbid"[,<vendor_id>[,<pro
duct_id>]]
Response
If configuration parameters are omitted
(+QCFG="usbid"), return current configuration:
+QCFG: <vendor_id>,<product_id>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
<vendor_id> Integer type.
<product_id> Integer type.
AT+ QCFG="ehrpd" Configure the EHRPD Mode
Write Command
AT+QCFG="ehrpd"[,<enable>]
Response
If configuration parameters are omitted
(+QCFG="ehrpd "), return current configuration:
+QCFG: <ehrpd>,<enable>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 59 / 230
Parameter
4.3.22. AT+QCFG="tone/incoming" Enable/Disable Ringing Tone
AT+QCFG="tone/incoming" enables or disables ringing tone.
Parameter
<enable> 2 Disable
4 Enable
AT+ QCFG="tone/incoming" Enable/Disable Ringing Tone
Write Command
AT+QCFG="tone/incoming"[,<enable>
]
Response
If configuration parameters are omitted
(+QCFG="tone/incoming"), return current configuration:
+QCFG: <tone/incoming>,<enable>
OK
If configuration parameters are entered:
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
<enable> 0 Disable
1 Enable
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 60 / 230
5 SIM Related Commands
5.1. AT+CIMI Request International Mobile Subscriber Identity (IMSI)
AT+CIMI requests the International Mobile Subscriber Identity (IMSI) which is intended to permit the TE to
identify the individual SIM card or active application in the UICC (GSM or USIM) that is attached to MT.
Parameter
Example
AT+CIMI
460023210226023 //Query IMSI number of SIM which is attached to ME
OK
AT+CIMI Request International Mobile Subscriber Identity (IMSI)
Test Command
AT+CIMI=?
Response
OK
Execution Command
AT+CIMI
Response
TA returns <IMSI> for identifying the individual SIM which is
attached to ME.
<IMSI>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<IMSI> International Mobile Subscriber Identity (string without double quotes)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 61 / 230
5.2. AT+CLCK Facility Lock
AT+CLCK is used to lock, unlock or interrogate a MT or a network facility <fac>. The command can be
aborted when network facilities are being set or interrogated. The factory default password of PF, PN, PU,
PP and PC lock is “12341234”.
Parameter
AT+CLCK Facility Lock
Test Command
AT+CLCK=?
Response
+CLCK: (list of supported <fac>s)
OK
Write Command
AT+CLCK=<fac>,<mode>[,<passwd>[
,<class>]]
Response
This command is used to lock, unlock or interrogate a ME or a
network facility <fac>. Password is normally needed to do
such actions. When querying the status of a network service
(<mode>=2) the response line for „not active‟ case
(<status>=0) should be returned only if service is not active
for any <class>.
If <mode>≠2 and command is successful:
OK
If <mode>=2 and command is successful:
+CLCK: <status>[,<class>]
[+CLCK: <status>[, <class>]]
[…]
OK
Maximum Response Time
5s
Reference
3GPP TS 27.007
<fac> “SC” SIM (lock SIM/UICC card installed in the currently selected card slot) (SIM/UICC
asks password in MT power-up and when this lock command issued).
“AO” BAOC (Barr All Outgoing Calls) (refer to 3GPP TS 22.088 clause 1).
“OI” BOIC (Barr Outgoing International Calls) (refer to 3GPP TS 22.088 clause 1).
“OX” BOIC-exHC (Barr Outgoing International Calls except to Home Country) (refer to
3GPP TS 22.088 clause 1).
“AI” BAIC (Barr All Incoming Calls) (refer to 3GPP TS 22.088 clause 2).
“IR” BIC-Roam (Barr Incoming Calls when Roaming outside the home country) (refer
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 62 / 230
Example
AT+CLCK=“SC”, 2
+CLCK: 0 //Query the status of SIM card lock, 0-unlock
OK
AT+CLCK=“SC”,1,“1234” //Lock SIM card, the password is 1234
OK
AT+CLCK=“SC”,2
+CLCK: 1 //Query the status of SIM card lock, 1-lock
OK
AT+CLCK=“SC”,0,“1234” //Unlock SIM card
OK
to 3GPP TS 22.088 clause 2).
“AB” All Barring services (refer to 3GPP TS 22.030) (applicable only for <mode>=0).
“AG” All outgoing barring services (refer to 3GPP TS 22.030) (applicable only for
<mode>=0).
“AC” All incoming barring services (refer to 3GPP TS 22.030) (applicable only for
<mode>=0).
“FD” SIM card or active application in the UICC (GSM or USIM) fixed dialing memory
feature (if PIN2 authentication has not been done during the current session,
PIN2 is required as <passwd>).
“PF” Lock Phone to the very first inserted SIM/UICC card (also referred in the present
document as PH-FSIM) (MT asks password when other than the first SIM/UICC
card is inserted).
“PN” Network Personalization (refer to 3GPP TS 22.022)
“PU” Network subset Personalization (refer to 3GPP TS 22.022)
“PP” Service Provider Personalization (refer to 3GPP TS 22.022)
“PC” Corporate Personalization (refer to 3GPP TS 22.022)
<mode> 0 Unlock
1 Lock
2 Query status
<passwd> Password
<class> 1 Voice
2 Data
4 FAX
7 All telephony except SMS (Default)
8 Short message service
16 Data circuit sync
32 Data circuit async
<status> 0 Off
1 On
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 63 / 230
5.3. AT+CPIN Enter PIN
AT+CPIN is used to enter a password or query whether or not module requires a password which is
necessary before it can be operated (SIM PIN, SIM PUK, PH-SIM PIN, etc.).
Parameter
AT+CPIN Enter PIN
Test Command
AT+CPIN=?
Response
OK
Read Command
AT+CPIN?
Response
TA returns an alphanumeric string indicating whether or not
some password is required.
+CPIN: <code>
OK
Write Command
AT+CPIN=<pin>[,<new pin>]
Response
TA stores a password which is necessary before it can be
operated (SIM PIN, SIM PUK, etc.). If the PIN is to be entered
twice, the TA shall automatically repeat the PIN. If no PIN
request is pending, no action is taken and an error message,
+CME ERROR, is returned to TE.
If the PIN required is SIM PUK or SIM PUK2, the second pin
is required. This second pin, <new pin>, is used to replace
the old pin in the SIM.
OK
Maximum Response Time
5s
Reference
3GPP TS 27.007
<code> READY MT is not pending for any password
SIM PIN MT is waiting for SIM PIN to be given
SIM PUK MT is waiting for SIM PUK to be given
SIM PIN2 MT is waiting for SIM PIN2 to be given
SIM PUK2 MT is waiting for SIM PUK2 to be given
PH-NET PIN MT is waiting for network personalization password to be given
PH-NET PUK MT is waiting for network personalization unblocking password
to be given
PH-NETSUB PIN MT is waiting for network subset personalization password to be
given
PH-NETSUB PUK MT is waiting for network subset personalization unblocking
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 64 / 230
Example
//Enter PIN
AT+CPIN?
+CPIN: SIM PIN //Query PIN code is locked
OK
AT+CPIN=1234 //Enter PIN
OK
+CPIN: READY
AT+CPIN? //PIN has already been entered
+CPIN: READY
OK
//Enter PUK and PIN
AT+CPIN?
+CPIN: SIM PUK //Query PUK code is locked
OK
AT+CPIN=”26601934”,”1234” //Enter PUK and new PIN password
OK
+CPIN: READY
AT+CPIN?
+CPIN: READY //PUK has already been entered
OK
password to be given
PH-SP PIN MT is waiting for service provider personalization password to
be given
PH-SP PUK MT is waiting for service provider personalization unblocking
password to be given
PH-CORP PIN MT is waiting for corporate personalization password to be
given
PH-CORP PUK MT is waiting for corporate personalization unblocking
password to be given
<pin> Password (string type). If the requested password was a PUK, such as SIM PUK1 or
PH-FSIM PUK or another password, then <pin> must be followed by <new pin>.
<new pin> New password (string type) if the requested code was a PUK.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 65 / 230
5.4. AT+CPWD Change Password
AT+CPWD sets a new password for the facility lock function defined by command Facility Lock +CLCK.
Parameter
AT+CPWD Change Password
Test Command
AT+CPWD=?
Response
TA returns a list of pairs which present the available facilities
and the maximum length of their password.
+CPWD: (list of supported <fac>s),(<pwdlength>s)
OK
Write Command
AT+CPWD=<fac>,<oldpwd>,<newpwd
>
Response
TA sets a new password for the facility lock function.
OK
Maximum Response Time
5s
Reference
3GPP TS 27.007
<fac> “SC” SIM (lock SIM/UICC card) (SIM/UICC asks password in MT power-up and when
this lock command issued)
“AO” BAOC (Barr All Outgoing Calls, refer to 3GPP TS 22.088 clause 1)
“OI” BOIC (Barr Outgoing International Calls, refer to 3GPP TS 22.088 clause 1)
“OX” BOIC-exHC (Barr Outgoing International Calls except to Home Country, refer to
3GPP TS 22.088 clause 1)
“AI” BAIC (Barr All Incoming Calls, refer to 3GPP TS 22.088 clause 2)
“IR” BIC-Roam (Barr Incoming Calls when Roaming outside the home country, refer
to 3GPP TS 22.088 clause 2)
“AB” All barring services (refer to 3GPP TS 22.030, applicable only for <mode>=0)
“AG” All outgoing barring services (refer to 3GPP TS 22.030, applicable only for
<mode>=0)
“AC All incoming barring services (refer to 3GPP TS 22.030, applicable only for
<mode>=0)
“P2” SIM PIN2
<pwdlength> Integer type, max length of password
<oldpwd> Password specified for the facility from the user interface or with command.
<newpwd> New password
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 66 / 230
Example
AT+CPIN?
+CPIN: READY
OK
AT+CPWD=“SC”,“1234”,“4321” //Change SIM card password to “4321”
OK
//Restart module or re-activate the SIM card
AT+CPIN? //Query PIN code is locked
+CPIN: SIM PIN
OK
AT+CPIN=“4321” //PIN must be entered to define a new password “4321”
OK
+CPIN: READY
5.5. AT+CSIM Generic SIM Access
AT+CSIM allows a direct control of the SIM that is installed in the currently selected card slot by a distant
application on the TE. The TE shall then keep the processing of SIM information within the frame
specified by GSM/UMTS.
AT+CSIM Generic SIM Access
Test Command
AT+CSIM=?
Response
OK
Write Command
AT+CSIM=<length>,<command>
Response
+CSIM: <length>,<response>
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 67 / 230
Parameter
5.6. AT+CRSM Restricted SIM Access
AT+CRSM offers easy and limited access to the SIM database. It transmits the SIM <command> and its
required parameters to the MT.
Parameter
<length> Integer type. Length of <command> or <response> string.
<command> Command transferred by the MT to the SIM in the format as described in
3GPP TS 51.011.
<response> Response to the command transferred by the SIM to the MT in the format as
described in 3GPP TS 51.011.
AT+CRSM Restricted SIM Access
Test Command
AT+CRSM=?
Response
OK
Write Command
AT+CRSM=<command>[,<fileld>[,<P1
>,<P2>,<P3>[,<data>][,<pathld>]]]
Response
+CRSM: <sw1>,<sw2>[,<response>]
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<command> USIM command number
176 READ BINARY
178 READ RECORD
192 GET RESPONSE
214 UPDATE BINARY
220 UPDATE RECORD
242 STATUS
<fileId> Integer type; identifier for an elementary data file on USIM, if used by
<command>.
<P1>, <P2>, <P3> Integer type; parameters transferred by the MT to the SIM. These parameters
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 68 / 230
5.7. AT+QCCID Show ICCID
AT+QCCID returns the ICCID (Integrated Circuit Card Identifier) number of the SIM card.
Example
AT+QCCID //Query ICCID of the SIM card
+QCCID: 89860025128306012474
OK
are mandatory for every command, except GET RESPONSE and STATUS.
The values are described in 3GPP TS 51.011.
<data> Information which shall be written to the SIM (hexadecimal character format;
refer to +CSCS).
<pathId> Contains the directory path of an elementary file on a UICC in hexadecimal
format.
<sw1>, <sw2> Integer type; information from the SIM about the execution of the actual
command. These parameters are delivered to the TE in both cases, on
successful or failed execution of the command.
<response> Response of a successful completion of the command previously issued
(hexadecimal character format; refer to +CSCS). STATUS and GET
RESPONSE return data, which gives information about the current
elementary data field. This information includes the type of file and its size
(refer to 3GPP TS 51.011). After READ BINARY, READ RECORD or
RETRIEVE DATA command the requested data will be returned. <response>
is not returned after a successful UPDATE BINARY, UPDATE RECORD or
SET DATA command.
AT+QCCID Show ICCID
Test Command
AT+QCCID=?
Response
OK
Execution Command
AT+QCCID
Response
+QCCID: <iccid>
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 69 / 230
5.8. AT+QPINC Display PIN Remainder Counter
AT+QPINC can query number of attempts left to enter the password of SIM PIN/PUK.
Parameter
5.9. AT+QSIMDET SIM Card Detection
AT+QSIMDET enables SIM/USIM card hotswap function. SIM/USIM card is detected by GPIO interrupt.
You should also set the level of SIM/USIM detecting pin when the SIM card is inserted. This command
can be saved by AT&W.
AT+ QPINC Display PIN Remainder Counter
Test Command
AT+QPINC=?
Response
+QPINC: (list of supported <facility>s)
OK
Read Command
AT+QPINC?
Response
+QPINC: "SC", <pincounter>,<pukcounter>
+QPINC: "P2", <pincounter>,<pukcounter>
OK
Write Command
AT+QPINC=<facility>
Response
+QPINC: <facility>,<pincounter>,<pukcounter>
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<facility> “SC” SIM PIN
“P2” SIM PIN2
<pincounter> Number of attempts left to enter the password of PIN
<pukcounter> Number of attempts left to enter the password of PUK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 70 / 230
Parameter
Hotswap function is invalid if the configured value of <insert_level> is inconsistent with hardware design.
Example
AT+QSIMDET=1,0 //If SIM/USIM detection pin level is low when SIM/USIM card inserted
OK
<Remove SIM/USIM card>
+CPIN: NOT READY
<Insert SIM/USIM card>
+CPIN: READY //If PIN1 of the SIM/USIM card is unlocked
AT+QSIMDET SIM Card Detection
Test Command
AT+QSIMDET=?
Response
+QSIMDET: (list of supported <enable>s),(list of supported
<insert_level>s)
OK
Read Command
AT+QSIMDET?
Response
+QSIMDET: <enable>,<insert_level>
OK
Write Command
AT+QSIMDET=<enable>,<insert_level
>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
<enable> Switch on or off detecting SIM/USIM card
0 Off
1 On
<insert_level> The level of SIM detection pin when a SIM card is inserted
0 Low level
1 High level
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 71 / 230
5.10. AT+QSIMSTAT SIM Inserted Status Report
AT+QSIMSTAT can query SIM/USIM inserted status or enable SIM/USIM inserted status report. The
configuration of this command can be saved by AT&W.
Parameter
Example
AT+QSIMSTAT? //Query SIM/USIM inserted status
+QSIMSTAT: 0,1
OK
AT+QSIMDET=1,0
OK
AT+QSIMSTAT=1 //Enable SIM/USIM inserted status report
AT+QSIMSTAT SIM Inserted Status Report
Test Command
AT+QSIMSTAT=?
Response
+QSIMSTAT: (list of supported <enable>s)
OK
Read Command
AT+QSIMSTAT?
Response
+QSIMSTAT: <enable>,<inserted_status>
OK
Write Command
AT+QSIMSTAT=<enable>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
<enable> Enable or disable SIM/USIM inserted status report. If it is enabled, when SIM/USIM
card removes or inserts, the URC: +QSIMSTAT: <enable>,<inserted_status> will
be reported.
0 Disable
1 Enable
<inserted_status> SIM/USIM is inserted or removed. This argument is not allowed to be set.
0 Removed
1 Inserted
2 Unknown, before SIM initialization
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 72 / 230
OK
AT+QSIMSTAT?
+QSIMSTAT: 1,1
OK
<Remove SIM/USIM card>
+QSIMSTAT : 1,0 //Report of SIM/USIM inserted status, removed
+CPIN: NOT READY
AT+QSIMSTAT?
+QSIMSTAT: 1,0
OK
<Insert SIM/USIM card>
+QSIMSTAT : 1,1 //Report of SIM/USIM inserted status, inserted
+CPIN: READY
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 73 / 230
6 Network Service Commands
6.1. AT+COPS Operator Selection
AT+COPS returns the current operators and their status, and allows to set automatic or manual network
operator selection.
AT+COPS Operator Selection
Test Command
AT+COPS=?
Response
TA returns a set of five parameters, and each represents an
operator presenting in the network. Any of the formats may be
unavailable and should then be an empty field. The list of
operators shall be in the order of: home network, networks
referenced in SIM and other networks.
+COPS: (list of supported<stat>, long alphanumeric <oper>,
short alphanumeric <oper>, numeric <oper>s)[,< Act>])s]
[,,(list of supported <mode>s),(list of supported <format>s )]
OK
If error is related to ME functionality:
+CME ERROR: <err>
Read Command
AT+COPS?
Response
TA returns the current mode and the currently selected
operator. If no operator is selected, <format>, <oper> and
<Act> are omitted.
+COPS: <mode>[,<format>[,<oper>][,<Act>]]
OK
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+COPS=<mode>[,<format>[,<oper
>[,<Act>]]]
Response
TA forces an attempt to select and register to a GSM/UMTS
network operator. If the selected operator is not available, no
other operator shall be selected (except <mode>=4). The
name format of selected operator shall apply to further read
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 74 / 230
Parameter
Example
AT+COPS=? //List all current network operators
+COPS:
commands (+COPS?).
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
180s, determined by network.
Reference
3GPP TS 27.007
<stat> 0 Unknown
1 Operator available
2 Operator current
3 Operator forbidden
<oper> Operator in format as per <mode>
<mode> 0 Automatic mode; <oper> field is ignored
1 Manual operator selection; <oper> field shall be presented and <Act> optionally
2 Manual deregister from network
3 Set only <format> (for read Command +COPS?); no need to register/deregister
(<oper> and <Act> fields are ignored); this value is not shown in read command
response
4 Manual/automatic operator selection; <oper> field shall be presented; if manual
selection fails, automatic mode (<mode>=0) is entered.
<format> 0 Long format alphanumeric <oper>; can be up to 16 characters long
1 Short format alphanumeric <oper>
2 Numeric <oper>; GSM location area identification number
<Act> Access technology selected. Values 3, 4, 5, 6 occur only in read command response while
MS is in data service state and are not intended for the AT+COPS write command.
0 GSM
2 UTRAN
3 GSM W/EGPRS
4 UTRAN W/HSDPA
5 UTRAN W/HSUPA
6 UTRAN W/HSDPA and HSUPA
7 E-UTRAN
100 CDMA
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 75 / 230
(1,"CHN-UNICOM","UNICOM","46001",2),(1,"CHN-UNICOM","UNICOM","46001",0),(2,"CHN-UNICO
M","UNICOM","46001",7),(1,"46011","46011","46011",7),(3,"CHINA
MOBILE","CMCC","46000",0),,(0,1,2,3,4),(0,1,2)
OK
AT+COPS? //Query the currently selected network operator
+COPS: 0,0,“CHN-UNICOM”,0
OK
6.2. AT+CREG Network Registration
AT+CREG returns the network registration status. The write command sets whether or not to present
URC.
AT+CREG Network Registration
Test Command
AT+CREG=?
Response
+CREG: (list of supported <n>s)
OK
Read Command
AT+CREG?
Response
In Non-CDMA mode:
TA returns the status of result code presentation and an
integer <stat> which shows whether the network has
currently indicated the registration of the ME. Location
information elements <lac> and <ci> are returned only when
<n>=2 and ME is registered in the network.
+CREG: <n>,<stat>[,<lac>,<ci>[,<Act>]]
OK
If error is related to ME functionality:
+CME ERROR: <err>
In CDMA mode:
TA returns the status of result code presentation and an
integer <stat> which shows whether the network has
currently indicated the registration of the ME. Location
information elements <sid> and <nid_bid> are returned only
when <n>=2 and ME is registered in the network.
+CREG: <n>,<stat>[,<sid>,<nid_bid>,<Act>]
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 76 / 230
Parameter
OK
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CREG[=<n>]
Response
TA controls the presentation of an unsolicited result code
+CREG: <stat> when <n>=1 and there is a change in the ME
network registration status.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
In Non-CDMA mode:
<n> 0 Disable network registration unsolicited result code
1 Enable network registration unsolicited result code +CREG: <stat>
2 Enable network registration unsolicited result code with location information
+CREG: <stat>[,<lac>,<ci>[,<Act>]]
<stat> 0 Not registered, ME is not currently searching a new operator to register to
1 Registered, home network
2 Not registered, but ME is currently searching a new operator to register to
3 Registration denied
4 Unknown
5 Registered, roaming
<lac> String type, two bytes location area code in hexadecimal format
<ci> String type, 16 bit (GSM) or 28 bit (UMTS/LTE) cell ID in hexadecimal format
<Act> Access technology selected
0 GSM
2 UTRAN
3 GSM W/EGPRS
4 UTRAN W/HSDPA
5 UTRAN W/HSUPA
6 UTRAN W/HSDPA and HSUPA
7 E-UTRAN
In CDMA mode:
<n> 0 Disable network registration unsolicited result code
1 Enable network registration unsolicited result code +CREG: <stat>
2 Enable network registration unsolicited result code with location information
+CREG: <stat>[,<sid>,<nid_bid>,<Act>]
<stat> 0 Not registered, ME is not currently searching a new operator to register to
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 77 / 230
Example
//In Non-CDMA mode
AT+CREG=1
OK
+CREG: 1 //URC reports that ME has registered
AT+CREG=2 //Activates extended URC mode
OK
+CREG: 1,“D509”,”80D413D”,2 //URC reports that operator has found location area code
and cell ID
//In CDMA mode
AT+CREG=1
OK
+CREG: 1 //URC reports that ME has registered
AT+CREG=2 //Activates extended URC mode
OK
AT+CREG?
+CREG: 2,1,“3747”,”A23C2”,100 //Query the system ID, network ID and BTS ID of CDMA
network
OK
6.3. AT+CSQ Signal Quality Report
AT+CSQ indicates the received signal strength <rssi> and the channel bit error rate <ber>.
1 Registered, home network
<sid> String type, two bytes system ID in hexadecimal format
<nid_bid> String type, high 16 bit(network ID) and low 16bit(BTS ID) in hexadecimal format
<Act> Access technology selected
100 CDMA
AT+CSQ Signal Quality Report
Test Command
AT+CSQ=?
Response
+CSQ: (list of supported <rssi>s),(list of supported <ber>s)
OK
Execution Command
AT+CSQ
Response
+CSQ: <rssi>,<ber>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 78 / 230
Parameter
After using network related commands such as +CCWA and +CCFC, users are advised to wait for 3s
before entering AT+CSQ. This is recommended to ensure that any network access required for the
preceding command has finished.
Example
AT+CSQ=?
+CSQ: (0-31,99),(0-7,99)
OK
AT+CSQ
+CSQ: 28,99 //Query the current signal strength indication is 28 and
channel bit error rate is 99
OK
+CME ERROR: <err>
Execution Command returns received signal strength
indication <rssi> and channel bit error rate <ber> from the
ME. Test Command returns values supported by the TA.
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<rssi> 0 -113dBm or less
1 -111dBm
2...30 -109... -53dBm
31 -51dBm or greater
99 Not known or not detectable
100 -116dBm or less
101 -115dBm
102...190 -114...-26dBm
191 -25dBm or greater
199 Not known or not detectable
100~199 Extended to be used in TDS-CDMA indicating received signal code
power (RSCP)
<ber> Channel bit error rate (in percent)
0...7 As RXQUAL values in the table in 3GPP TS 45.008 subclause 8.2.4
99 Not known or not detectable
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 79 / 230
OK
6.4. AT+CPOL Preferred Operator List
AT+CPOL edits and queries the list of the preferred operators.
Parameter
AT+CPOL Preferred Operator List
Test Command
AT+CPOL=?
Response
+CPOL: (list of supported <index>s),(list of supported
<format>s)
OK
Read Command
AT+CPOL?
Response
Query the list of the preferred operators:
+CPOL:
<index>,<format>,<oper>[,<GSM>,<GSM_compact,<UTR
AN>,<E-UTRAN>]
<index>,<format>,<oper>[,<GSM>,<GSM_compact,<UTR
AN>,<E-UTRAN>]
[…]
OK
Write Command
AT+CPOL=<index>[,<format>[,<oper>
[<GSM>,<GSM_compact>,<UTRAN>,
<E-UTRAN>]]]
Response
Edit the list of the preferred operators:
OK
ERROR
If the <index> is given but the <operator> is left out, the
entry is deleted.
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<index> Integer type; the order number of operator in the SIM/USIM preferred operator list
<format> 0 Long format alphanumeric <oper>
1 Short format alphanumeric <oper>
2 Numeric <oper>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 80 / 230
The Access Technology selection parameters <GSM>, <GSM_compact>, <UTRAN> and <E-UTRAN>
are required for SIM cards or UICC‟s containing PLMN selector with Access Technology.
6.5. AT+COPN Read Operator Names
The AT+COPN command returns the list of operator names from the ME. Each operator code
<numericn> that has an alphanumeric equivalent <alphan> in the ME memory is returned.
<oper> String type; <format> indicates if the format is alphanumeric or numeric (see +COPS)
<GSM> GSM access technology
0 Access technology is not selected
1 Access technology is selected
<GSM_compact> GSM compact access technology
0 Access technology is not selected
1 Access technology is selected
<UTRAN> UTRAN access technology
0 Access technology is not selected
1 Access technology is selected
<E-UTRAN> E-UTRAN access technology
0 Access technology is not selected
1 Access technology is selected
AT+COPN Read Operator Names
Test Command
AT+COPN=?
Response
OK
Execution Command
AT+COPN
Response
+COPN: <numeric1>,<alpha1>
[+COPN: <numeric2>,<alpha2>
[…]]
OK
+CME ERROR: <err>
Maximum Response Time
Depends on the number of operator names.
Reference
3GPP TS 27.007
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 81 / 230
Parameter
6.6. AT+CTZU Automatic Time Zone Update
Set command enables and disables automatic time zone update via NITZ. The configuration is stored to
NV automatically.
Parameter
<onoff> Integer type, indicates the mode of automatic time zone update
0 Disable automatic time zone update via NITZ
1 Enable automatic time zone update via NITZ
Example
AT+CTZU?
+CTZU: 0
OK
AT+CTZU=?
+CTZU: (0,1)
<numericn> String type; operator in numeric format (see +COPS)
<alphan> String type; operator in long alphanumeric format (see +COPS)
AT+CTZU Automatic Time Zone Update
Test Command
AT+CTZU=?
Response
+CTZU: (list of supported <onoff>s)
OK
Read Command
AT+CTZU?
Response
+CTZU: <onoff>
OK
Write Command
AT+CTZU=<onoff>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 82 / 230
OK
AT+CTZU=1
OK
AT+CTZU?
+CTZU: 1
OK
6.7. AT+CTZR Time Zone Reporting
This command controls the time zone reporting of changed event. If reporting is enabled the MT returns
the unsolicited result code +CTZV: <tz>or +CTZE: <tz>,<dst>,<time> whenever the time zone is
changed. The configuration is stored to NV automatically.
Parameter
AT+CTZR Time Zone Reporting
Test Command
AT+CTZR=?
Response
+CTZR: (list of supported <reporting>s)
OK
Read Command
AT+CTZR?
Response
+CTZR: <reporting>
OK
Write Command
AT+CTZR=<reporting>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<reporting> Integer type, indicates the mode of time zone reporting
0 Disable time zone reporting of changed event
1 Enable time zone reporting of changed event by unsolicited result code
+CTZV: <tz>
2 Enable extended time zone reporting by unsolicited result code
+CTZE: <tz>,<dst>,<time>
<tz> String type, represents the sum of the local time zone (difference between the local
time and GMT is expressed in quarters of an hour) plus daylight saving time. The
format is “±zz”, expressed as a fixed width, two digit integer with the range -48 ... +56.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 83 / 230
Example
AT+CTZR=2
OK
AT+CTZR?
+CTZR: 2
OK
+CTZE: “+32”,0,“2013/08/23,06:51:13” //<reporting> is 2
6.8. AT+QLTS Obtain the Latest Network Time Synchronization
AT+QLTS is used to obtain the latest network time synchronization.
To maintain a fixed width, numbers in the range -9 ... +9 are expressed with a leading
zero, e.g. “-09”, “+00” and “+09”.
<dst> Integer type, indicates whether <tz> includes daylight savings adjustment
0 <tz> includes no adjustment for Daylight Saving Time
1 <tz> includes +1 hour (equals 4 quarters in <tz>) adjustment for daylight saving
time
2 <tz> includes +2 hours (equals 8 quarters in <tz>) adjustment for daylight saving
time
<time> String type, represents the local time. The format is “YYYY/MM/DD,hh:mm:ss”,
expressed as integers representing year (YYYY), month (MM), date (DD), hour (hh),
minute (mm) and second (ss). This parameter can be provided by the network when
delivering time zone information and will be presented in the unsolicited result code of
extended time zone reporting if provided by the network.
AT+ QLTS Obtain the Latest Network Time Synchronization
Test Command
AT+QLTS=?
Response
OK
Execution Command
AT+QLTS
Response
Execution Command returns latest time for Network
synchronization:
+QLTS: <time>,<ds>
OK
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 84 / 230
Parameter
Example
AT+QLTS
+QLTS: "13/08/23,06:51:13+32,0"
OK
6.9. AT+QNWINFO Query Network Information
AT+QNWINFO indicates the selected <Act> of Access technology, the operator <oper> and the band
<band>.
Parameter
<time> String type. The Format is "YY/MM/DD,hh:mm:ss+zz", which indicates the year (two last
digits), month, day, hour, minutes, seconds and time zone (indicates the difference,
expressed in quarters of an hour, between the local time and GMT; range -48...+56). E.g.
6th of May 2004, 22:10:00 GMT+2 hours equals to”04/05/06,22:10:00+08”
<ds> Daylight saving time. When it is zero, the format will be "2004/05/06,22:10:00+08,0"
AT+QNWINFO Query Network Information
Test Command
AT+QNWINFO=?
Response
OK
Execution Command
AT+QNWINFO
Response
+QNWINFO: <Act>,<oper>,<band>,<channel>
OK
Maximum Response Time
300ms
Reference
Quectel
<Act> String type; Access technology selected
“NONE”
“CDMA1X”
“CDMA1X AND HDR”
“CDMA1X AND EHRPD”
“HDR”
“HDR-EHRPD”
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 85 / 230
“GSM”
“GPRS”
“EDGE”
“WCDMA”
“HSDPA”
“HSUPA”
“HSPA+”
“TDSCDMA”
“TDD LTE”
“FDD LTE”
<oper> String type; operator in numeric format
<band> String type; band selected
“CDMA BC0”
...
“CDMA BC19”
“GSM 450”
“GSM 480”
“GSM 750”
“GSM 850”
“GSM 900”
“GSM 1800”
“GSM 1900”
“WCDMA 2100”
“WCDMA 1900”
“WCDMA 1800”
“WCDMA 1700 US”
“WCDMA 850”
“WCDMA 800”
“WCDMA 2600”
“WCDMA 900”
“WCDMA 1700 JAPAN”
“WCDMA 1500”
“WCDMA 850 JAPAN”
“LTE BAND 1”
…
“LTE BAND 43”
“TDSCDMA BAND A”
“TDSCDMA BAND B”
“TDSCDMA BAND C”
“TDSCDMA BAND D”
“TDSCDMA BAND E”
“TDSCDMA BAND F”
<channel> Integer type; channel id
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 86 / 230
Example
AT+QNWINFO=?
OK
AT+QNWINFO
+QNWINFO: “FDD LTE”,46011,“LTE BAND 3”,1825
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 87 / 230
7 Call Related Commands
7.1. ATA Answer an Incoming Call
ATA connects the module to an incoming voice or data call indicated by a “RING” URC.
1. Any additional commands on the same command line are ignored.
2. This command may be aborted generally by receiving a character during execution. The aborting is
not possible during some states of connection establishment such as handshaking.
3. See also ATX.
Example
RING //A voice call is ringing
AT+CLCC
+CLCC: 1,0,0,1,0,“”,128 //PS call in LTE mode
ATA Answer an Incoming Call
Execution Command
ATA
Response
TA sends off-hook to the remote station.
Response in case of data call, if successfully connected
CONNECT<text> TA switches to data mode.
Note: <text> output only if ATX<value> parameter setting
with the <value> >0.
When TA returns to command mode after call release:
OK
Response in case of voice call, if successfully connected:
OK
Response if no connection:
NO CARRIER
Maximum Response Time
90s, determined by network.
Reference
V.25ter
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 88 / 230
+CLCC: 2,1,4,0,0,“02154450290”,129 //Incoming call
OK
ATA //Accept the voice call with ATA
OK
7.2. ATD Mobile Originated Call to Dial a Number
ATD can be used to set up outgoing voice and data calls. Supplementary Services can also be controlled
with ATD.
ATD Mobile Originated Call to Dial a Number
Execution Command
ATD<n>[<mgsm>][;]
Response
This command can be used to set up outgoing voice, data or
FAX calls. It also serves to control supplementary services.
If no dial tone and (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy and (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be established:
NO CARRIER
If connection is successful and non-voice call.
CONNECT<text> TA switches to data mode.
<text> output only if ATX<value> parameter setting with the
<value> >0
When TA returns to command mode after call release:
OK
If connection is successful and voice call:
OK
Maximum Response Time
5s, determined by network (AT+COLP=0).
Reference
V.25ter
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 89 / 230
Parameter
1. This command may be aborted generally by receiving an ATH command or a character during
execution. The aborting is not possible during some states of connection establishment such as
handshaking.
2. Parameter “I” and “i” only if no *# code is within the dial string.
3. See ATX command for setting result code and call monitoring parameters.
4. Responses returned after dialing with ATD
For voice call two different responses mode can be determined. TA returns “OK” immediately either
after dialing was completed or after the call was established. The setting is controlled by AT+COLP.
Factory default is AT+COLP=0, which causes the TA returns “OK” immediately after dialing was
completed, otherwise TA will return “OK”, “BUSY”, “NO DIALTONE”, “NO CARRIER”.
5. Using ATD during an active voice call:
- When a user originates a second voice call while there is already an active voice call, the first
call will be automatically put on hold.
- The current states of all calls can be easily checked at any time by using the AT+CLCC
command.
Example
ATD10086; //Dialing out the party‟s number
OK
7.3. ATH Disconnect Existing Connection
ATH disconnects circuit switched data calls or voice calls. AT+CHUP is also used to disconnect the voice
call.
<n> String of dialing digits and optionally V.25ter modifiers
Dialing digits: 0-9, * , #, +, A, B, C
Following V.25ter modifiers are ignored: ,(comma), T, P, !, W, @
<mgsm> String of GSM modifiers:
I Actives CLIR (Disable presentation of own number to called party)
i Deactivates CLIR (Enable presentation of own number to called party)
G Activates closed user group invocation for this call only
g Deactivates closed user group invocation for this call only
<;> Only required to set up voice call, return to command state
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 90 / 230
Parameter
7.4. AT+CVHU Voice Hang Up Control
AT+CVHU controls whether ATH can be used to disconnect the voice call.
Parameter
ATH Disconnect Existing Connection
Execution Command
ATH[n]
Response
Disconnect existing call by local TE from command line and
terminate call.
OK
Maximum Response Time
90s, determined by network.
Reference
V.25ter
<n> 0 Disconnect from line and terminate call
AT+CVHU Voice Hang Up Control
Test Command
AT+CVHU=?
Response
+CVHU: (list of supported<mode>s)
OK
Read Command
AT+CVHU?
Response
+CVHU: <mode>
OK
Write Command
AT+CVHU=<mode>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<mode> 0 ATH can be used to disconnect the voice call
1 ATH is ignored but “OK” response is returned.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 91 / 230
7.5. AT+CHUP Hang Up Call
AT+CHUP cancels all voice calls in the state of Active, Waiting and Held. For data connections, use ATH.
Example
RING //Incoming call
AT+CHUP //Hang up call
OK
7.6. +++ Switch From Data Mode to Command Mode
The +++ character sequence causes the module to switch from data mode to AT command mode. It
allows inputting AT commands while maintaining the data connection with the remote device.
AT+CHUP Hang Up Call
Test Command
AT+CHUP=?
Response
OK
Execution Command
AT+CHUP
Response
OK
ERROR
Maximum Response Time
90s, determined by network.
Reference
3GPP 27.007
+++ Switch From Data Mode to Command Mode
Execution Command
+++
Response
This command is only available during TA is in data mode.
The“+++” character sequence causes the TA to cancel the
data flow over the AT interface and switch to command mode.
This allows you to enter AT command while maintaining the
data connection with the remote server or, accordingly, the
GPRS connection.
OK
Maximum Response Time
300ms
Reference
V.25ter
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 92 / 230
1. To prevent the“+++” escape sequence from being misinterpreted as data, it should comply to following
sequence:
- Do not input any character within T1 time (1000ms) before inputting “+++”.
- Input “+++” within 1000ms, and no other characters can be inputted during this time.
- Do not input any character within T1 time (1000ms) after “+++” has been inputted.
- Switch to command mode, otherwise return to step 1.
2. To return from command mode back to data mode: Enter ATO
- Another way to change to command mode is through DTR, refer to AT&D command for details.
7.7. ATO Switch From Command Mode to Data Mode
ATO resumes the connection and switches back from command mode to data mode.
Parameter
TA returns to data mode from command mode CONNECT <text>,<text> only if ATX parameter is set as
value >0.
ATO Switch From Command Mode to Data Mode
Execution Command
ATO[n]
Response
TA resumes the connection and switches back from
command mode to data mode.
If connection is not successfully resumed:
NO CARRIER
else
TA returns to data mode from command mode CONNECT
<text>
Maximum Response Time
300ms
Reference
V.25ter
<n> 0 Switch from command mode to data mode
NOTE
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 93 / 230
7.8. ATS0 Set Number of Rings before Automatically Answering Call
ATS0 controls automatic answering mode for the incoming calls.
Parameter
If <n> is set too high, the calling party may hang up before the call is answered automatically.
Example
ATS0=3 //Set three rings before automatically answering a call
OK
RING //Call coming
RING
RING //Automatically answering the call after three rings
ATS0 Set Number of Rings before Automatically Answering Call
Read Command
ATS0?
Response
<n>
OK
Write Command
ATS0=<n>
Response
This parameter setting determines the number of rings before
auto-answer.
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0 Automatic answering is disabled
1-255 Enable automatic answering on the ring number specified
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 94 / 230
7.9. ATS6 Set Pause Before Blind Dialing
ATS6 is implemented for compatibility reasons only, and has no effect.
Parameter
7.10. ATS7 Set Number of Seconds to Wait for Connection Completion
ATS7 specifies the amount of time to wait for the connection completion in case of answering or
originating a call. If no connection is established during this time, the module disconnects from the line.
ATS6 Set Pause Before Blind Dialing
Read Command
ATS6?
Response
<n>
OK
Write Command
ATS6=<n>
Response
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0-2-10 Number of seconds to wait before blind dialing
ATS7 Set Number of Seconds to Wait for Connection Completion
Read Command
ATS7?
Response
<n>
OK
Write Command
ATS7=<n>
Response
This parameter setting determines the amount of time to wait
for the connection completion in case of answering or
originating a call.
OK
Maximum Response Time
300ms
Reference
V.25ter
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 95 / 230
Parameter
7.11. ATS8 Set the Number of Seconds to Wait for Comma Dial Modifier
ATS8 is implemented for compatibility reasons only, and has no effect.
Parameter
7.12. ATS10 Set Disconnect Delay after Indicating the Absence of Data
Carrier
ATS10 determines the amount of time, which the UE remains connected in absence of a data carrier.
<n> 0 Disabled
1-255 Number of seconds to wait for connection completion
ATS8 Set the Number of Seconds to Wait for Comma Dial Modifier
Read Command
ATS8?
Response
<n>
OK
Write Command
ATS8=<n>
Response
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 0 No pause when comma encountered in dial string
1-2-255 Number of seconds to wait
ATS10 Set Disconnect Delay after Indicating the Absence of Data Carrier
Read Command
ATS10?
Response
<n>
OK
Write Command
ATS10=<n>
Response
This parameter setting determines the amount of time that the
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 96 / 230
Parameter
7.13. AT+CBST Select Bearer Service Type
AT+CBST write command selects the bearer service <name>, the data rate <speed> and the connection
element <ce> to be used when data calls are originated.
TA will remain connected in absence of data carrier. If the
data carrier is once more detected before disconnection, the
TA remains connected.
OK
Maximum Response Time
300ms
Reference
V.25ter
<n> 1-15-254 Number of tenths of seconds to wait before disconnecting after UE has indicated
the absence of received line signal
AT+CBST Select Bearer Service Type
Test Command
AT+CBST=?
Response
+CBST: (list of supported <speed>s),(list of supported
<name>s),(list of supported <ce>s)
OK
Read Command
AT+CBST?
Response
+CBST: <speed>,<name>,<ce>
OK
Write Command
AT+CBST=[<speed>[,<name>[,<ce>]]]
Response
TA selects the bearer service <name> with data rate
<speed>, and the connection element <ce> to be used when
data calls are originated.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 97 / 230
Parameter
Table 4: Parameters Configurations Supported by AT+CBST
<speed> 0 Automatic speed selection
7 9600 bps (V.32)
12 9600 bps (V.34)
14 14400 bps (V.34)
16 28800 bps (V.34)
17 32000 bps (V.34)
39 9600 bps (V.120)
43 14400 bps (V.120)
48 28800 bps (V.120)
51 56000 bps (V.120)
71 9600 bps (V.110)
75 14400 bps (V.110)
80 28800 bps (V.110 or X.31 flag stuffing)
81 38400 bps (V.110 or X.31 flag stuffing)
83 56000 bps (V.110 or X.31 flag stuffing; this setting can be used in conjunction with
asynchronous non-transparent UDI or RDI service in order to get FTM84 64000
bps (X.31 flag stuffing; this setting can be used in conjunction with asyn-chronous
non-transparent UDI service in order to get FTM)
84 64000 bps (X.31 flag stuffing; this setting can be used in conjunction with
asynchronous non-transparent UDI service in order to get FTM )
116 64000 bps (bit transparent)
134 64000 bps (multimedia)
<name> 0 Asynchronous Modem
1 Synchronous Modem
4 Asynchronous Modem (RDI)
<ce> 0 Transparent
1 Non-transparent
<speed>
GSM
WCDMA
SYNC.
ASYNC.
ASYNC.
(RDI)
TRANSP.
NON-
TRANSP.
0
Y
Y
N
Y
N
N
Y
7
Y
N
N
Y
N
N
Y
12
Y
N
N
Y
N
N
Y
14
Y
Y
N
Y
N
N
Y
16
N
Y
N
Y
N
N
Y
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 98 / 230
3GPP TS 22.002 lists the allowed combinations of the sub-parameters.
7.14. AT+CSTA Select Type of Address
AT+CSTA write command selects the type of number for further dialing commands ATD according to
3GPP Technical Specifications. Test command returns values supported a compound value.
17
N
Y
N
Y
N
N
Y
39
Y
N
N
Y
N
N
Y
43
Y
Y
N
Y
N
N
Y
48
N
Y
N
Y
N
N
Y
51
N
Y
N
Y
N
N
Y
71
Y
N
N
Y
N
N
Y
75
Y
Y
N
Y
N
N
Y
80
Y
Y
N
Y
N
N
Y
81
Y
Y
N
Y
N
N
Y
83
Y
Y
N
Y
Y
N
Y
84
N
Y
N
Y
N
N
Y
116
N
Y
Y
N
N
Y
N
134
N
Y
Y
N
N
Y
N
AT+CSTA Select Type of Address
Test Command
AT+CSTA=?
Response
+CSTA: (list of supported <type>s)
OK
Read Command
AT+CSTA?
Response
+CSTA: <type>
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 99 / 230
Parameter
7.15. AT+CLCC List Current Calls of ME
The execution command returns the list of all current calls. If the command is executed successfully, but
no calls existed, no information response but OK is sent to TE.
OK
Write Command
AT+CSTA=<type>
Response
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<type> Current address type setting.
129 Unknown type
145 International type (contains the character “+”)
AT+CLCC List Current Calls of ME
Test Command
AT+CLCC=?
Response
OK
Execution Command
AT+CLCC
Response
TA returns a list of current calls of ME. If command executed
successfully, but no calls are existed, no information but OK
response is sent to TE.
[+CLCC :
<id1>,<dir>,<stat>,<mode>,<mpty>[,<number>,<type>[,<
alpha>]]
[+CLCC:
<id2>,<dir>,<stat>,<mode>,<mpty>[,<number>,<type>[,<
alpha>]]
[...]
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 100 / 230
Parameter
Example
ATD10086; //Establish a call
OK
AT+CLCC
+CLCC: 1,0,0,1,0,"",128 //PS call in LTE mode
+CLCC: 2,0,0,0,0,“10086”,129 //Establish a call, and the call has been answered
OK
Reference
3GPP TS 27.007
<idx> Integer type; call identification number as described in 3GPP TS 22.030 sub clause 4.5.5.1;
this number can be used in AT+CHLD Command operations
<dir> 0 Mobile originated (MO) call
1 Mobile terminated (MT) call
<stat> State of the call
0 Active
1 Held
2 Dialing (MO call)
3 Alerting (MO call)
4 Incoming (MT call)
5 Waiting (MT call)
<mode> Bearer/tele service
0 Voice
1 Data
2 FAX
<mpty> 0 Call is not one of multiparty (conference) call parties
1 Call is one of multiparty (conference) call parties
<number> Phone number in string type in format specified by <type>
<type> Type of address of octet in integer format(Refer to 3GPP TS 24.008, subclause 10.5.4.7 for
details). Usually, it has three kinds of values:
129 Unknown type
145 International type (contains the character “+”)
161 National type
<alpha> Alphanumeric representation of <number> corresponding to the entry found in phonebook.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 101 / 230
7.16. AT+CR Service Reporting Control
AT+CR controls the module whether or not to transmit an intermediate result code +CR: <serv> to the TE
when a call is being set up.
If it is enabled, an intermediate result code is transmitted at the point during connect negotiation at which
the TA has determined which speed and quality of service will be used, before any error control or data
compression reports are transmitted, and before any final result code (e.g. CONNECT) is transmitted.
Parameter
7.17. AT+CRC Set Cellular Result Codes for Incoming Call Indication
AT+CRC controls whether or not to use the extended format of incoming call indication.
AT+CR Service Reporting Control
Test Command
AT+CR=?
Response
+CR: (list of supported <mode>s)
OK
Read Command
AT+CR?
Response
+CR: <mode>
OK
Write Command
AT+CR=[<mode>]
Response
TA controls whether or not intermediate result code +CR:
<serv> is returned from the TA to the TE when a call set up.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<mode> 0 Disable
1 Enable
<serv> ASYNC Asynchronous transparent
SYNC Synchronous transparent
REL ASYNC Asynchronous non-transparent
REL SYNC Synchronous non-transparent
GPRS GPRS
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 102 / 230
When it is enabled, an incoming call is indicated to the TE with unsolicited result code +CRING: <type>
instead of the normal RING.
Parameter
Example
AT+CRC=1 //Enable extended format
OK
+CRING: VOICE //Indicate incoming call to the TE
ATH
OK
AT+CRC=0 //Disable extended format
OK
RING //Indicate incoming call to the TE
AT+CRC Set Cellular Result Codes for Incoming Call Indication
Test Command
AT+CRC=?
Response
+CRC: (list of supported <mode>s)
OK
Read Command
AT+CRC?
Response
+CRC: <mode>
OK
Write Command
AT+CRC=[<mode>]
Response
TA controls whether or not the extended format of incoming
call indication is used.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<mode> 0 Disable extended format
1 Enable extended format
<type> ASYNC Asynchronous transparent
SYNC Synchronous transparent
REL ASYNC Asynchronous non-transparent
REL SYNC Synchronous non-transparent
FAX Facsimile
VOICE Voice
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 103 / 230
ATH
OK
7.18. AT+CRLP Select Radio Link Protocol Parameter
AT+CRLP write command sets radio link protocol (RLP) parameters used when non-transparent data
calls are originated.
AT+CRLP Select Radio Link Protocol Parameter
Test Command
AT+CRLP=?
Response
TA returns values supported. RLP (Radio Link Protocol)
versions 0 and 1 share the same parameter set. TA returns
only one line for this set (where <ver> is not presented).
+CRLP:
(list of supported <iws>s),(list of supported <mws>s),(list of
supported <T1>s),(list of supported <N2>s),
<ver>
+CRLP:
(list of supported <iws>s),(list of supported <mws>s),(list of
supported <T1>s),(list of supported <N2>s),
<ver>
+CRLP:
(list of supported <iws>s),(list of supported <mws>s),(list of
supported <T1>s),(list of supported <N2>s),
<ver>
OK
Read Command
AT+CRLP?
Response
TA returns current settings for RLP version. RLP versions 0
and 1 share the same parameter set. TA returns only one line
for this set (where <ver> is not presented).
+CRLP: <iws>,<mws>,<T1>,<N2>,<ver>
+CRLP: <iws>,<mws>,<T1>,<N2>,<ver>
+CRLP: <iws>,<mws>,<T1>,<N2>,<ver>
OK
Write Command
AT+CRLP=[<iws>[,<mws>[,<T1>[,<N2
>[,<ver>]]]]]
Response
TA sets radio link protocol (RLP) parameters used when
non-transparent data calls are set up.
OK
Maximum Response Time
300ms
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 104 / 230
Parameter
7.19. AT+QECCNUM Configure Emergency Call Numbers
AT+QECCNUM can be used to query, add and delete ECC numbers (emergency call numbers). There
are two kinds of ECC numbers, ECC numbers without SIM and ECC numbers with SIM. The default ECC
numbers without SIM is 911, 112, 00, 08, 110, 999, 118 and 119. The default ECC number with SIM is 911
and 112. 911 and 112 will always be supported as ECC numbers, and can‟t be deleted. ECC numbers can
be saved into NV automatically. If the SIM card contains ECC File, the numbers in ECC File can also be
regarded as ECC numbers.
The maximal supported ECC numbers of each type is 20.
Reference
3GPP TS27.007
<iws> 0-61 Interworking window size (IWF to MS)
0-240-488 For <ver>=2
<mws> 0-61 Mobile window size (MS to IWF)
0-240-488 For <ver>=2
<T1> 38-48-255 Acknowledgment timer T1 in a unit of 10ms
42-52-255 For <ver>=2
<N2> 1-6-255 Retransmission attempts N2
<ver> 0-2 RLP version number in integer format
AT+QECCNUM Configure Emergency Call Numbers
Test Command
AT+QECCNUM=?
Response
+QECCNUM: (list of supported <mode>s)
OK
Read Command
AT+QECCNUM?
Response
+QECCNUM: 0,<eccnum1>,<eccnum2>[…]
+QECCNUM: 1,<eccnum1>,<eccnum2>[…]
OK
Write Command
AT+QECCNUM=<mode>,<type>[,<ecc
num1>[,<eccnum2>,…[,<eccnumN>]]
]
Response
If <mode> is equal to 0, query the ECC numbers,
<eccnumN> should be omitted, returns:
+QECCNUM: <type>,<eccnum1>,<eccnum2>[…]
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 105 / 230
Parameter
<mode> ECC number operation mode
0 Query ECC numbers
1 Add ECC numbers
2 Delete ECC numbers
<type> ECC number type
0 ECC numbers without SIM
1 ECC numbers with SIM
<eccnum> String type; ECC numbers ( e.g.110, 119)
Example
AT+QECCNUM=? //Query the supported ECC number operation mode
+QECCNUM: (0-2)
OK
AT+QECCNUM? //Query the ECC numbers without SIM or with SIM
+QECCNUM: 0,"911","112","00","08","110","999","118","119"
+QECCNUM: 1,"911","112"
OK
AT+QECCNUM=0,1 //Query the ECC numbers with SIM
+QECCNUM: 1,"911","112"
OK
AT+QECCNUM=1,1,"110", "234" //Add "110" and "234" into the type of ECC numbers with SIM
OK
AT+QECCNUM=0,1 //Query the ECC numbers with SIM
+QECCNUM: 1, "911","112","110","234"
OK
If <mode> is not equal to 0: <mode>=1 is used to add the
ECC number; <mode>=2 is used to delete the ECC number.
In this case, at least one ECC number <eccnumN> should be
inputted, returns:
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 106 / 230
AT+QECCNUM=2,1,"110" //Delete "110" from the type of ECC numbers with SIM
OK
AT+QECCNUM=0,1 //Query the ECC numbers with SIM
+QECCNUM: 1, "911","112","234"
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 107 / 230
8 Phonebook Commands
8.1. AT+CNUM Subscriber Number
AT+CNUM can get the subscribers own number(s) from the SIM.
Parameter
AT+CNUM Subscriber Number
Test Command
AT+CNUM=?
Response
OK
Execution Command
AT+CNUM
Response
[+CNUM: [<alpha>], <number>,<type>]
[+CNUM: [<alpha>], <number>,<type>]
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP 27.007
<alpha> Optional alphanumeric string associated with <number>; the used character set
should be the one selected with command Select TE Character Set +CSCS
<number> String type phone number of format specified by <type>
<type> Type of address of octet in integer format (Refer to 3GPP TS 24.008, subclause
10.5.4.7 for details). Usually, it has three kinds of values:
129 Unknown type
145 International type (contains the character “+”)
161 National type
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 108 / 230
8.2. AT+CPBF Find Phonebook Entries
AT+CPBF can search the phonebook entries starting with the given <findtext> string from the current
phonebook memory storage selected with +CPBS, and return all found entries sorted in alphanumeric
order.
Parameter
AT+CPBF Find Phonebook Entries
Test Command
AT+CPBF=?
Response
+CPBF: <nlength>,<tlength>
OK
Write Command
AT+CPBF=<findtext>
Response
[+CPBF: <index>,<number>,<type>,<text>]
[…]
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
Depends on the storage of phonebook entries.
Reference
3GPP 27.007
<nlength> Integer type, indicates the maximum length of field <number>
<tlength> Integer type, indicates the maximum length of field <text>
<findtext> String type, field of maximum length <tlength> in current TE character set specified by
+CSCS.
<index> Integer type, in the range of location numbers of phone book memory
<type> Type of address of octet in integer format (Refer to 3GPP TS 24.008, subclause
10.5.4.7 for details). Usually, it has three kinds of values:
129 Unknown type
145 International type (contains the character “+”)
161 National type
<text> String type, field of maximum length <tlength> in current TE character set specified by
+CSCS.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 109 / 230
8.3. AT+CPBR Read Phonebook Entries
AT+CPBR can return phonebook entries in location number range <index1>... <index2> from the current
phonebook memory storage selected with +CPBS. If <index2> is left out, only location <index1> is
returned.
Parameter
AT+CPBR Read Phonebook Entries
Test Command
AT+CPBR=?
Response
+CPBR: (list of supported <index>s),<nlength>,<tlength>
OK
Write Command
AT+CPBR=<index1>[,<index2>]
Response
+CPBR: <index1>,<number>,<type>,<text>
[+CPBR: <index2>,<number>,<type>,<text>
[…]]
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
Depends on the storage of phonebook entries.
Reference
3GPP 27.007
<index> Integer type, in the range of location numbers of phone book memory
<nlength> Integer type, indicates the maximum length of field <number>
<tlength> Integer type, indicates the maximum length of field <text>
<index1> The first phone book record to read
<index2> The last phonebook record to read
<type> Type of address of octet in integer format (Refer to 3GPP TS 24.008, subclause
10.5.4.7 for details). Usually, it has three kinds of values:
129 Unknown type
145 International type(contains the character “+”)
161 National type
<text> String type, field of maximum length <tlength> in current TE character set specified by
+CSCS.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 110 / 230
8.4. AT+CPBS Select Phonebook Memory Storage
AT+CPBS selects phonebook memory storage, which is used by other phonebook commands. Read
command returns currently selected memory, and number of used locations and total number of locations
in the memory when supported by manufacturer. Test command returns supported storages as compound
value.
Parameter
AT+CPBS Select Phonebook Memory Storage
Test Command
AT+CPBS=?
Response
+CPBS: (list of supported <storage>s)
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Read Command
AT+CPBS?
Response
+CPBS: <storage>,<used>,<total>
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CPBS=<storage>
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP 27.007
<storage> “SM” SIM phonebook
“DC” ME dialed calls list (+CPBW may not be applicable on this storage)
“FD” SIM fix dialing-phone book (+CPBW operation need the authority of PIN2)
“LD” SIM last-dialing-phone book (+CPBW may not be applicable on this storage)
“MC” ME missed (unanswered) calls list(+CPBW may not be applicable on this storage)
“ME” Mobile equipment phonebook
“RC” ME received calls list (+CPBW may not be applicable on this storage)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 111 / 230
8.5. AT+CPBW Write Phonebook Entry
AT+CPBW writes phonebook entry in location number <index> in the current phonebook memory
storage selected with +CPBS. It can also delete a phonebook entry in location number <index>.
Parameter
“EN” SIM (or ME) emergency number (+CPBW may not be applicable on this storage)
“ON” SIM own numbers (MSISDNs) list
<used> Integer type, indicates the total number of used locations in selected memory
<total> Integer type, indicates the total number of locations in selected memory
AT+CPBW Write Phonebook Entry
Test Command
AT+CPBW=?
Response
+CPBW: (The range of supported <index>s), <nlength>, (list
of supported <type>s), <tlength>
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CPBW=[<index>][,<number>[,<ty
pe>[,<text>]]]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP 27.007
<index> Integer type, in the range of location numbers of phone book memory. If <index> is not
given, the first free entry will be used. If <index> is given as the only parameter, the
phonebook entry specified by <location> is deleted.
<nlength> Integer type, indicates the maximum length of field <number>
<tlength> Integer type, indicates the maximum length of field <text>
<type> Type of address of octet in integer format (Refer to 3GPP TS 24.008, subclause
10.5.4.7 for details). Usually, it has three kinds of values:
129 Unknown type
145 International type (contains the character “+”)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 112 / 230
Example
AT+CSCS=“GSM”
OK
AT+CPBW=10,“15021012496”,129,“QUECTEL”
OK //Make a new phonebook entry at location 10
AT+CPBW=10 //Delete entry at location 10
OK
161 National type
<text> String type field of maximum length <tlength> in current TE character set specified by
+CSCS.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 113 / 230
9 Short Message Service Commands
9.1. AT+CSMS Select Message Service (Not Effective in CDMA Network)
AT+CSMS selects messaging service <service> and returns the types of messages supported by the
ME.
Parameter
AT+CSMS Select Message Service (Not Effective in CDMA Network)
Test Command
AT+CSMS=?
Response
+CSMS: (list of supported <service>s)
OK
Read Command
AT+CSMS?
Response
+CSMS: <service>,<mt>,<mo>,<bm>
OK
Write Command
AT+CSMS=<service>
Response
+CSMS: <mt>,<mo>,<bm>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<service> Type of message service
0 3GPP TS 23.040 and 3GPP TS 23.041 (the syntax of SMS AT commands is
compatible with 3GPP TS 27.005 Phase 2 version 4.7.0; Phase 2+ features
which do not require new command syntax may be supported, e.g. correct
routing of messages with new Phase 2+ data coding schemes).
1 3GPP TS 23.040 and 3GPP TS 23.041 (the syntax of SMS AT commands is
compatible with 3GPP TS 27.005 Phase 2+ version; the requirement of
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 114 / 230
Example
AT+CSMS=? //Test command
+CSMS: (0,1)
OK
AT+CSMS=1 //Set type of message service as 1
+CSMS: 1,1,1
OK
AT+CSMS? //Read command
+CSMS: 1,1,1,1
OK
9.2. AT+CMGF Message Format
AT+CMGF specifies the input and output format of the short messages. <mode> indicates the format of
messages used with send, list, read and write commands and unsolicited result codes resulting from
received messages.
Mode can be either PDU mode (entire TP data units used) or text mode (headers and body of the
messages given as separate parameters). Text mode uses the value of parameter <chest> specified by
command +CSCS to inform the character set to be used in the message body in the TA-TE interface.
<service> setting 1 is mentioned under corresponding command
description-s).
<mt> Mobile terminated messages
0 Type not supported
1 Type supported
<mo> Mobile originated messages
0 Type not supported
1 Type supported
<bm> Broadcast type messages
0 Type not supported
1 Type supported
AT+CMGF Message Format
Test Command
AT+CMGF=?
Response
+CMGF: (list of supported <mode>s)
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 115 / 230
Parameter
AT+CMGF now only supports Text mode in CDMA network.
9.3. AT+CSCA Service Center Address (Not Supported in CDMA
Network)
AT+CSCA write command updates the SMSC address when mobile originated SMS are transmitted. In
text mode, the setting is used by write commands. In PDU mode, setting is used by the same commands,
but only when the length of the SMSC address is coded into the <pdu> parameter which equals to zero.
Read Command
AT+CMGF?
Response
+CMGF: <mode>
OK
Write Command
AT+CMGF[=<mode>]
Response
TA sets parameter to denote which kind of I/O format of
messages is used.
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<mode> 0 PDU mode
1 Text mode
AT+CSCA Service Center Address (Not Supported in CDMA Network)
Test Command
AT+CSCA=?
Response
OK
Read Command
AT+CSCA?
Response
+CSCA: <sca>,<tosca>
OK
Write Command
AT+CSCA=<sca>[,<tosca>]
Response
OK
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 116 / 230
Parameter
Example
AT+CSCA=“+8613800210500”,145 //Set SMS service center address
OK
AT+CSCA? //Query SMS service center address
+CSCA: “+8613800210500”,145
OK
9.4. AT+CPMS Preferred Message Storage
AT+CPMS selects memory storages <mem1>,<mem2>and <mem3> to be used for reading, writing, etc.
AT+CPMS Preferred Message Storage
Test Command
AT+CPMS=?
Response
+CPMS: (list of supported <mem1>s),(list of supported
<mem2>s),(list of supported <mem3>s)
OK
Read Command
AT+CPMS?
Response
+CPMS:
<mem1>,<used1>,<total1>,<mem2>,<used2>,<total2>,<m
em3>,<used3>,<total3>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<sca> Service center address. 3GPP TS 24.011 RP SC address Address-Value field in string
format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
3GPP TS 27.007 ); type of address is given by <tosca>.
<tosca> Type of service center address. 3GPP TS 24.011 RP SC address Type-of-Address
octet in integer format (default refer to <toda>).
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 117 / 230
Write Command
AT+CPMS=<mem1>[,<mem2>[,<mem
3>]]
Response
TA selects memory storages <mem1>, <mem2> and
<mem3> to be used for reading, writing, etc.
+CPMS:
<used1>,<total1>,<used2>,<total2>,<used3>,<total3>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
Parameter
Example
AT+CPMS? //Query the currently SMS message storage
+CPMS: “ME”,0,255,“ME”,0,255,“ME”,0,255
OK
AT+CPMS=“SM”,“SM”,“SM” //Set SMS message storage as “SM”
+CPMS: 0,50,0,50,0,50
OK
AT+CPMS? //Query the currently SMS message storage
<mem1> Messages to be read and deleted from this memory storage
“SM” SIM message storage
“ME” Mobile Equipment message storage
“MT” Same as “ME” storage
<mem2> Messages will be written and sent to this memory storage
“SM” SIM message storage
“ME” Mobile equipment message storage
“MT” Same as “ME” storage
<mem3> Received messages will be placed in this memory storage if routing to PC is not set
(“+CNMI”)
“SM” SIM message storage
“ME” Mobile equipment message storage
“MT” Same as “ME” storage
<usedx> Integer type, number of current messages in <memx>
<totalx> Integer type, total number of messages which can be stored in <memx>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 118 / 230
+CPMS: “SM”,0,50,“SM”,0,50,“SM”,0,50
OK
9.5. AT+CMGD Delete Message
AT+CMGD deletes a short message from the preferred message storage <mem1> location <index>. If
<delflag> is presented and not set to 0, then the ME shall ignore <index> and follow the rules of
<delflag> shown as below.
Parameter
AT+CMGD Delete Message
Test Command
AT+CMGD=?
Response
+CMGD: (list of supported <index>s),(list of supported
<delflag>s)
OK
Write Command
AT+CMGD=<index>[,<delflag>]
Response
TA deletes message from preferred message storage
<mem1> location <index>.
OK
If error is related to ME functionality:
+CMS ERROR:<err>
Maximum Response Time
300ms.
Note: Operation of <delflag> depends on the storage of
deleted messages.
Reference
3GPP TS 27.005
<index> Integer type, in the range of location numbers supported by the associated memory
<delflag> 0 Delete message specified in <index>
1 Delete all read messages from <mem1> storage
2 Delete all read messages from <mem1> storage and sent mobile originated
messages
3 Delete all read messages from <mem1> storage, sent and unsent mobile
originated messages
4 Delete all messages from <mem1> storage
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 119 / 230
Example
AT+CMGD=1 //Delete message specified in <index>=1
OK
AT+CMGD=1,4 //Delete all messages from <mem1> storage
OK
9.6. AT+CMGL List Messages
AT+CMGL read command returns messages with status value <stat> from preferred message storage
<mem1> to the TE. If the status of the message is “REC UNREAD”, the status in the storage changes to
“REC READ”. When executing command AT+CMGL without status value <stat>, it will report the list of
SMS with “REC UNREAD” status.
AT+CMGL List Messages
Test Command
AT+CMGL=?
Response
+CMGL: (list of supported <stat>s)
OK
Write Command
AT+CMGL[=<stat>]
Response
In Non-CDMA mode:
If text mode (+CMGF=1) and command successful:
For SMS-SUBMITs and/or SMS-DELIVERs:
+CMGL:
<index>,<stat>,<oa/da>,[<alpha>],[<scts>][,<tooa/toda>,<
length>]<CR><LF><data>[<CR><LF>
+CMGL:
<index>,<stat>,<da/oa>,[<alpha>],[<scts>][,<tooa/toda>,<
length>]<CR><LF><data>[...]]
For SMS-STATUS-REPORTs:
+CMGL:
<index>,<stat>,<fo>,<mr>,[<ra>],[<tora>],<scts>,<dt>,<st
>[<CR><LF>
+CMGL:
<index>,<stat>,<fo>,<mr>,[<ra>],[<tora>],<scts>,<dt>,<st
>[...]]
For SMS-COMMANDs:
+CMGL: <index>,<stat>,<fo>,<ct>[<CR><LF>
+CMGL: <index>,<stat>,<fo>,<ct>[...]]
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 120 / 230
Parameter
For CBM storage:
+CMGL:<index>,<stat>,<sn>,<mid>,<page>,<pages><CR
><LF><data>[<CR><LF>
+CMGL:
<index>,<stat>,<sn>,<mid>,<page>,<pages><CR><LF><d
ata>[...]]
OK
Else If PDU mode (+CMGF=0) and command successful:
+CMGL:<index>,<stat>,[<alpha>],<length><CR><LF><pd
u><CR><LF>
+CMGL:
<index>,<stat>,[alpha],<length><CR><LF><pdu>[...]]
OK
In CDMA Text mode:
+CMGL:
<index>,<stat>,<oa/da>,<scts>,<alpha>,<tooa/toda>,<len
gth><CR><LF><data>[<CR><LF>]
OK
Else if error is related to ME functionality:
+CMS ERROR: <err>
Execution Command
AT+CMGL
Response
List all messages with “REC UNREAD” status from message
storage <mem1>, then status in the storage changes to “REC
READ”.
Maximum Response Time
300ms.
Note: Operation of <stat> depends on the storage of listed
messages.
Reference
3GPP TS 27.005
<stat> In text mode:
“REC UNREAD” Received unread messages
“REC READ” Received read messages
“STO UNSENT” Stored unsent messages
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 121 / 230
“STO SENT” Stored sent messages
“ALL” All messages
In PDU mode:
0 Received unread messages
1 Received read messages
2 Stored unsent messages
3 Stored sent messages
4 All messages
<index> Integer type, in the range of location numbers supported by the associated memory
<da> Destination Address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are
converted to characters of the currently selected TE character set (refer to command
+CSCS in 3GPP TS 27.007 ); type of address is given by <toda>.
<oa> Originating address. 3GPP TS 23.040 TP-Originating-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted
to characters of the currently selected TE character set (refer to command +CSCS in
TS 27.007); type of address is given by <tooa>.
<alpha> String type alphanumeric representation of <da> or <oa> corresponding to the entry
found in MT phonebook; implementation of this feature is manufacturer specified; the
used character set should be the one selected with command Select TE Character Set
+CSCS (see definition of this command in 3GPP TS 27.007).
<scts> Service centre time stamp. 3GPP TS 23.040 TP-Service-Centre-Time-Stamp in
time-string format (refer to <dt>).
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<tooa> Type of originating address. 3GPP TS 24.011 TP-Originating-Address
Type-of-Address octet in integer format (default refer to <toda>).
<length> Message length, integer type, indicating in the text mode (+CMGF=1) the length
of the message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0),
the length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets
are not counted in the length).
<data> In the case of SMS: 3GPP TS 23.040 TP-User-Data in text mode responses; format:
- If <dcs>, indicates that 3GPP TS 23.038 GSM 7 bit default alphabet is used and
<fo> indicates that 3GPP TS 23.040 TP-User-Data-Header-Indication is not set.
- If TE character set other than “HEX” (refer to command Select TE Character Set
+CSCS in 3GPP TS 27.007): ME/TA converts GSM alphabet into current TE
character set according to rules of Annex A.
- If TE character set is “HEX”: ME/TA converts each 7-bit character of GSM 7 bit
default alphabet into two IRA character long hexadecimal number (e.g. character
(GSM 7 bit default alphabet 23) is presented as 17 (IRA 49 and 55)).
- If <dcs>, indicates that 8-bit or UCS2 data coding scheme is used, or <fo>
indicates that 3GPP TS 23.040 TP-User-Data-Header-Indication is set: ME/TA
converts each 8-bit octet into two IRA character long hexadecimal number (e.g.
octet with integer value 42 is presented to TE as two characters 2A (IRA 50 and
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 122 / 230
AT+CMGL now only supports Text mode in CDMA network.
Example
AT+CMGF=1 //Set SMS message format as text mode
OK
AT+CMGL=“ALL” //List all messages from message storage
+CMGL: 1,“STO UNSENT”,“”,,
<This is a test from Quectel>
+CMGL: 2,“STO UNSENT”,“”,,
<This is a test from Quectel>
OK
9.7. AT+CMGR Read Message
AT+CMGR read command returns SMS message with location value <index> from message storage
<mem1> to the TE. If status of the message is “REC UNREAD”, status in the storage changes to “REC
READ”.
65)).
In the case of CBS: 3GPP TS 23.041 CBM Content of Message in text mode
responses; format:
- If <dcs>, indicates that 3GPP TS 23.038 GSM 7 bit default alphabet is used:
- If TE character set other than “HEX” (refer to command +CSCS in 3GPP
TS27.007): ME/TA converts GSM alphabet into current TE character set according
to rules of Annex A.
- If TE character set is “HEX”: ME/TA converts each 7-bit character of the GSM 7 bit
default alphabet into two IRA character long hexadecimal number.
- If <dcs>, indicates that 8-bit or UCS2 data coding scheme is used: ME/TA converts
each 8-bit octet into two IRA character long hexadecimal number.
<pdu> In the case of SMS: 3GPP TS 24.011 SC address followed by 3GPP TS 23.040 TPDU
in hexadecimal format: ME/TA converts each octet of TP data unit into two IRA
character long hexadecimal number (e.g. octet with integer value 42 is presented to
TE as two characters 2A (IRA 50 and 65))3GPP TS 27.007.
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 123 / 230
AT+CMGR Read Message
Test Command
AT+CMGR=?
Response
OK
Write Command
AT+CMGR=<index>
Response
TA returns SMS message with location value <index> from
message storage <mem1> to the TE. If status of the
message is “REC UNREAD”, status in the storage changes to
“REC READ”.
In Non-CDMA mode:
If text mode (+CMGF=1) and command is executed
successfully:
For SMS-DELIVER:
+CMGR:
<stat>,<oa>,[<alpha>],<scts>[,<tooa>,<fo>,<pid>,<dcs>,<
sca>,<tosca>,<length>]<CR><LF><data>
OK
For SMS-SUBMIT:
+CMGR:
<stat>,<da>,[<alpha>][,<toda>,<fo>,<pid>,<dcs>,[<vp>],<
sca>,<tosca>,<length>]<CR><LF><data>
OK
For SMS-STATUS-REPORTs:
+CMGR:
<stat>,<fo>,<mr>,[<ra>],[<tora>],<scts>,<dt>,<st>
OK
For SMS-COMMANDs:
+CMGR:
<stat>,<fo>,<ct>[,<pid>,[<mn>],[<da>],[<toda>],<length><
CR><LF><cdata>]
OK
For CBM storage:
+CMGR:
<stat>,<sn>,<mid>,<dcs>,<page>,<pages><CR><LF><dat
a>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 124 / 230
Parameter
OK
If PDU mode (+CMGF=0) and command successful:
+CMGR: <stat>,[<alpha>],<length><CR><LF><pdu>
OK
In CDMA Text mode:
+CMGR:
<stat>,<oa/da>,<scts>,<alpha>,<tooa/toda>,<lang>,<fmt>
,<length>,<prt>,<prv>,<type><CR><LF><data>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
Depends on the length of message content.
Reference
3GPP TS 27.005
<index> Integer type, in the range of location numbers supported by the associated memory
<stat> Text mode Explanation
“REC UNREAD” Received unread messages
“REC READ” Received read messages
“STO UNSENT” Stored unsent messages
“STO SENT” Stored sent messages
“ALL” All messages
PDU mode Explanation
0 Received unread messages
1 Received read messages
2 Stored unsent messages
3 Stored sent messages
4 All messages
<alpha> String type alphanumeric representation of <da> or <oa> corresponding to the entry
found in MT phonebook; implementation of this feature is manufacturer specified; the
used character set should be the one selected with command Select TE Character Set
+CSCS (see definition of this command in 3GPP TS 27.007).
<da> Destination address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 125 / 230
3GPP TS 27.007 ); type of address is given by <toda>.
<oa> Originating address. 3GPP TS 23.040 TP-Originating-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in TS
27.007); type of address is given by <tooa>.
<scts> Service center time stamp. 3GPP TS 23.040 TP-Service-Centre-Time-Stamp in
time-string format (refer to <dt>).
<fo> First octet. Depending on the command or result code: First octet of 3GPP TS 23.040
SMS-DELIVER, SMS-SUBMIT (default 17), SMS-STATUS-REPORT, or
SMS-COMMAND in integer format. If a valid value has been entered once, parameter
can be omitted.
<pid> Protocol identifier. 3GPP TS 23.040 TP-Protocol-Identifier in integer format (default
0).
<dcs> Data coding scheme. Depending on the command or result code: 3GPP TS 23.038
SMS Data Coding Scheme (default 0), or Cell Broadcast Data Coding Scheme in
integer format.
<vp> Validity period. Depending on SMS-SUBMIT <fo> setting: 3GPP TS 23.040
TP-Validity-Period either in integer format or in time-string format (refer to <dt>).
<mn> Message number. 3GPP TS 23.040 TP-Message-Number in integer format.
<mr> Message reference. 3GPP TS 23.040 TP-Message-Reference in integer format.
<ra> Recipient address. 3GPP TS 23.040 TP-Recipient-Address Address-Value field in
string format; BCD numbers (or GSM default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command AT+CSCS.);
type of address given by <tora>.
<tora> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format (default refer <toda>).
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<tooa> Type of originating address.3GPP TS 24.011 TP-Originating-Address Type-of-Address
octet in integer format (default refer to <toda>).
<sca> Service center address. 3GPP TS 24.011 RP SC address Address-Value field in string
format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
3GPP TS 27.007 ); type of address is given by <tosca>.
<tosca> Type of service center address. 3GPP TS 24.011 RP SC address Type-of-Address octet
in integer format (default refer to <toda>).
<length> Message length, integer type, indicating in the text mode (+CMGF=1) the length of the
message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0), the
length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets are
not counted in the length).
<data> The text of short message. Please refer 14.8 SMS Character Sets Conversions for the
detail.
<pdu> In the case of SMS: 3GPP TS 24.011 SC address followed by 3GPP TS 23.040 TPDU
in hexadecimal format: ME/TA converts each octet of TP data unit into two IRA
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 126 / 230
AT+CMGR now only supports Text mode in CDMA network.
Example
+CMTI: “SM”,3 //Indicates that new message has been received and saved
to <index>=3 of “SM”
AT+CSDH=1
OK
AT+CMGR=3 //Read message
+CMGR: “REC UNREAD”,“+8615021012496”,,“13/12/13,15:06:37+32”,145,4,0,0,“+861380021050
0”,145,27
character long hexadecimal number (e.g. octet with integer value 42 is presented to TE
as two characters 2A (IRA 50 and 65))3GPP TS 27.007.
<prt> Priority
0 Normal
1 Interactive
2 Urgent
3 Emergency
<fmt> Format
0 GSM 7 bit
1 ASCII
6 UNICODE
<prv> Privacy
0 Normal
1 Restricted
2 Confidential
3 Secret
<lang> Language
0 Unspecified
1 English
2 French
3 Spanish
4 Japanese
5 Korean
6 Chinese
7 Hebrew
<type> 0 Normal
1 CPT
2 Voice Mail
3 SMS Report
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 127 / 230
<This is a test from Quectel>
OK
9.8. AT+CMGS Send Message
AT+CMGS write command sends a short message from TE to network (SMS-SUBMIT). After invoking the
write command, wait for the prompt “>” and then start to write the message. Then enter <CTRL-Z> to
indicate the ending of PDU and begin to send the message. Sending can be cancelled by giving <ESC>
character. Abortion is acknowledged with “OK”, though the message will not be sent. The message
reference <mr> is returned to the TE on successful message delivery. The value can be used to identify
message upon unsolicited delivery status report result code.
AT+CMGS Send Message
Test Command
AT+CMGS=?
Response
OK
Write Command
1) If text mode (+CMGF=1):
AT+CMGS=<da>[,<toda>]<CR>
text is entered
<ctrl-Z/ESC>
ESC quits without sending
2) If PDU mode (+CMGF=0):
AT+CMGS=<length><CR>
PDU is given <ctrl-Z/ESC>
Response
TA sends message from a TE to the network (SMS-SUBMIT).
Message reference value <mr> is returned to the TE on
successful message delivery. Optionally (when +CSMS
<service> value is 1 and network supports) <scts> is
returned. Values can be used to identify message upon
unsolicited delivery status report result code.
If text mode (+CMGF=1) and sent successfully:
+CMGS: <mr>
OK
If PDU mode (+CMGF=0) and sent successfully:
+CMGS: <mr>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
120s, determined by network.
Reference
3GPP TS 27.005
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 128 / 230
Parameter
AT+CMGS now only supports Text mode in CDMA network.
Example
AT+CMGF=1 //Set SMS message format as text mode
OK
AT+CSCS=“GSM” //Set character set as GSM which is used by the TE
OK
AT+CMGS=“15021012496”
> <This is a test from Quectel> //Enter in text, <CTRL-Z> send message, <ESC> quits
without sending
+CMGS: 247
OK
9.9. AT+CMMS More Messages to Send (Not Effective in CDMA Network)
AT+CMMS controls the continuity of the SMS relay protocol link. If the feature is enabled (and supported
by the currently used network) multiple messages can be sent faster as the link is kept open.
<da> Destination address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are
converted to characters of the currently selected TE character set (refer to command
+CSCS in 3GPP TS 27.007 ); type of address is given by <toda>.
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<length> Message length. Integer type, indicating in the text mode (+CMGF=1) the length of the
message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0), the
length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets are
not counted in the length).
<mr> Message reference. 3GPP TS 23.040 TP-Message-Reference in integer format.
AT+CMMS More Messages to Send (Not Effective in CDMA Network)
Test Command
AT+CMMS=?
Response
+CMMS: (list of supported<n>s)
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 129 / 230
Parameter
1. AT+CMMS is not effective in CDMA network.
2. After the use of read command, a delay of 5-10 seconds is required before issuing the write
command, otherwise the “+CMS ERROR: 500” may appear.
9.10. AT+CMGW Write Message to Memory
AT+CMGW write and execution commands store a short message from TE to memory storage <mem2>.
Memory location <index> of the stored message is returned. Message status will be set to “stored
unsent” by default, but parameter <stat> also allows other status values to be given.
The syntax of input text is same as the one specified in the write command +CMGS.
OK
Read Command
AT+CMMS?
Response
+CMMS: <n>
OK
Write Command
AT+CMMS=<n>
Response
OK
ERROR
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
120s, determined by network.
Reference
3GPP TS 27.005
<n> 0 Feature disabled
1 Keep enabled until the time between the response of the latest message send command
(+CMGS, +CMSS, etc.) and the next send command exceeds 1-5 seconds (the exact value is
up to ME implementation), then ME shall close the link and TA switches <n> back to 0
automatically
2 Enable (if the time between the response of the latest message send command and the next
send command exceeds 1-5 seconds (the exact value is up to ME implementation), ME shall
close the link but TA will not switch <n> back to 0 automatically)
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 130 / 230
Parameter
AT+CMGW Write Message to Memory
Test Command
AT+CMGW=?
Response
OK
Write Command
1) If text mode (+CMGF=1):
AT+CMGW=<oa/da>[,<tooa/toda>[,<st
at>]]<CR> text is entered
<ctrl-Z/ESC>
<ESC> quits without sending
2) If PDU mode (+CMGF=0):
AT+CMGW=<length>[,<stat>]<CR>
PDU is given <ctrl-Z/ESC>
Response
TA transmits SMS message (either SMS-DELIVER or
SMS-SUBMIT) from TE to memory storage <mem2>.
Memory location <index> of the stored message is returned.
By default message status will be set to „stored unsent‟, but
parameter <stat> also allows other status values to be given.
If writing is successful:
+CMGW: <index>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<da> Destination address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
3GPP TS 27.007 ); type of address is given by <toda>.
<oa> Originating address. 3GPP TS 23.040 TP-Originating-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in TS
27.007); type of address given by <tooa>.
<tooa> Type of originating address. 3GPP TS 24.011 TP-Originating-Address Type-of-Address
octet in integer format (default refer to <toda>).
<stat> PDU mode Text mode Explanation
0 “REC UNREAD” Received unread messages
1 “REC READ” Received read messages
2 “STO UNSENT” Stored unsent messages
3 “STO SENT” Stored sent messages
4 “ALL” All messages
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<length> Message length. Integer type, indicating in the text mode (+CMGF=1) the length of the
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 131 / 230
AT+CMGW now only supports Text mode in CDMA network.
Example
AT+CMGF=1 //Set SMS message format as text mode
OK
AT+CSCS=“GSM” //Set character set as GSM which is used by the TE
OK
AT+CMGW=“15021012496”
> <This is a test from Quectel> //Enter in text, <CTRL-Z> write message, <ESC> quits
without sending
+CMGW: 4
OK
AT+CMGF=0 //Set SMS message format as PDU mode
OK
AT+CMGW=18
> 0051FF00000008000A0500030002016D4B8BD5
+CMGW: 5
OK
9.11. AT+CMSS Send Message From Storage
AT+CMSS write command sends message with location value <index> from message storage <mem2>
to the network. If new recipient address <da> is given for SMS-SUBMIT, it shall be used instead of the
one stored with the message.
message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0), the
length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets are
not counted in the length).
<pdu> In the case of SMS: 3GPP TS 24.011 SC address followed by 3GPP TS 23.04TPDU in
hexadecimal format: ME/TA converts each octet of TP data unit into two IRA character
long hexadecimal number (e.g. octet with integer value 42 is presented to TE as two
characters 2A (IRA 50 and 65)).
<index> Index of message in selected storage <mem2>.
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 132 / 230
Parameter
AT+CMSS Send Message From Storage
Test Command
AT+CMSS=?
Response
OK
Write Command
AT+CMSS=<index>[,<da>[,<toda>]]
Response
TA sends message with location value <index> from
message storage <mem2> to the network (SMS-SUBMIT). If
new recipient address <da> is given, it shall be used instead
of the one stored with the message. Reference value <mr> is
returned to the TE on successful message delivery. Values
can be used to identify message upon unsolicited delivery
status report result code.
1) If text mode (+CMGF=1) and sent successfully:
+CMSS: <mr>[,<scts>]
OK
2) If PDU mode (+CMGF=0) and sent successfully:
+CMSS: <mr> [,<ackpdu>]
OK
3) If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
120s, determined by network.
Reference
3GPP TS 27.005
<index> Integer type, in the range of location numbers supported by the associated memory.
<da> Destination Address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are
converted to characters of the currently selected TE character set (refer to command
+CSCS in 3GPP TS 27.007); type of address is given by <toda>.
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<mr> Message reference. 3GPP TS 23.040 TP-Message-Reference in integer format.
<scts> Service center time stamp. 3GPP TS 23.040 TP-Service-Centre-Time-Stamp in
time-string format (refer to <dt>).
<ackpdu> Format is same for <pdu> in case of SMS, but without 3GPP TS 24.011 SC address
field and parameter shall be bounded by double quote characters like a normal string
type parameter.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 133 / 230
Example
AT+CMGF=1 //Set SMS message format as text mode
OK
AT+CSCS=“GSM” //Set character set as GSM which is used by the TE
OK
AT+CMGW=“15021012496”
> Hello //Enter in text, <CTRL+Z> send message, <ESC> quits
without sending
+CMGW: 4
OK
AT+CMSS=4 //Send the message of index is 4 from memory storage.
+CMSS: 54
OK
9.12. AT+CNMA New Message Acknowledgement to UE/TE (Not
Effective in CDMA Network)
AT+CNMA write and execute commands confirm successful receipt of a new message (SMS-DELIVER
or SMS-STATUS-REPORT) routed directly to the TE. If the UE does not receive acknowledgement within
required time (net-work timeout), it sends an “RP-ERROR” message to the network. The UE will
automatically disable routing to the TE by setting both <mt> and <ds> values of AT+CNMI to 0.
AT+CNMA New Message Acknowledgement to UE/TE (Not Effective in CDMA
Network)
Test Command
AT+CNMA=?
Response
+CNMA: (list of supported <n>s)
OK
Execution Command
AT+CNMA
Response
OK
ERROR
If error is related to ME functionality:
+CMS ERROR: <err>
Write Command
AT+CNMA=<n>
Response
OK
ERROR
If error is related to ME functionality:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 134 / 230
Parameter
<n> Parameter required only for PDU mode
0 Command operates similarly as in text mode
1 Send positive (RP-ACK) acknowledgement to the network. Accepted only in PDU mode
2 Send negative (RP-ERROR) acknowledgement to the network. Accepted only in PDU
mode
1. AT+CNMA is not effective in CDMA network.
2. Execute and write command shall only be used when AT+CSMS parameter <service> equals 1
+CMT for <mt>
+CMT for <mt>
+CDS for <ds>=1.
Example
AT+CSMS=1
OK
AT+CNMI=1,2,0,0,0
OK
+CMT: “+8615021012496”,,“13/03/18,17:07:21+32”,145,4,0,0,“+8613800551500”,145,28
This is a test from Quectel. //Short message is outputted directly when SMS is incoming.
AT+CNMA //Send ACK to the network
OK
AT+CNMA
+CMS ERROR：340 //The second time return error, it needs ACK only once
9.13. AT+CNMI SMS Event Reporting Configuration
AT+CNMI write command selects the procedure, how the received new messages from the network are
indicated to the TE when TE is active, e.g. DTR signal is ON. If TE is inactive (e.g. DTR signal is OFF),
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 135 / 230
message receiving should be done as specified in 3GPP TS 23.038.
Parameter
<mode> 0 Buffer unsolicited result codes in the TA. If TA result code buffer is full, indications
can be buffered in some other place or the oldest indications may be discarded
and replaced with the new received indications.
1 Discard indication and reject new received message unsolicited result codes
when TA-TE link is reserved (e.g. in on-line data mode). Otherwise forward them
directly to the TE.
2 Buffer unsolicited result codes in the TA when TA-TE link is reserved (e.g. in
on-line data mode) and flush them to the TE after reservation. Otherwise forward
them directly to the TE.
<mt> The rules for storing received SMS depend on its data coding scheme (refer to 3G
PPTS 23.038 ), preferred memory storage (+CPMS) setting and the value is:
0 No SMS-DELIVER indications are routed to the TE.
AT+CNMI SMS Event Reporting Configuration
Test Command
AT+CNMI=?
Response
+CNMI: (list of supported <mode>s),(list of supported
<mt>s),(list of supported <bm>s),(list of supported
<ds>s),(list of supported <bfr>s)
OK
Read Command
AT+CNMI?
Response
+CNMI: <mode>,<mt>,<bm>,<ds>,<bfr>
OK
Write Command
AT+CNMI[=<mode>[,<mt>[,<bm>[,<ds
>[,<bfr>]]]]]
Response
TA selects the procedure on how the received new messages
from the network are indicated to the TE when TE is active,
e.g. DTR signal is ON. If TE is inactive (e.g. DTR signal is
OFF), receiving message should be done as specified in
3GPP TS 23.038.
OK
ERROR
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 136 / 230
1 If SMS-DELIVER is stored into ME/TA, indication of the memory location is routed
to the TE by using unsolicited result code: +CMTI: <mem>,<index>
2 SMS-DELIVERs (except class 2) are routed directly to the TE using unsolicited
result code: +CMT: [<alpha>],<length><CR><LF><pdu> (PDU mode enabled)
or +CMT:<oa>,[<alpha>],<scts>[,<tooa>,<fo>,<pid>,<dcs>,<sca>,<tosca>,
<length>]<CR><LF><data> (Text mode enabled; about parameters in italics,
refer to Command Show Text Mode Parameters +CSDH) or ^HCMT:
<oa>,<scts>,<lang>,<fmt>,<length>,<prt>,<prv>,<type>,<stat><CR><LF><da
ta>(Text mode for CDMA SMS).Class 2 messages result in indication as defined
in <mt>=1.
3 Class 3 SMS-DELIVERs are routed directly to TE by using unsolicited result
codes defined in <mt>=2. Messages of other classes result in indication as
defined in <mt>=1.
<bm> The rules for storing received CBMs depend on its data coding scheme (refer to 3
GPP TS 23.038), the setting of Select CBM Types (+CSCB) and the value is:
0 No CBM indications are routed to the TE.
2 New CBMs are routed directly to the TE using unsolicited result code:
+CBM: <length><CR><LF><pdu> (PDU mode); or
+CBM: <sn>,<mid>,<dcs>,<page>,<pages><CR><LF><data> (text mode)
<ds> 0 No SMS-STATUS-REPORTs are routed to the TE.
1 SMS-STATUS-REPORTs are routed directly to the TE.
2 If SMS-STATUS-REPORT is stored into ME/TA, indication of the memory
location is routed to the TE
<bfr> 0 TA buffer of unsolicited result codes defined within this command is flushed to the
TE when <mode> 1...2 is entered (“OK” response shall be given before flushing
the codes).
1 TA buffer of unsolicited result codes defined within this command is cleared when
<mode> 1...2 is entered.
Unsolicited result code:
+CMTI: <mem>,<index> Indicates that new message has been received
+CMT: [<alpha>],<length><CR><LF><pdu> Short message is outputted directly
+CBM: <length><CR><LF><pdu> Cell broadcast message is outputted directly
Example
AT+CMGF=1 //Set SMS message format as text mode
OK
AT+CSCS=“GSM” //Set character set as GSM which is used by the TE
OK
AT+CNMI=1,2,0,1,0 //Set SMS-DELIVERs are routed directly to the TE
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 137 / 230
OK
+CMT: “+8615021012496”,,“15/03/18,17:07:21+32”,145,4,0,0,“+8613800551500”,145,28
This is a test from Quectel. //Short message is outputted directly when SMS is incoming.
9.14. AT+CSCB Select Cell Broadcast Message Types (Not Effective in
CDMA Network)
AT+CSCB write command selects which types of CBMs are to be received by the ME. The command
writes the parameters in NON-VOLATILE memory.
Parameter
AT+CSCB Select Cell Broadcast Message Types (Not Effective in CDMA Network)
Test Command
AT+CSCB=?
Response
It returns supported modes as a compound value.
+CSCB: (list of supported <mode>s)
OK
Read Command
AT+CSCB?
Response
+CSCB : <mode>,<mids>,<dcss>
OK
Write Command
AT+CSCB=<mode>[,<mids>[,<dcss>]
]
Response
TA selects which types of CBMs are to be received by the ME.
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<mode> 0 Message types specified in <mids> and <dcss> are accepted
1 Message types specified in <mids> and <dcss> are not accepted
<mids> String type, all different possible combinations of CBM message identifiers (refer to <mid>)
(default is empty string), e.g. “0,1,5,320-478,922”
<dcss> String type, all different possible combinations of CBM data coding schemes (refer to
<dcs>) (default is empty string), e.g. “0-3,5”
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 138 / 230
9.15. AT+CSDH Show SMS Text Mode Parameters (Not Effective in
CDMA Network)
AT+CSDH write command controls whether detailed header information is shown in text mode result
codes.
Parameter
<show> 0 Do not show header values defined in commands +CSCA, +CSMP (<sca>,
<tosca>, <fo>, <vp>, <pid>, <dcs>) and <length>, <toda> or <tooa> in +CMT,
+CMGL, +CMGR result codes for SMS-DELIVERs and SMS-SUBMITs in text
mode
1 Show the values in result codes
Example
AT+CSDH=0
OK
AT+CMGR=2
+CMGR: “STO UNSENT” ,“”,
<This is a test from Quectel>
OK
AT+CSDH=1
OK
AT+CSDH Show SMS Text Mode Parameters (Not Effective in CDMA Network)
Test Command
AT+CSDH=?
Response
+CSDH: (list of supported <show>s)
OK
Read Command
AT+CSDH?
Response
+CSDH: <show>
OK
Write Command
AT+CSDH[=<show>]
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.005
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 139 / 230
AT+CMGR=2
+CMGR: “STO UNSENT”,“”,,128,17,0,0,143,“+8613800551500”,145,18
<This is a test from Quectel>
OK
9.16. AT+CSMP Set SMS Text Mode Parameters (Not Effective in CDMA
Network)
AT+CSMP is used to set values for additional parameters needed when a short message is sent to the
network or placed in a storage in text mode.
Parameter
AT+CSMP Set SMS Text Mode Parameters (Not Effective in CDMA Network)
Test Command
AT+CSMP=?
Response
OK
Read Command
AT+CSMP?
Response
+CSMP: <fo>,<vp>,<pid>,<dcs>
OK
Write Command
AT+CSMP=<fo>[,<vp>[,<pid>[,<dcs>]]
]
Response
TA selects values for additional parameters needed when SM
is sent to the network or placed in a storage when text mode
is selected (+CMGF=1). It is possible to set the validity period
starting from when the SM is received by the SMSC (<vp> is
in range 0... 255) or define the absolute time of the validity
period termination (<vp> is a string).
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.005
<fo> First octet. Depending on the command or result code: First octet of 3GPP TS 23.040
SMS-DELIVER, SMS-SUBMIT (default 17), SMS-STATUS-REPORT, SMS-COMMAND
in integer format. If a valid value has been entered once, parameter can be omitted.
<vp> Validity period. Depending on SMS-SUBMIT <fo> setting: 3GPP TS 23.040
TP-Validity-Period either in integer format or in time-string format (refer to <dt>).
<pid> Protocol identifier. 3GPP TS 23.040 TP-Protocol-Identifier in integer format (default 0).
<dcs> Data coding scheme. Depending on the command or result code: 3GPP TS 23.038
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 140 / 230
9.17. AT+QCSMP Set CDMA SMS Text Mode Parameters
AT+QCSMP is used to set values for additional parameters needed when a short message is sent to the
network or placed in a storage in text mode.
Parameter
SMS Data Coding Scheme (default 0), or Cell Broadcast Data Coding Scheme in
integer format.
AT+QCSMP Set CDMA SMS Text Mode Parameters
Test Command
AT+QCSMP=?
Response
OK
Read Command
AT+QCSMP?
Response
+CSMP: <ack>,<prt>,<fmt>,<prv>,<lang>
OK
Write Command
AT+QCSMP=<ack>,<prt>,<fmt>,<prv>
,<lang>
Response
OK
Maximum Response Time
300ms
Reference
Quectel
<ack> Status Report.
0 Not need status report
1 Need status report
<prt> Priority
0 Normal
1 Interactive
2 Urgent
3 Emergency
<fmt> Format
0 GSM 7 bit
1 ASCII
6 UNICODE
<prv> Privacy
0 Normal
1 Restricted
2 Confidential
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 141 / 230
9.18. AT+QSMSR Read Message
AT+QSMSR read command returns SMS message with location value <index> from message storage
<mem1> to the TE. If status of the message is “REC UNREAD”, status in the storage changes to “REC
READ”.
3 Secret
<lang> Language
0 Unspecified
1 English
2 French
3 Spanish
4 Japanese
5 Korean
6 Chinese
7 Hebrew
AT+QSMSR Read Message
Test Command
AT+QSMSR=?
Response
OK
Write Command
AT+QSMSR=<index>
Response
TA returns SMS message with location value <index> from
message storage <mem1> to the TE. If status of the
message is “REC UNREAD”, status in the storage changes to
“REC READ”.
In Non-CDMA mode:
If text mode (+CMGF=1) and command is executed
successfully:
For SMS-DELIVER:
+QSMSR:
<smstype>,<stat>,<oa>,[<alpha>],<scts>[,<tooa>,<fo>,<p
id>,<dcs>,<sca>,<tosca>,<length>]<CR><LF><data>
OK
For SMS-SUBMIT:
+QSMSR:
<smstype>,<stat>,<da>,[<alpha>][,<toda>,<fo>,<pid>,<dc
s>,[<vp>],<sca>,<tosca>,<length>]<CR><LF><data>
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 142 / 230
For SMS-STATUS-REPORTs:
+QSMSR:
<smstype>,<stat>,<fo>,<mr>,[<ra>],[<tora>],<scts>,<dt>,
<st>
OK
For SMS-COMMANDs:
+QSMSR:
<smstype>,<stat>,<fo>,<ct>[,<pid>,[<mn>],[<da>],[<toda
>],<length><CR><LF><cdata>]
OK
For CBM storage:
+QSMSR:
<smstype>,<stat>,<sn>,<mid>,<dcs>,<page>,<pages><C
R><LF><data>
OK
If PDU mode (+CMGF=0) and command successful:
+QSMSR:
<smstype>, <stat>,[<alpha>],<length><CR><LF><pdu>
OK
In CDMA Text mode:
+QSMSR:
<smstype>,<stat>,<oa/da>,<scts>,<alpha>,<tooa/toda>,<l
ang>,<fmt>,<length>,<prt>,<prv>,<type><CR><LF><data
>
OK
If error is related to ME functionality:
+CMS ERROR: <err>
Maximum Response Time
Depends on the length of message content.
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 143 / 230
Parameter
<smstype> SMS type
0 CDMA SMS
1 Non-CDMA SMS
<index> Integer type, in the range of location numbers supported by the associated memory
<stat> PDU mode Text mode Explanation
0 “REC UNREAD” Received unread messages
1 “REC READ” Received read messages
2 “STO UNSENT” Stored unsent messages
3 “STO SENT” Stored sent messages
4 “ALL” All messages
<alpha> String type alphanumeric representation of <da> or <oa> corresponding to the entry
found in MT phonebook; implementation of this feature is manufacturer specified; the
used character set should be the one selected with command Select TE Character Set
+CSCS (see definition of this command in 3GPP TS 27.007).
<da> Destination address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
3GPP TS 27.007 ); type of address is given by <toda>.
<oa> Originating address. 3GPP TS 23.040 TP-Originating-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in TS
27.007); type of address is given by <tooa>.
<scts> Service center time stamp. 3GPP TS 23.040 TP-Service-Centre-Time-Stamp in
time-string format (refer to <dt>).
<fo> First octet. Depending on the command or result code: First octet of 3GPP TS 23.040
SMS-DELIVER, SMS-SUBMIT (default 17), SMS-STATUS-REPORT, or
SMS-COMMAND in integer format. If a valid value has been entered once, parameter
can be omitted.
<pid> Protocol identifier. 3GPP TS 23.040 TP-Protocol-Identifier in integer format (default
0).
<dcs> Data coding scheme. Depending on the command or result code: 3GPP TS 23.038
SMS Data Coding Scheme (default 0), or Cell Broadcast Data Coding Scheme in
integer format.
<vp> Validity period. Depending on SMS-SUBMIT <fo> setting: 3GPP TS 23.040
TP-Validity-Period either in integer format or in time-string format (refer to <dt>).
<mn> Message number. 3GPP TS 23.040 TP-Message-Number in integer format.
<mr> Message reference. 3GPP TS 23.040 TP-Message-Reference in integer format.
<ra> Recipient address. 3GPP TS 23.040 TP-Recipient-Address Address-Value field in
string format; BCD numbers (or GSM default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command AT+CSCS.);
type of address given by <tora>.
<tora> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 144 / 230
octet in integer format (default refer <toda>).
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<tooa> Type of originating address.3GPP TS 24.011 TP-Originating-Address Type-of-Address
octet in integer format (default refer to <toda>).
<sca> Service center address. 3GPP TS 24.011 RP SC address Address-Value field in string
format; BCD numbers (or GSM 7 bit default alphabet characters) are converted to
characters of the currently selected TE character set (refer to command +CSCS in
3GPP TS 27.007 ); type of address is given by <tosca>.
<tosca> Type of service center address. 3GPP TS 24.011 RP SC address Type-of-Address octet
in integer format (default refer to <toda>).
<length> Message length, integer type, indicating in the text mode (+CMGF=1) the length of the
message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0), the
length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets are
not counted in the length).
<data> The text of short message. Please refer 14.8 SMS Character Sets Conversions for the
detail.
<pdu> In the case of SMS: 3GPP TS 24.011 SC address followed by 3GPP TS 23.040 TPDU
in hexadecimal format: ME/TA converts each octet of TP data unit into two IRA
character long hexadecimal number (e.g. octet with integer value 42 is presented to TE
as two characters 2A (IRA 50 and 65))3GPP TS 27.007.
<prt> Priority
0 Normal
1 Interactive
2 Urgent
3 Emergency
<fmt> Format
0 GSM 7 bit
1 ASCII
6 UNICODE
<prv> Privacy
0 Normal
1 Restricted
2 Confidential
3 Secret
<lang> Language
0 Unspecified
1 English
2 French
3 Spanish
4 Japanese
5 Korean
6 Chinese
7 Hebrew
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 145 / 230
AT+QSMSR now only supports Text mode in CDMA network.
9.19. AT+QSMSL List Messages
AT+QSMSL read command returns messages with status value <stat> from preferred message storage
<mem1> to the TE. If the status of the message is “REC UNREAD”, the status in the storage changes to
“REC READ”. When executing command AT+QSMSL without status value <stat>, it will report the list of
SMS with “REC UNREAD” status.
<type> 0 Normal
1 CPT
2 Voice Mail
3 SMS Report
AT+QSMSL List Messages
Test Command
AT+QSMSL=?
Response
+QSMSL: (list of supported <stat>s)
OK
Write Command
AT+QSMSL[=<stat>]
Response
In Non-CDMA mode:
If text mode (+CMGF=1) and command successful:
For SMS-SUBMITs and/or SMS-DELIVERs:
+QSMSL:
<smstype>,<index>,<stat>,<oa/da>,[<alpha>],[<scts>][,<t
ooa/toda>,<length>]<CR><LF><data>[<CR><LF>
+QSMSL:
<smstype>,<index>,<stat>,<da/oa>,[<alpha>],[<scts>][,<t
ooa/toda>,<length>]<CR><LF><data>[...]]
For SMS-STATUS-REPORTs:
+QSMSL:
<smstype>,<index>,<stat>,<fo>,<mr>,[<ra>],[<tora>],<sct
s>,<dt>,<st>[<CR><LF>
+QSMSL:
<smstype>,<index>,<stat>,<fo>,<mr>,[<ra>],[<tora>],<sct
s>,<dt>,<st>[...]]
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 146 / 230
For SMS-COMMANDs:
+QSMSL:
<smstype>,<index>,<stat>,<fo>,<ct>[<CR><LF>
+QSMSL: <smstype>,<index>,<stat>,<fo>,<ct>[...]]
For CBM storage:
+QSMSL:<smstype>,<index>,<stat>,<sn>,<mid>,<page>,
<pages><CR><LF><data>[<CR><LF>
+QSMSL:
<smstype>,<index>,<stat>,<sn>,<mid>,<page>,<pages><
CR><LF><data>[...]]
OK
Else If PDU mode (+CMGF=0) and command successful:
+QSMSL:<smstype>,<index>,<stat>,[<alpha>],<length><
CR><LF><pdu><CR><LF>
+QSMSL:
<smstype>,<index>,<stat>,[alpha],<length><CR><LF><p
du>[...]]
OK
In CDMA Text mode:
+QSMSL:
<smstype>,<index>,<stat>,<oa/da>,<scts>,<alpha>,<tooa
/toda>,<length><CR><LF><data>[<CR><LF>]
OK
Else if error is related to ME functionality:
+CMS ERROR: <err>
Execution Command
AT+QSMSL
Response
List all messages with “REC UNREAD” status from message
storage <mem1>, then status in the storage changes to “REC
READ”.
Maximum Response Time
300ms.
Note: Operation of <stat> depends on the storage of listed
messages.
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 147 / 230
Parameter
<smstype> SMS type
0 CDMA SMS
1 Non-CDMA SMS
<stat> In text mode:
“REC UNREAD” Received unread messages
“REC READ” Received read messages
“STO UNSENT” Stored unsent messages
“STO SENT” Stored sent messages
“ALL” All messages
In PDU mode:
0 Received unread messages
1 Received read messages
2 Stored unsent messages
3 Stored sent messages
4 All messages
<index> Integer type, in the range of location numbers supported by the associated memory
<da> Destination Address. 3GPP TS 23.040 TP-Destination-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are
converted to characters of the currently selected TE character set (refer to command
+CSCS in 3GPP TS 27.007 ); type of address is given by <toda>.
<oa> Originating address. 3GPP TS 23.040 TP-Originating-Address Address-Value field in
string format; BCD numbers (or GSM 7 bit default alphabet characters) are converted
to characters of the currently selected TE character set (refer to command +CSCS in
TS 27.007); type of address is given by <tooa>.
<alpha> String type alphanumeric representation of <da> or <oa> corresponding to the entry
found in MT phonebook; implementation of this feature is manufacturer specified; the
used character set should be the one selected with command Select TE Character Set
+CSCS (see definition of this command in 3GPP TS 27.007).
<scts> Service centre time stamp. 3GPP TS 23.040 TP-Service-Centre-Time-Stamp in
time-string format (refer to <dt>).
<toda> Type of recipient address. 3GPP TS 24.011 TP-Recipient-Address Type-of-Address
octet in integer format.
<tooa> Type of originating address. 3GPP TS 24.011 TP-Originating-Address
Type-of-Address octet in integer format (default refer to <toda>).
<length> Message length, integer type, indicating in the text mode (+CMGF=1) the length
of the message body <data> (or <cdata>) in characters; or in PDU mode (+CMGF=0),
the length of the actual TP data unit in octets (i.e. the RP layer SMSC address octets
are not counted in the length).
<data> In the case of SMS: 3GPP TS 23.040 TP-User-Data in text mode responses; format:
- If <dcs>, indicates that 3GPP TS 23.038 GSM 7 bit default alphabet is used and
<fo> indicates that 3GPP TS 23.040 TP-User-Data-Header-Indication is not set.
- If TE character set other than “HEX” (refer to command Select TE Character Set
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 148 / 230
AT+QSMSL now only supports Text mode in CDMA network.
+CSCS in 3GPP TS 27.007): ME/TA converts GSM alphabet into current TE
character set according to rules of Annex A.
- If TE character set is “HEX”: ME/TA converts each 7-bit character of GSM 7 bit
default alphabet into two IRA character long hexadecimal number (e.g. character
(GSM 7 bit default alphabet 23) is presented as 17 (IRA 49 and 55)).
- If <dcs>, indicates that 8-bit or UCS2 data coding scheme is used, or <fo>
indicates that 3GPP TS 23.040 TP-User-Data-Header-Indication is set: ME/TA
converts each 8-bit octet into two IRA character long hexadecimal number (e.g.
octet with integer value 42 is presented to TE as two characters 2A (IRA 50 and
65)).
In the case of CBS: 3GPP TS 23.041 CBM Content of Message in text mode
responses; format:
- If <dcs>, indicates that 3GPP TS 23.038 GSM 7 bit default alphabet is used:
- If TE character set other than “HEX” (refer to command +CSCS in 3GPP
TS27.007): ME/TA converts GSM alphabet into current TE character set according
to rules of Annex A.
- If TE character set is “HEX”: ME/TA converts each 7-bit character of the GSM 7 bit
default alphabet into two IRA character long hexadecimal number.
- If <dcs>, indicates that 8-bit or UCS2 data coding scheme is used: ME/TA converts
each 8-bit octet into two IRA character long hexadecimal number.
<pdu> In the case of SMS: 3GPP TS 24.011 SC address followed by 3GPP TS 23.040 TPDU
in hexadecimal format: ME/TA converts each octet of TP data unit into two IRA
character long hexadecimal number (e.g. octet with integer value 42 is presented to
TE as two characters 2A (IRA 50 and 65))3GPP TS 27.007.
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 149 / 230
10 Packet Domain Commands
10.1. AT+CGATT Attachment or Detachment of PS
The AT+CGATT write command is used to attach the MT to, or detach the MT from the Packet Domain
service. After the command has completed, the MT remains in V.25ter command state. If the MT is
already in the requested state, the command is ignored and the OK response will be returned. If the
requested state cannot be achieved, an ERROR or +CME ERROR response is returned.
Parameter
AT+CGATT Attachment or Detachment of PS
Test Command
AT+CGATT=?
Response
+CGATT: (list of supported <state>s)
OK
Read Command
AT+CGATT?
Response
+CGATT: <state>
OK
Write Command
AT+CGATT=<state>
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
140s, determined by network.
Reference
3GPP TS 27.007
<state> Indicates the state of PS attachment
0 Detached
1 Attached
Other values are reserved and will result in an ERROR response to the Write Command
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 150 / 230
Example
AT+CGATT=1 //Attach to PS service
OK
AT+CGATT=0 //Detach from PS service
OK
AT+CGATT? //Query the current PS service state
+CGATT: 0
OK
10.2. AT+CGDCONT Define PDP Context
AT+CGDCONT specifies PDP context parameters for a specific context <cid>. A special form of the write
command (AT+CGDCONT=<cid>) causes the values for context <cid> to become undefined. It is not
allowed to change the definition of an already activated context.
The AT+CGDCONT read command returns the current settings for each defined PDP context.
AT+CGDCONT Define PDP Context
Test Command
AT+CGDCONT=?
Response
+CGDCONT: (range of supported <cid>s),<PDP_type>,
<APN>, <PDP_addr>,(list of supported <data_comp>s),(list
of supported <head_comp>s)
OK
Read Command
AT+CGDCONT?
Response
[+CGDCONT:
<cid>,<PDP_type>,<APN>,<PDP_addr>,<data_comp>,<h
ead_comp>][…]
OK
Write Command
AT+CGDCONT=<cid>[,<PDP_type>[,<
APN>[,<PDP_addr>[,<data_comp>[,<
head_comp>]]]]]
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 151 / 230
Parameter
<cid> PDP context identifier, a numeric parameter which specifies a particular PDP context
definition. The parameter is local to the TE-MT interface and is used in other PDP
context-related commands. The range of permitted values (minimum value=1) is
returned by the test form of the command.
<PDP_type> Packet data protocol type, a string parameter which specifies the type of packet data
protocol.
“IP” Internet Protocol (IPV4)
“PPP”
“IPV6”
“IPV4V6”
<APN> Access point name, a string parameter that is a logical name that is used to select the
GGSN or the external packet data network. If the value is null or omitted, then the
subscription value will be requested.
<PDP_addr> A string parameter identifies the MT in the address space applicable to the PDP. If the
value is null or omitted, then a value may be provided by the TE during the PDP startup
procedure or, failing that, a dynamic address will be requested. The allocated address
may be read using the +CGPADDR command.
<data_comp> A numeric parameter that controls PDP data compression (applicable for SNDCP only)
(refer to 3GPP TS 44.065).
0 Off (Default if value is omitted)
1 On (Manufacturer preferred compression)
2 V.42bis
<head_comp> A numeric parameter that controls PDP header compression (refer to 3GPP TS 44.065
and 3GPP TS 25.323).
0 Off
1 On
2 RFC1144
3 RFC2507
4 RFC3095
10.3. AT+CGQREQ Quality of Service Profile (Requested)
AT+CGQREQ allows the TE to specify a quality of service profile that is used when the MT activates a
PDP context.
The write command specifies a profile for the context <cid>. A special form of the write command,
AT+CGQREQ=<cid> causes the requested profile for context number <cid> to become undefined. The
read command returns the current settings for each defined context. Details can be found in 3GPP TS
23.107 and all of parameters save in NV automatically.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 152 / 230
Parameter
AT+CGQREQ Quality of Service Profile (Requested)
Test Command
AT+CGQREQ=?
Response
+CGQREQ: <PDP_type>,
(list of supported <precedence>s),
(list of supported <delay>s),
(list of supported <reliability>s),
(list of supported <peak>s),
(list of supported <mean>s)
OK
Read Command
AT+CGQREQ?
Response
[+CGQREQ:
<cid>,<precedence>,<delay>,<reliability>,<peak>,<mean
>]
[…]
OK
Write Command
AT+CGQREQ=<cid>[,<precedence>[,
<delay>[,<reliability>[,<peak>[,<mean
>]]]]]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<cid> A numeric parameter which specifies a particular PDP context definition (see
+CGDCONT command)
<PDP_type> Packet Data Protocol type
“IP” Internet Protocol (IETF STD 5)
“PPP”
“IPV6”
“IPV4V6”
<precedence> A numeric parameter which specifies the precedence class
0 Network subscribed value
1 High Priority. Service commitments shall be maintained ahead of precedence
classes 2 and 3
2 Normal priority. Service commitments shall be maintained ahead of
precedence class 3
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 153 / 230
3 Low priority. Service commitments shall be maintained
<delay> A numeric parameter which specifies the delay class. This parameter defines the
end-to-end transfer delay incurred in the transmission of SDUs through the network.
For the detail please refer to Table 5: Delay Class.
0 Network subscribed value
<reliability> A numeric parameter which specifies the reliability class
0 Network subscribed value
1 Non real-time traffic, error-sensitive application that cannot cope with data loss
2 Non real-time traffic, error-sensitive application that can cope with in frequent
data loss
3 Non real-time traffic, error-sensitive application that can cope with data loss,
GMM/SM, and SMS
4 Real-time traffic, error-sensitive application that can cope with data loss
5 Real-time traffic, error non-sensitive application that can cope with data loss
<peak> A numeric parameter which specifies the peak throughput class, in octets per second.
0 Network subscribed value
1 Up to 1 000 (8 kbit/s)
2 Up to 2 000 (16 kbit/s)
3 Up to 4 000 (32 kbit/s)
4 Up to 8 000 (64 kbit/s)
5 Up to 16 000 (128 kbit/s)
6 Up to 32 000 (256 kbit/s)
7 Up to 64 000 (512 kbit/s)
8 Up to 128 000 (1024 kbit/s)
9 Up to 256 000 (2048 kbit/s)
<mean> A numeric parameter which specifies the mean throughput class, in octets per hour.
0 Network subscribed value
1 100 (~0.22 bit/s)
2 200 (~0.44 bit/s)
3 500 (~1.11 bit/s)
4 1 000 (~2.2 bit/s)
5 2 000 (~4.4 bit/s)
6 5 000 (~11.1 bit/s)
7 10 000 (~22 bit/s)
8 20 000 (~44 bit/s)
9 50 000 (~111 bit/s)
10 100 000 (~0.22 kbit/s)
11 200 000 (~0.44 kbit/s)
12 500 000(~1.11 kbit/s)
13 1000 000 (~2.2 kbit/s)
14 2 000 000 (~4.4 kbit/s)
15 5 000 000 (~11.1 kbit/s)
16 10 000 000 (~22 kbit/s)
17 20 000 000 (~44 kbit/s)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 154 / 230
Table 5: Delay Class
10.4. AT+CGQMIN Quality of Service Profile (Minimum Acceptable)
AT+CGQMIN allows the TE to specify a minimum acceptable profile which is checked by the MT against
the negotiated profile when the PDP context is activated. The write command specifies a profile for the
context identified by the context identification parameter <cid>.
A special form of the write command, AT+CGQMIN=<cid> causes the minimum acceptable profile for
context number <cid> to become undefined. In this case no check is made against the negotiated profile.
The read command returns the current settings for each defined context. Details can be found in 3GPP
TS 23.107 and all of parameters save in NV automatically.
18 50 000 000 (~111 kbit/s)
31 Best effort
SDU Size
Delay Class
Mean Transfer Delay
95 Percentile
128 octets
1 (Predictive)
<0.5
<1.5
2 (Predictive)
<5
<25
3 (Predictive)
<50
<250
4 (Best Effort)
Unspecified
-
1024 octets
1 (Predictive)
<0.5
<1.5
2 (Predictive)
<5
<25
3 (Predictive)
<50
<250
4 (Best Effort)
Unspecified
-
AT+CGQMIN Quality of Service Profile (Minimum Acceptable)
Test Command
AT+CGQMIN=?
Response
+CGQMIN: <PDP_type>,
(list of supported <precedence>s),
(list of supported <delay>s),
(list of supported <reliability>s),
(list of supported <peak>s),
(list of supported <mean>s)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 155 / 230
Parameter
OK
Read Command
AT+CGQMIN?
Response
[+CGQMIN:
<cid>,<precedence>,<delay>,<reliability>,<peak>,<mean
>]
[…]
OK
Write Command
AT+CGQMIN=<cid>[,<precedence>[,<
delay>[,<reliability>[,<peak>[,<mean>
]]]]]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<cid> A numeric parameter which specifies a particular PDP context definition (see
+CGDCONT command)
<PDP_type> Packet Data Protocol type
“IP” Internet Protocol (IETF STD 5)
“PPP”
“IPV6”
“IPV4V6”
<precedence> A numeric parameter which specifies the precedence class
0 Network subscribed value
1 High Priority. Service commitments shall be maintained ahead of precedence
classes 2 and 3
2 Normal priority. Service commitments shall be maintained ahead of
precedence class 3
3 Low priority. Service commitments shall be maintained
<delay> A numeric parameter which specifies the delay class. This parameter defines the
end-to-end transfer delay incurred in the transmission of SDUs through the network.
For the detail please refer to Table 5: Delay Class
0 Network subscribed value
<reliability> A numeric parameter which specifies the reliability class.
0 Network subscribed value
1 Non real-time traffic, error-sensitive application that cannot cope with data
loss
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 156 / 230
2 Non real-time traffic, error-sensitive application that can cope with infrequent
data loss3
3 Non real-time traffic, error-sensitive application that can cope with data loss,
GMM/SM, and SMS
4 Real-time traffic, error-sensitive application that can cope with data loss
5 Real-time traffic, error non-sensitive application that can cope with data loss
<peak> A numeric parameter which specifies the peak throughput class, in octets per second.
0 Network subscribed value
1 Up to 1 000 (8 kbit/s)
2 Up to 2 000 (16 kbit/s)
3 Up to 4 000 (32 kbit/s)
4 Up to 8 000 (64 kbit/s)
5 Up to 16 000 (128 kbit/s)
6 Up to 32 000 (256 kbit/s)
7 Up to 64 000 (512 kbit/s)
8 Up to 128 000 (1024 kbit/s)
9 Up to 256 000 (2048 kbit/s)
<mean> A numeric parameter which specifies the mean throughput class, in octets per hour.
0 Network subscribed value
1 100 (~0.22 bit/s)
2 200 (~0.44 bit/s)
3 500 (~1.11 bit/s)
4 1 000 (~2.2 bit/s)
5 2 000 (~4.4 bit/s)
6 5 000 (~11.1 bit/s)
7 10 000 (~22 bit/s)
8 20 000 (~44 bit/s)
9 50 000 (~111 bit/s)
10 100 000 (~0.22 kbit/s)
11 200 000 (~0.44 kbit/s)
12 500 000(~1.11 kbit/s)
13 1000 000 (~2.2 kbit/s)
14 2 000 000 (~4.4 kbit/s)
15 5 000 000 (~11.1 kbit/s)
16 10 000 000 (~22 kbit/s)
17 20 000 000 (~44 kbit/s)
18 50 000 000 (~111 kbit/s)
31 Best effort
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 157 / 230
10.5. AT+CGEQREQ 3G Quality of Service Profile (Requested)
AT+CGEQREQ allows the TE to specify a UMTS Quality of Service Profile that is used when the MT
activates a PDP context. Details can be found in 3GPP TS 23.107 and all of parameters save in NV
automatically.
AT+CGEQREQ 3G Quality of Service Profile (Requested)
Test Command
AT+CGEQREQ=?
Response
+CGEQREQ: <PDP_type>,
(list of supported <Traffic class>s),
(list of supported <Maximum bitrate UL>s),
(list of supported <Maximum bitrate DL>s),
(list of supported <Guaranteed bitrate UL>s),
(list of supported <Guaranteed bitrate DL>s),
(list of supported <Delivery order>s),
(list of supported <Maximum SDU size>s),
(list of supported <SDU error ratio>s),
(list of supported <Residual bit error ratio>s),
(list of supported <Delivery of erroneous SDUs>s),
(list of supported <Transfer delay>s),
(list of supported <Traffic handling priority>s),
(list of supported <Source statistics descriptor>s),
(list of supported <Signalling indication>s)
OK
Read Command
AT+CGEQREQ?
Response
[+CGEQREQ: <cid>,
<Traffic class>,
<Maximum bitrate UL>,
<Maximum bitrate DL>,
<Guaranteed bitrate UL>,
<Guaranteed bitrate DL>,
<Delivery order>,
<Maximum SDU size>,
<SDU error ratio>,
<Residual bit error ratio>,
<Delivery of erroneous SDUs>,
<Transfer delay>,
<Traffic handling priority>,
<Source statistics descriptor>,
<Signalling indication>]
[...]
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 158 / 230
Parameter
OK
Write Command
AT+CGEQREQ=[<cid>[,<Traffic
class>[,<Maximum bitrate UL>
[,<Maximum bitrate DL>
[,<Guaranteed bitrate UL>
[,<Guaranteed bitrate DL>
[,<Delivery order>
[,<Maximum SDU size>
[,<SDU error ratio>
[,<Residual bit error ratio>
[,<Delivery of erroneous SDUs>
[,<Transfer delay>
[,<Traffic handling priority>
[,<Source statistics descriptor>
[,<Signalling indication>]]]]]]]]]]]]]]]
Response
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<cid> A numeric parameter which specifies a particular PDP context
definition (see +CGDCONT command)
<PDP_type> Packet data protocol type, a string parameter which specifies the type
of packet data protocol
“IP” Internet Protocol (IPV4)
“PPP”
“IPV6”
“IPV4V6”
The following parameters are defined in 3GPP TS 23.107
<Traffic class> Integer type, indicates the type of application for which the UMTS
bearer service is optimized (refer to 3GPP TS 24.008 subclause
10.5.6.5). If the Traffic class is specified as conversational or
streaming, then the Guaranteed and Maximum bitrate parameters
should also be provided.
0 Conversational
1 Streaming
2 Interactive
3 Background
4 Subscribed value
<Maximum bitrate UL> Integer type, indicates the maximum number of kbits/s delivered to
UMTS (up-link traffic) at a SAP. As an example a bit rate of 32kbit/s
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 159 / 230
would be specified as „32‟ (e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~5760
<Maximum bitrate DL> Integer type, indicates the maximum number of kbits/s delivered by
UMTS (down-link traffic) at a SAP. As an example a bitrate of 32kbit/s
would be specified as „32‟ (e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~42200
<Guaranteed bitrate UL> Integer type, indicates the guaranteed number of kbits/s delivered to
UMTS (up-link traffic) at a SAP (provided that there is data to deliver).
As an example a bitrate of 32kbit/s would be specified as „32‟ (e.g.
AT+CGEQREQ=…,32, …).
0 Subscribed value
1~5760
<Guaranteed bitrate DL> Integer type, indicates the guaranteed number of kbits/s delivered by
UMTS (down-link traffic) at a SAP (provided that there is data to
deliver). As an example a bitrate of 32kbit/s would be specified as „32‟
(e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~42200
<Delivery order> Integer type, indicates whether the UMTS bearer shall provide
in-sequence SDU delivery or not (refer to 3GPP TS 24.008 subclause
10.5.6.5).
0 No
1 Yes
2 Subscribed value
<Maximum SDU size> Integer type, (1,2,3,…) indicates the maximum allowed SDU size in
octets. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 subclause 10.5.6.5).
0 Subscribed value
10...1520 (Value needs to be divisible by 10 without remainder)
1520
<SDU error ratio> String type, indicates the target value for the fraction of SDUs lost or
detected as erroneous. SDU error ratio is defined only for conforming
traffic. The value is specified as „mEe‟. As an example a target SDU
error ratio of 5*10-3 would be specified as “5E3” (e.g.
AT+CGEQREQ=…,”5E3”,…).
“0E0” Subscribed value
“1E1”
“1E2”
“7E3”
“1E3”
“1E4”
“1E5”
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 160 / 230
“1E6”
<Residual bit error ratio> String type, indicates the target value for the undetected bit error ratio
in the delivered SDUs. If no error detection is requested, Residual bit
error ratio indicates the bit error ratio in the delivered SDUs. The value
is specified as “mEe”. As an example a target residual bit error ratio of
5•10-3 would be specified as “5E3” (e.g. AT+CGEQREQ=…,“5E3”,…).
“0E0” Subscribed value
“5E2”
“1E2”
“5E3”
“4E3”
“1E3”
“1E4”
“1E5”
“1E6”
“6E8”
<Delivery of erroneous SDUs> Integer type, indicates whether SDUs detected as erroneous shall be
delivered or not (refer to 3GPP TS 24.008 [8] subclause 10.5.6.5).
0 No
1 Yes
2 No detect
3 Subscribed value
<Transfer delay> Integer type, (0,1,2,…) indicates the targeted time between request to
transfer an SDU at one SAP to its delivery at the other SAP, in
milliseconds. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 subclause 10.5.6.5).
0 Subscribed value
100~150 (value needs to be divisible by 10 without remainder)
200~950 (value needs to be divisible by 50 without remainder)
1000~4000 (value needs to be divisible by 100 without remainder)
<Traffic handling priority> Integer type, (1,2,3,…) specifies the relative importance for handling of
all SDUs belonging to the UMTS bearer compared to the SDUs of
other bearers. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 [8] subclause 10.5.6.5).
0 Subscribed
1
2
3
<Source Statistics Descriptor> Integer type, specifies characteristics of the source of the submitted
SDUs for a PDP context.
0 Characteristics of SDUs is unknown
1 Characteristics of SDUs corresponds to a speech source
<Signalling Indication> Integer type, indicates signaling content of submitted SDUs for a PDP
context.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 161 / 230
10.6. AT+CGEQMIN 3G Quality of Service Profile (Minimum Acceptable)
AT+CGEQMIN allows the TE to specify a minimum acceptable profile, which is checked by the MT
against the negotiated profile returned in the PDP context establishment and PDP context modification
procedures. Details can be found in 3GPP TS 23.107 and all of parameters save in NV automatically.
0 PDP context is not optimized for signaling
1 PDP context is optimized for signaling <PDP_type>
AT+CEGQMIN 3G Quality of Service Profile (Minimum Acceptable)
Test Command
AT+CGEQMIN=?
Response
+CGEQMIN: <PDP_type>,
(list of supported <Traffic class>s),
(list of supported <Maximum bitrate UL>s),
(list of supported <Maximum bitrate DL>s),
(list of supported <Guaranteed bitrate UL>s),
(list of supported <Guaranteed bitrate DL>s),
(list of supported <Delivery order>s),
(list of supported <Maximum SDU size>s),
(list of supported <SDU error ratio>s),
(list of supported <Residual bit error ratio>s),
(list of supported <Delivery of erroneous SDUs>s),
(list of supported <Transfer delay>s),
(list of supported <Traffic handling priority>s),
(list of supported <Source statistics descriptor>s),
(list of supported <Signalling indication>s)
OK
Read Command
AT+CGEQMIN?
Response
[+CGEQMIN: <cid>,
<Traffic class>,
<Maximum bitrate UL>,
<Maximum bitrate DL>,
<Guaranteed bitrate UL>,
<Guaranteed bitrate DL>,
<Delivery order>,
<Maximum SDU size>,
<SDU error ratio>,
<Residual bit error ratio>,
<Delivery of erroneous SDUs>,
<Transfer delay>,
<Traffic handling priority>,
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 162 / 230
Parameter
<Source statistics descriptor>,
<Signalling indication>]
[…]
OK
Write Command
AT+CGEQMIN=[<cid>[,<Traffic class>
[,<Maximum bitrate UL>
[,<Maximum bitrate DL>
[,<Guaranteed bitrate UL>
[,<Guaranteed bitrate DL>
[,<Delivery order>
[,<Maximum SDU size>
[,<SDU error ratio>
[,<Residual bit error ratio>
[,<Delivery of erroneous SDUs>
[,<Transfer delay>
[,<Traffic handling priority>
[,<Source statistics descriptor>
[,<Signalling indication>]]]]]]]]]]]]]]]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<cid> A numeric parameter which specifies a particular PDP context
definition (see +CGDCONT command)
<PDP_type> Packet data protocol type, a string parameter which specifies the type
of packet data protocol.
“IP” Internet Protocol (IPV4)
“PPP”
“IPV6”
“IPV4V6”
The following parameters are defined in 3GPP TS 23.107
<Traffic class> Integer type, indicates the type of application for which the UMTS
bearer service is optimized (refer to 3GPP TS 24.008 subclause
10.5.6.5). If the Traffic class is specified as conversational or
streaming, then the Guaranteed and Maximum bitrate parameters
should also be provided.
0 Conversational
1 Streaming
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 163 / 230
2 Interactive
3 Background
4 Subscribed value
<Maximum bitrate UL> Integer type, indicates the maximum number of kbits/s delivered to
UMTS (up-link traffic) at a SAP. As an example a bitrate of 32kbit/s
would be specified as „32‟ (e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~5760
<Maximum bitrate DL> Integer type, indicates the maximum number of kbits/s delivered by
UMTS (down-link traffic) at a SAP. As an example a bitrate of 32kbit/s
would be specified as „32‟ (e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~42200
<Guaranteed bitrate UL> Integer type, indicates the guaranteed number of kbits/s delivered to
UMTS (up-link traffic) at a SAP (provided that there is data to deliver).
As an example a bitrate of 32kbit/s would be specified as „32‟ (e.g.
AT+CGEQREQ=…,32, …).
0 Subscribed value
1~5760
<Guaranteed bitrate DL> Integer type, indicates the guaranteed number of kbits/s delivered by
UMTS (down-link traffic) at a SAP (provided that there is data to
deliver). As an example a bitrate of 32kbit/s would be specified as „32‟
(e.g. AT+CGEQREQ=…,32, …).
0 Subscribed value
1~42200
<Delivery order> Integer type, indicates whether the UMTS bearer shall provide
in-sequence SDU delivery or not (refer to 3GPP TS 24.008 subclause
10.5.6.5).
0 No
1 Yes
2 Subscribed value
<Maximum SDU size> Integer type, (1,2,3,…) indicates the maximum allowed SDU size in
octets. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 subclause 10.5.6.5).
0 Subscribed value
10...1520 (value needs to be divisible by 10 without remainder)
1502
<SDU error ratio> String type, indicates the target value for the fraction of SDUs lost or
detected as erroneous. SDU error ratio is defined only for conforming
traffic. The value is specified as „mEe‟. As an example a target SDU
error ratio of 5*10-3 would be specified as “5E3”
(e.g.AT+CGEQREQ=…,“5E3”,…).
“0E0” Subscribed value
“1E2”
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 164 / 230
“7E3”
“1E3”
“1E4”
“1E5”
“1E6”
“1E1”
<Residual bit error ratio> String type, indicates the target value for the undetected bit error ratio
in the delivered SDUs. If no error detection is requested, Residual bit
error ratio indicates the bit error ratio in the delivered SDUs. The value
is specified as “mEe”. As an example a target residual bit error ratio of
5•10-3 would be specified as “5E3” (e.g. AT+CGEQREQ=…,“5E3”,…).
“0E0” Subscribed value
“5E2”
“1E2”
“5E3”
“4E3”
“1E3”
“1E4”
“1E5”
“1E6”
“6E8”
<Delivery of erroneous SDUs> Integer type, indicates whether SDUs detected as erroneous shall be
delivered or not (refer to 3GPP TS 24.008 [8] subclause 10.5.6.5).
0 No
1 Yes
2 No detect
3 Subscribed value
<Transfer delay> Integer type, (0,1,2,…) indicates the targeted time between request to
transfer an SDU at one SAP to its delivery at the other SAP, in
milliseconds. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 subclause 10.5.6.5).
0 Subscribed value
100~150 (value needs to be divisible by 10 without remainder)
200~950 (value needs to be divisible by 50 without remainder)
1000~4000 (value needs to be divisible by 100 without remainder)
<Traffic handling priority> Integer type, (1,2,3,…) specifies the relative importance for handling of
all SDUs belonging to the UMTS bearer compared to the SDUs of
other bearers. If the parameter is set to „0‟ the subscribed value will be
requested (refer to 3GPP TS 24.008 [8] subclause 10.5.6.5).
0 Subscribed
1
2
3
<Source Statistics Descriptor> Integer type, specifies characteristics of the source of the submitted
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 165 / 230
10.7. AT+CGACT Activate or Deactivate PDP Context
The AT+CGACT write command is used to activate or deactivate the specified PDP context(s). After the
command has completed, the MT remains in V.250 command state. If any PDP context is already in the
requested state, the state for that context remains unchanged. If the MT is not PS attached when the
activation form of the command is executed, the MT first performs a PS attach and then attempts to
activate the specified contexts. If no <cid>s specify the activation/deactivation form of the command, it
will activate or deactivate all defined contexts.
SDUs for a PDP context.
0 Characteristics of SDUs is unknown
1 Characteristics of SDUs corresponds to a speech source
<Signalling Indication> Integer type, indicates signaling content of submitted SDUs for a PDP
context.
0 PDP context is not optimized for signaling
1 PDP context is optimized for signaling <PDP_type>
AT+CGACT Activate or Deactivate PDP Context
Test Command
AT+CGACT=?
Response
+CGACT: (list of supported <state>s)
OK
Read Command
AT+CGACT?
Response
+CGACT: <cid>,<state>
[<CR><LF>+CGACT: <cid><state>[…]]
OK
Write Command
AT+CGACT=<state>,<cid>
Response
OK
NO CARRIER
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
150s, determined by network.
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 166 / 230
Parameter
Example
AT+CGDCONT=1,”IP”,”UNINET” //Define PDP context
OK
AT+CGACT=1,1 //Activated PDP
OK
AT+CGACT=0,1 //Deactivated PDP
OK
10.8. AT+CGDATA Enter Data State
The AT+CGDATA write command causes the MT to perform whatever actions are necessary to establish
communication between the TE and the network using one or more packet domain PDP types. This may
include per-forming a PS attach and one or more PDP context activations. Commands following the
AT+CGDATA command in the AT command line will not be processed by the MT.
If the <L2P> parameter value is unacceptable to the MT, the MT shall return an ERROR or +CME ERROR
response. Otherwise, the MT issues the intermediate result code CONNECT and enters V.250 online data
state. After data transfer is complete, and the layer 2 protocol termination procedure has completed
successfully, the command state is reentered and the MT returns the final result code OK.
<state> Indicates the state of PDP context activation
0 Deactivated
1 Activated
Other values are reserved and will result in an ERROR response to the Write Command
<cid> A numeric parameter which specifies a particular PDP context definition (see +CGDCONT
command)
AT+CGDATA Enter Data State
Test Command
AT+CGDATA=?
Response
+CGDATA: (list of supported <L2P>s)
OK
Write Command
AT+CGDATA=<L2P>[,<cid>[,…]]
Response
CONNECT
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 167 / 230
Parameter
10.9. AT+CGPADDR Show PDP Address
The AT+CGPADDR write command returns a list of PDP addresses for the specified context identifiers. If
no <cid> is specified, the addresses for all defined contexts are returned.
Parameter
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<L2P> A string parameter that indicates the layer 2 protocol to be used between the TE and MT:
PPP Point to Point protocol for a PDP such as IP
Other values are not supported and will result in an ERROR response to the execution
command
<cid> A numeric parameter which specifies a particular PDP context definition (see +CGDCONT
command)
AT+CGPADDR Show PDP Address
Test Command
AT+CGPADDR=?
Response
+CGPADDR: (list of defined <cid>s)
OK
Write Command
AT+CGPADDR[=<cid>[,<cid>[,…]]]
Response
+CGPADDR: <cid>,<PDP_addr>
[+CGPADDR: <cid>,<PDP_addr>[…]]
OK
ERROR
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<cid> A numeric parameter which specifies a particular PDP context definition (see +CGDCONT
command)
<PDP_addr> A string that identifies the MT in the address space applicable to the PDP. The address may
be static or dynamic. For a static address, it will be the one set by the +CGDCONT
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 168 / 230
Example
AT+CGDCONT=1,”IP”,”UNINET” //Define PDP context
OK
AT+CGACT=1,1 //Activated PDP
OK
AT+CGPADDR=1 //Show PDP address
+CGPADDR: 1,“10.76.51.180”
OK
10.10. AT+CGCLASS GPRS Mobile Station Class
AT+CGCLASS is used to set the MT to operate according to the specified mode of operation, see 3GPP
TS 23.060.
command when the context was defined. For a dynamic address it will be the one assigned
during the last PDP context activation that used the context definition referred to <cid>.
<PDP_address> is omitted if none is available
AT+CGCLASS GPRS Mobile Station Class
Test Command
AT+CGCLASS=?
Response
+CGCLASS: (list of supported <class>s)
OK
Read Command
AT+CGCLASS?
Response
+CGCLASS: <class>
OK
Write Command
AT+CGCLASS=<class>
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 169 / 230
Parameter
10.11. AT+CGREG Network Registration Status
The AT+CGREG command queries the network registration status and controls the presentation of an
unsolicited result code +CGREG: <stat> when <n>=1 and there is a change in the MT‟s GPRS network
registration status in GERAN/UTRAN, or unsolicited result code +CGREG:
<stat>[,<lac>,<ci>[,<Act>],[<rac>]] when <n>=2 and there is a change of the network cell in
GERAN/UTRAN.
<class> A string parameter which indicates the GPRS mobile class (Functionality in
descending order)
“A” Class A
AT+CGREG Network Registration Status
Test Command
AT+CGREG=?
Response
+CGREG: (list of supported <n>s)
OK
Read Command
AT+CGREG?
Response
In Non-CDMA mode:
+CGREG: <n>,<stat>[,<lac>,<ci>[,<Act>]]
OK
In CDMA mode:
+CGREG: <n>,<stat>[,<sid>,<nid_bid>,<Act>]
OK
Write Command
AT+CGREG[=<n>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 170 / 230
Parameter
In Non-CDMA mode:
<n> 0 Disable network registration unsolicited result code
1 Enable network registration unsolicited result code +CGREG:<stat>
2 Enable network registration and location information unsolicited result code
+CGREG: <stat>[,<lac>,<ci>[,<Act>]]
<stat> 0 Not registered, MT is not currently searching an operator to register to .The UE is
in GMM state GMM-NULL or GMM-DEREGISTERED-INITIATED. The GPRS
service is disabled, the UE is allowed to attach for GPRS if requested by the user.
1 Registered, home network .The UE is in GMM state GMM-REGISTERED or
GMM-ROUTING-AREA-UPDATING-INITIATED INITIATED on the home PLMN.
2 Not registered, but MT is currently trying to attach or searching an operator to
register to. The UE is in GMM state GMM-DEREGISTERED or
GMM-REGISTERED-INITIATED. The GPRS service is enabled, but an allowable
PLMN is currently not available. The UE will start a GPRS attach as soon as an
allowable PLMN is available.
3 Registration denied. The UE is in GMM state GMM-NULL. The GPRS service is
disabled, the UE is not allowed to attach for GPRS if requested by the user.
4 Unknown
5 Registered, roaming
<lac> String type, two bytes location area code in hexadecimal format (e.g. “00C3” equals 195 in
decimal)
<ci> String type, two byte cell ID in hexadecimal format
<Act> Access technology selected
0 GSM
2 UTRAN
3 GSM W/EGPRS
4 UTRAN W/HSDPA
5 UTRAN W/HSUPA
6 UTRAN W/HSDPA and HSUPA
7 E-UTRAN
In CDMA mode:
<n> 0 Disable network registration unsolicited result code
1 Enable network registration unsolicited result code +CGREG:<stat>
2 Enable network registration and location information unsolicited result code
+CGREG: <n>,<stat>[,<sid>,<nid_bid>,<Act>]
<stat> 0 Not registered, MT is not currently searching an operator to register to .The UE is
in GMM state GMM-NULL or GMM-DEREGISTERED-INITIATED. The GPRS
service is disabled, the UE is allowed to attach for GPRS if requested by the user.
1 Registered, home network .The UE is in GMM state GMM-REGISTERED or
GMM-ROUTING-AREA-UPDATING-INITIATED INITIATED on the home PLMN.
<sid> String type, two bytes system ID in hexadecimal format
<nid_bid> String type, high 16 bit(network ID) and low 16bit(BTS ID) in hexadecimal format
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 171 / 230
Example
//NON-CDMA MODE
AT+CGREG=2
OK
AT+CGATT=0
OK
+CGREG: 2
AT+CGATT=1
OK
+CGREG: 1,“D504”,“80428B5”,2
//CDMA MODE
AT+CGREG=2
OK
AT+CGREG?
+CGREG: 2,1,”3747”,”A23C2”,100
OK
10.12. AT+CGEREP Packet Domain Event Reporting
Set command enables or disables sending of unsolicited result codes +CGEV: XXX from MT to TE in the
case of certain events occurring in the Packet Domain MT or the network. <mode> controls the
processing of unsolicited result codes specified within this command. <bfr> controls the effect on buffered
codes when <mode> 1 or 2 is entered.
<Act> Access technology selected
100 CDMA
AT+CGEREP Packet Domain Event Reporting
Test Command
AT+CGEREP=?
Response
+CGEREP: (list of supported <mode>s),(list of supported
<bfr>s)
OK
Read Command
AT+CGEREP?
Response
+CGEREP: <mode>,<bfr>
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 172 / 230
Parameter
The unsolicited result codes and the corresponding events are defined as follows:
1. +CGEV: REJECT <PDP_type>, <PDP_addr>: A network request for PDP context activation
occurred when the MT was unable to report it to the TE with a +CRING unsolicited result code and
was automatically rejected.
Note: This event is not applicable for EPS.
2. +CGEV: NW REACT <PDP_type>, <PDP_addr>, [<cid>]: The network has requested a context
reactivation. The <cid> used to reactivate the context is provided if known to the MT.
Note: This event is not applicable for EPS.
3. +CGEV: NW DEACT <PDP_type>, <PDP_addr>, [<cid>]: The network has forced a context
deactivation. The <cid> used to activate the context is provided if known to the MT.
4. +CGEV: ME DEACT <PDP_type>, <PDP_addr>, [<cid>]: The mobile equipment has forced a
context deactivation. The <cid> used to activate the context is provided if known to the MT.
5. +CGEV: NW DETACH: The network has forced a Packet Domain detach. This implies that all active
Write Command
AT+CGEREP=<mode>[,<bfr>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Execution Command
AT+CGEREP
Response
OK
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<mode> 0 Buffer unsolicited result codes in the MT; if MT result code buffer is full, the oldest
ones can be discarded. No codes are forwarded to the TE.
1 Discard unsolicited result codes when MT-TE link is reserved (e.g. in on-line data
mode); otherwise forward them directly to the TE.
2 Buffer unsolicited result codes in the MT when MT-TE link is reserved (e.g. in
on-line data mode) and flush them to the TE when MT-TE link becomes available;
otherwise forward them directly to the TE.
<bfr> 0 MT buffer of unsolicited result codes defined within this command is cleared when
<mode> 1 or 2 is entered.
1 MT buffer of unsolicited result codes defined within this command is flushed to the
TE when <mode> 1 or 2 is entered (OK response shall be given before flushing
the codes).
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 173 / 230
contexts have been deactivated. These are not reported separately.
6. +CGEV: ME DETACH: The mobile equipment has forced a Packet Domain detach. This implies that
all active contexts have been deactivated. These are not reported separately.
7. +CGEV: NW CLASS <class>: The network has forced a change of MS class. The highest available
class is reported (see AT+CGCLASS).
8. +CGEV: ME CLASS <class>: The mobile equipment has forced a change of MS class. The highest
available class is reported (see AT+CGCLASS).
9. +CGEV: PDN ACT <cid>: Activated a context. The context represents a PDN connection in LTE or a
Primary PDP context in GSM/UMTS.
10. +CGEV: PDN DEACT <cid>: Deactivated a context. The context represents a PDN connection in
LTE or a Primary PDP context in GSM/UMTS.
Example
AT+CGEREP=?
+CGEREP: (0-2),(0,1)
OK
AT+CGEREP?
+CGEREP: 0,0
OK
10.13. AT+CGSMS Select Service for MO SMS Messages
AT+CGSMS specifies the service or service preference that the MT will use to send MO (mobile
originated) SMS messages.
AT+CGSMS Select Service for MO SMS Messages
Test Command
AT+CGSMS=?
Response
+CGSMS: (list of currently available <service>s)
OK
Read Command
AT+CGSMS?
Response
+CGSMS: <service>
OK
Write Command
AT+CGSMS=[<service>]
Response
OK
If error is related to ME functionality:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 174 / 230
Parameter
The circuit switched service route is the default method.
10.14. AT+CEREG EPS Network Registration Status
The AT+CEREG command queries the network registration status and controls the presentation of an
unsolicited result code +CEREG: <stat> when <n>=1 and there is a change in the MT‟s EPS network
registration status in E-UTRAN, or unsolicited result code +CEREG: <stat>[,<tac>,<ci>[,<Act>]] when
<n>=2 and there is a change of the network cell in E-UTRAN.
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<service> A numeric parameter which indicates the service or service preference to be used
0 GPRS
1 Circuit switch
2 GPRS preferred (use circuit switched if GPRS not available)
3 Circuit switch preferred (use GPRS if circuit switched not available)
AT+CEREG EPS Network Registration Status
Test Command
AT+CEREG=?
Response
+CEREG: (list of supported <n>s)
OK
Read Command
AT+CEREG?
Response
+CEREG: <n>,<stat>[,<tac>,<ci>[,<Act>]]
OK
Write Command
AT+CEREG[=<n>]
Response
OK
ERROR
Maximum Response Time
300ms
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 175 / 230
Parameter
10.15. AT+QGDCNT GPRS Data Counter
This command allows the application to check how many bytes are sent or received for module.
Reference
3GPP TS 27.007
<n> 0 Disable network registration unsolicited result code
1 Enable network registration unsolicited result code +CEREG:<stat>
2 Enable network registration and location information unsolicited result code
+CEREG: <stat>[,<tac>,<ci>[,<Act>]]
<stat> 0 Not registered, MT is not currently searching an operator to register to
1 Registered, home network
2 Not registered, but MT is currently trying to attach or searching an operator to
register to
3 Registration denied
4 Unknown
5 Registered, roaming
<tac> String type, two bytes tracking area code in hexadecimal format
<ci> String type, two byte cell ID in hexadecimal format
<Act> Access technology selected
0 GSM
2 UTRAN
3 GSM W/EGPRS
4 UTRAN W/HSDPA
5 UTRAN W/HSUPA
6 UTRAN W/HSDPA and HSUPA
7 E-UTRAN
AT+QGDCNT GPRS Data Counter
Test Command
AT+QGDCNT=?
Response
+QGDCNT: (list of supported <op>s)
OK
Read Command
AT+QGDCNT?
Response
+QGDCNT: <bytes_sent>,<bytes_recv>
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 176 / 230
Parameter
<op>
A numeric parameter. The operation about data counter
0 Reset the data counter
1 Save the results of data counter to NV
If intend to auto save results please refer to command AT+QAUGDCNT.
<bytes_sent>
A numeric parameter. The amount of sent bytes.
<bytes_recv>
A numeric parameter. The amount of received bytes.
When module is powered on, <bytes_sent> and <bytes_recv> will be loaded from results of data
counter in NV. The default result in NV is 0.
Example
AT+QGDCNT=? //Test command
+QGDCNT: (0,1)
OK
AT+QGDCNT? //Query the current <bytes_sent> and <bytes_recv>
+QGDCNT: 3832,4618
OK
AT+QGDCNT=1 //Save the results to NV
OK
AT+QGDCNT =0 //Reset counter
OK
Write Command
AT+QGDCNT=<op>
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 177 / 230
10.16. AT+QAUGDCNT Auto Save GPRS Data Counter
This command allows command (AT+QGDCNT) saves results to NV automatically.
Parameter
The configuration would not be saved into NV.
Example
AT+QAUGDCNT=? //Test command
+QAUGDCNT: (0,30-65535)
OK
AT+QAUGDCNT=35 //Set <value>
AT+QAUGDCNT Auto Save GPRS Data Counter
Test Command
AT+QAUGDCNT=?
Response
+QAUGDCNT: (list of supported <value>s)
OK
Read Command
AT+QAUGDCNT?
Response
+QAUGDCNT: <value>
OK
Write Command
AT+QAUGDCNT=<value>
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
Quectel
<value>
A numeric parameter. Default value is 0. <value> is the time-interval for command
(AT+QGDCNT) saves results to NV automatically. If <value> is set to 0, auto-save
feature would be disabled. Unit is second.
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 178 / 230
OK
AT+QAUGDCNT? //Query the interval of auto-save
+QAUGDCNT: 35
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 179 / 230
11 Supplementary Service Commands
11.1. AT+CCFC Call Forwarding Number and Conditions Control
AT+CCFC allows control of the call forwarding supplementary service according to 3GPP TS 22.082.
Registration, erasure, activation, deactivation and status query are supported.
AT+CCFC Call Forwarding Number and Conditions Control
Test Command
AT+CCFC=?
Response
+CCFC: (list of supported <reads>s)
OK
Write Command
AT+CCFC=<reads>,<mode>[,<numbe
r>[,<type>[,<class>[,<subaddr>[,<sat
ype>[,time]]]]]]
Response
TA controls the call forwarding supplementary service.
Registration, erasure, activation, deactivation, and status
query are supported.
Only ,<reads> and <mode> should be entered with mode
(0-2,4)
If <mode><>2 and command successful:
OK
If <mode>=2 and command successful (only in connection
with <reads> 0 –3):
For registered call forwarding numbers:
+CCFC:
<status>,<class1>[,<number>,<type>[,<subaddr>,<satyp
e>[,<time>]]] [<CR><LF>+CCFC: ....]
OK
If no call forwarding numbers are registered (and therefore all
classes are inactive):
+CCFC: <status>,<class>
OK
where <status>=0 and <class>=15
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 180 / 230
Parameter
Example
AT+CCFC=0,3,“15021012496” //Register the destination number for unconditional call
forwarding (CFU)
OK
AT+CCFC=0,2 //Query the status of CFU without specifying <class>
+CCFC: 1,1,“+8615021012496”,145,,,
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<reads> 0 Unconditional
1 Mobile busy
2 No reply
3 Not reachable
4 All call forwarding (0-3)
5 All conditional call forwarding (1-3)
<mode> 0 Disable
1 Enable
2 Query status
3 Registration
4 Erasure
<number> Phone number in string type of forwarding address in format specified by <type>
<type> Type of address in integer format; default value is 145 when dialing string includes
international access code character “+”, otherwise 129
<subaddr> String type sub-address of format specified by <satype>
<satype> Type of sub-address in integer
<class> 1 Voice
2 Data
4 FAX
7 All telephony except SMS
8 Short message service
16 Data circuit sync
32 Data circuit async
<time> 1…30 When “no reply” (<reads>=no reply) is enabled or queried, this gives the time in
seconds to wait before call is forwarded, default value is 20
<status> 0 Not active
1 Active
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 181 / 230
OK
AT+CCFC=0,4 //Erase the registered CFU destination number
OK
AT+CCFC=0,2 //Query the status, no destination number
+CCFC: 0,255
OK
11.2. AT+CCWA Call Waiting Control
The AT+CCWA command allows control of the call waiting supplementary service according to 3GPP TS
22.083. Activation, deactivation and status query are supported.
AT+CCWA Call Waiting Control
Test Command
AT+CCWA=?
Response
+CCWA: (list of supported <n>s)
OK
Read Command
AT+CCWA?
Response
+CCWA: <n>
OK
Write Command
AT+CCWA[=<n>][,<mode>[,<class>]]
Response
TA controls the call waiting supplementary service. Activation,
deactivation and status query are supported.
If <mode><>2 and command successful:
OK
If <mode>=2 and command successful:
+CCWA:
<status>,<class1>[<CR><LF>+CCWA:<status>,<class2>[.
..]]
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 182 / 230
Parameter
1. <status>=0 should be returned only if service is not active for any <class> i.e. +CCWA: 0, 7 will be
returned in this case.
2. When <mode>=2, all active call waiting classes will be reported. In this mode the command is
aborted by pressing any key.
3. Unsolicited result code:
When the presentation call waiting at the TA is enabled (and call waiting is enabled) and a terminating
call set up during an established call, an unsolicited result code is returned:
+CCWA: <number>,<type>,<class>[,<alpha>]
Example
AT+CCWA=1,1 //Enable presentation of an unsolicited result code
OK
ATD10086; //Establish a call
OK
+CCWA: “02154450293”,129,1 //Indication of a call that has been waiting
<n> 0 Disable presentation of an unsolicited result code
1 Enable presentation of an unsolicited result code
<mode> When <mode> parameter is not given, network is not interrogated
0 Disable
1 Enable
2 Query status
<class> A sum of integers, each integer represents a class of information
1 Voice (telephony)
2 Data (bearer service)
4 FAX (facsimile)
16 Data circuit sync
32 Data circuit async
<status> 0 Disable
1 Enable
<number> Phone number in string type of calling address in format specified by <type>
<type> Type of address octet in integer format
129 Unknown type (IDSN format number)
145 International number type (ISDN format )
<alpha> Optional string type alphanumeric representation of <number> corresponding to the
entry found in phone book
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 183 / 230
11.3. AT+CHLD Call Related Supplementary Services
The AT+CHLD command allows the control of the following call related services:
- A call can be temporarily disconnected from the MT but the connection is retained by the network;
- Multiparty conversation (conference calls);
- The served subscriber who has two calls (one held and the other either active or alerting) can
connect the other parties and release the served subscriber‟s own connection.
Calls can be put on hold, recovered, released and added to a conversation, and transferred similarly as
defined in 3GPP TS 22.030.
This is based on the GSM/UMTS supplementary services HOLD (Call Hold; refer to 3GPP TS 22.083
clause 2), MPTY (MultiParty; refer to 3GPP TS 22.084) and ECT (Explicit Call Transfer; refer to 3GPP TS
22.091). The interaction of this command with other commands based on other GSM/UMTS
supplementary services is described in the GSM/UMTS standards. Call Hold, MultiParty and Explicit Call
Transfer are only applicable to teleservice 11.
Parameter
AT+CHLD Call Related Supplementary Services
Test Command
AT+CHLD=?
Response
+CHLD: (list of supported <n>s)
OK
Write Command
AT+CHLD[=<n>]
Response
TA controls the supplementary services call hold, multiparty
and explicit call transfer. Calls can be put on hold, recovered,
released, added to conversation and transferred.
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<n> 0 Terminate all held calls or UDUB (User Determined User Busy) for a waiting call. If
a call is waiting, terminate the waiting call. Otherwise, terminate all held calls (if
any)
1 Terminate all active calls (if any) and accept the other call (waiting call or held
call).
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 184 / 230
Example
ATD10086; //Establish a call
OK
+CCWA: “02154450293”,129,1 //Indication of a call that has been waiting
AT+CHLD=2 //Place the active call on hold and accept the waiting call as
the active call
OK
AT+CLCC
+CLCC: 1,0,1,0,0,“10086”,129 //The first call on hold
+CLCC: 2,1,0,0,0,“02154450293”,129 //The second call be active
OK
AT+CHLD=21 //Place the active call except call X=1 on hold
OK
AT+CLCC
+CLCC: 1,0,0,0,0,“10086”,129 //The first call be active
+CLCC: 2,1,1,0,1,“02154450293”,129 //The second call on hold
OK
AT+CHLD=3 //Add a held call to the active calls in order to set up a
conference (multiparty) call
OK
AT+CLCC
+CLCC: 1,0,0,0,1,“10086”,129
+CLCC: 2,1,0,0,1,“02154450293”,129
OK
1X Terminate the specific call number X (X=1-7)
2 Place all active calls on hold (if any) and accept the other call (waiting call or held
call) as the active call
2X Place all active calls except call X (X=1-7) on hold
3 Add the held call to the active calls
4 Connects the two calls and disconnects the subscriber from both calls (ECT)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 185 / 230
11.4. AT+CLIP Calling Line Identification Presentation
AT+CLIP refers to the GSM/UMTS supplementary service CLIP (Calling Line Identification Presentation)
that enables a called subscriber to get the calling line identity (CLI) of the calling party when receiving a
mobile terminated call.
Parameter
AT+CLIP Calling Line Identification Presentation
Test Command
AT+CLIP=?
Response
+CLIP: (list of supported <n>s)
OK
Read Command
AT+CLIP?
Response
+CLIP: <n>,<m>
OK
Write Command
AT+CLIP=<n>
Response
TA enables or disables the presentation of the calling line
identity (CLI) at the TE. It has no effect on the execution of the
supplementary service CLIP in the network.
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
15s, determined by network.
Reference
3GPP TS 27.007
<n> 0 Suppress unsolicited result codes
1 Display unsolicited result codes
<m> 0 CLIP not provisioned
1 CLIP provisioned
2 Unknown
<number> Phone number in string type of calling address in format specified by <type>
<subaddr> String type subaddress of format specified by <satype>
<satype> Type of subaddress octet in integer format (refer to 3GPP TS 24.008 [8] subclause
10.5.4.8)
<type> Type of address octet in integer format;
129 Unknown type (IDSN format)
145 International number type (ISDN format)
161 National number
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 186 / 230
Unsolicited result code:
When the presentation of the CLIP at the TE is enabled (and calling subscriber allows), an unsolicited
result code is returned after every RING (or +CRING: <type>) at a mobile terminating call:
+CLIP: <number>,<type>,[subaddr],[satype],[<alpha>],<CLI validity>
Example
AT+CPBW=1,“02151082965”,129,“QUECTEL”
OK
AT+CLIP=1
OK
RING
+CLIP: “02151082965”,129,,,“QUECTEL”,0
11.5. AT+CLIR Calling Line Identification Restriction
AT+CLIR refers to the CLIR supplementary service (Calling Line Identification Restriction) according to
3GPP TS 22.081 and the OIR supplementary service (Originating Identification Restriction) according to
3GPP TS 24.607) that allows a calling subscriber to enable or disable the presentation of the calling line
identity (CLI) to the called party when originating a call.
<alpha> String type alphanumeric representation of <number> corresponding to the entry
found in phone book
<CLI validity> 0 CLI valid
1 CLI has been withheld by the originator
2 CLI is not available due to interworking problems or limitations of originating
network
AT+CLIR Calling Line Identification Restriction
Test Command
AT+CLIR=?
Response
+CLIR: (list of supported <n>s)
OK
Read Command
AT+CLIR?
Response
+CLIR: <n>,<m>
OK
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 187 / 230
Parameter
11.6. AT+COLP Connected Line Identification Presentation
AT+COLP refers to the GSM/UMTS supplementary service COLP (Connected Line Identification
Presentation) that enables a calling subscriber to get the connected line identity (COL) of the called party
after setting up a mobile originated call. The command enables or disables the presentation of the COL at
the TE. It has no effect on the execution of the supplementary service COLR in the network.
Write Command
AT+CLIR[=<n>]
Response
TA restricts or enables the presentation of the calling line
identity (CLI) to the called party when originating a call.
The command overrides the CLIR subscription (default is
restricted or allowed) when temporary mode is provisioned as
a default adjustment for all following outgoing calls. This
adjustment can be revoked by using the opposite Command.
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
15s, determined by network.
Reference
3GPP TS 27.007
<n> Parameter sets the adjustment for outgoing calls
0 Presentation indicator is used according to the subscription of the CLIR service
1 CLIR invocation
2 CLIR suppression
<m> Parameter shows the subscriber CLIR service status in the network
0 CLIR not provisioned
1 CLIR provisioned in permanent mode
2 Unknown (e.g. no network, etc.)
3 CLIR temporary mode presentation restricted
4 CLIR temporary mode presentation allowed
AT+COLP Connected Line Identification Presentation
Test Command
AT+COLP=?
Response
+COLP: (list of supported <n>s)
OK
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 188 / 230
Parameter
Intermediate result code:
When enabled (and called subscriber allows), an intermediate result code is returned before any +CR or
V.25ter responses:
+COLP: <number>,<type>,[<subaddr>],[<satype>],[<alpha>]
Read Command
AT+COLP?
Response
+COLP: <n>,<m>
OK
Write Command
AT+COLP[=<n>]
Response
TA enables or disables the presentation of the COL
(Connected Line) at the TE for a mobile originating a call. It
has no effect on the execution of the supplementary service
COLR in the network.
Intermediate result code is returned from TA to TE before any
+CR or V.25ter responses.
OK
Maximum Response Time
15s, determined by network.
Reference
3GPP TS 27.007
<n> Parameter sets/shows the result code presentation status in the TA
0 Disable
1 Enable
<m> Parameter shows the subscriber COLP service status in the network
0 COLP not provisioned
1 COLP provisioned
2 Unknown (e.g. no network, etc.)
<number> Phone number in string type, format specified by <type>
<type> Type of address octet in integer format
129 Unknown type (IDSN format number)
145 International number type(ISDN format )
<subaddr> String type sub-address of format specified by <satype>
<satype> Type of sub-address octet in integer format (refer to 3GPP TS 24.008 sub clause
10.5.4.8 )
<alpha> Optional string type alphanumeric representation of <number> corresponding to the
entry found in phone book
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 189 / 230
Example
AT+CPBW=1,“02151082965”,129,“QUECTEL”
OK
AT+COLP=1
OK
ATD02151082965;
+COLP: “02151082965”,129,,,“QUECTEL”
OK
11.7. AT+CSSN Supplementary Service Notifications
AT+CSSN refers to supplementary service related network initiated notifications. The write command
enables/disables the presentation of notification result codes from TA to TE.
Parameter
AT+CSSN Supplementary Service Notifications
Test Command
AT+CSSN=?
Response
+CSSN: (list of supported <n>s),(list of supported <m>s)
OK
Read Command
AT+CSSN?
Response
+CSSN: <n>,<m>
OK
Write Command
AT+CSSN=<n>[,<m>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<n> Integer type, parameter sets/shows the +CSSI intermediate result code presentation
status to the TE
0 Disable
1 Enable
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 190 / 230
1. When <n>=1 and a supplementary service notification is received after a mobile originated call setup,
the +CSSI intermediate result code is sent to TE before any other MO call setup result codes:
+CSSI: <code1>
2. When <m>=1 and a supplementary service notification is received during a mobile terminated call
setup or during a call, the +CSSU unsolicited result code is sent to TE:
+CSSU: <code2>
11.8. AT+CUSD Unstructured Supplementary Service Data
AT+CUSD allows control of the Unstructured Supplementary Service Data (USSD) according to 3GPP TS
22.090. Both network and mobile initiated operations are supported.
Parameter <mode> is used to disable/enable the presentation of an unsolicited result code. The value
<mode>=2 is used to cancel an ongoing USSD session. For an USSD response from the network, or a
network initiated operation, the format is: +CUSD: <status>[,<rspstr>,[<dcs>]].
When <reqstr> is given, a mobile initiated USSD string or a response USSD string to a network initiated
operation is sent to the network. The response USSD string from the network is returned in a subsequent
+CUSD URC.
<m> Integer type (parameter sets/shows the +CSSU unsolicited result code presentation
status to the TE)
0 Disable
1 Enable
<code1> Integer type, it is manufacturer specific, which of these codes are supported
0 Unconditional call forwarding is active
1 Some of the conditional call forwardings are active
2 Call has been forwarded
3 Waiting call is pending
5 Outgoing call is barred
<code2> Integer type, it is manufacturer specific, which of these codes are supported
0 The incoming call is a forwarded call
2 Call has been put on hold (during a voice call)
3 Call has been retrieved (during a voice call)
5 Held call was terminated by other party
10 Additional incoming call forwarded
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 191 / 230
Parameter
AT+CUSD Unstructured Supplementary Service Data
Test Command
AT+CUSD=?
Response
+CUSD: (list of supported <mode>s)
OK
Read Command
AT+CUSD?
Response
+CUSD: <mode>
OK
Write Command
AT+CUSD[=<mode>[,<reqstr>[,<dcs>
]]]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
120s, determined by network.
Reference
3GPP TS 27.007
<mode> Integer type, sets/shows the result code presentation status to the TE
0 Disable the result code presentation to the TE
1 Enable the result code presentation to the TE
2 Cancel session(not applicable to read command response)
<reqstr> Unstructured Supplementary Service Data (USSD) to be sent to the network. If this
parameter is not given, network is not interrogated.
<rspstr> Unstructured Supplementary Service Data (USSD) received from the network
<dcs> Integer type, 3GPP TS 23.038 Cell Broadcast Data Coding Scheme (default 15)
<status> USSD response from the network or the network initiated operation
0 No further user action required (network initiated USSD Notify, or no further
information needed after mobile initiated operation)
1 Further user action required (network initiated USSD Request, or further
information needed after mobile initiated operation)
2 USSD terminated by network
3 Other local client has responded
4 Operation not supported
5 Network time out
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 192 / 230
12 Audio Commands
12.1. AT+CLVL Loud Speaker Volume Level
AT+CLVL is used to select the volume of the internal loudspeaker of the MT.
Parameter
12.2. AT+CMUT Mute Control
AT+CMUT is used to enable and disable the uplink voice muting during a voice call.
AT+CLVL Loud Speaker Volume Level
Test Command
AT+CLVL=?
Response
+CLVL: (list of supported <level>s)
OK
Read Command
AT+CLVL?
Response
+CLVL: <level>
OK
Write Command
AT+CLVL=<level>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<level> Integer type, value (0-3-5) with manufacturer specific range (Smallest value represents
the lowest sound level)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 193 / 230
Parameter
12.3. AT+VTS DTMF and Tone Generation
The AT+VTS command is used to send ASCII characters which causes MSC to transmit DTMF tones to a
remote subscriber. This command can only be operated in voice call.
AT+CMUT Mute Control
Test Command
AT+CMUT=?
Response
+CMUT: (list of supported <n>s)
OK
Read Command
AT+CMUT?
Response
+CMUT: <n>
OK
Write Command
AT+CMUT=<n>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<n> 0 Mute off
1 Mute on
AT+VTS DTMF and Tone Generation
Test Command
AT+VTS=?
Response
+VTS: (list of supported <dtmf_string>s),(list of supported
<duration>s)
OK
Write Command
AT+VTS=<dtmf_string>[,<duration>]
Response
OK
ERROR
If error is related to ME functionality:
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 194 / 230
Parameter
Example
ATD12345678900; //Dial
OK
<Call connect>
AT+VTS="1" //The remote can listen DTMF tone
OK
AT+VTS="1234567890A" //Send multiple tones at a time
OK
12.4. AT+VTD Tone Duration
AT+VTD sets the duration of DTMF tones. This command can also set the time interval between two
tones when sending multiple tones at a time.
+CME ERROR: <err>
Maximum Response Time
Depends on the length of <dtmf_string> and <duration>.
Reference
3GPP TS 27.007
<dtmf_string> ASCII characters in the set 0...9,#,*, A, B, C, D. The string should enclose in
quotation marks ("...")
When sending multiple tones at a time, the time interval of two tones
<interval> specified by +VTD. The maximal length of the string is 31
<duration> The duration of each tone in 1/10 seconds with tolerance. Value ranges from 0
to 255 and default is 0. If the duration is less than the minimum value depended
on the network, the actual duration is depended on the network. If this
parameter is omitted, <duration> is specified by +VTD.
AT+VTD Tone Duration
Test Command
AT+VTD=?
Response
+VTS: (0-255),(0-255)
OK
Read Command
AT+VTD?
Response
+VTD: <duration>,<interval>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 195 / 230
Parameter
12.5. AT+QAUDMOD Set Audio Mode
AT+QAUDMOD sets the audio mode required for the connected device. It will take effects at next sound
activity.
OK
Write Command
AT+VTD=<duration>[,<interval>]
Response
OK
ERROR
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<duration> The duration of each tone in 1/10 seconds with tolerance. Value ranges from
0 to 255 and the default is 3.
Whether the duration is less than the minimum value or not depends on the
network, and the actual duration depends on the network as well.
<interval> The time interval of two tones when sending multiple tones at a time by
+VTS. Value ranges from 0 to 255 and the default is 0.
AT+QAUDMOD Set Audio Mode
Test Command
AT+QAUDMOD=?
Response
+QAUDMOD: (list of supported <mode>s)
OK
Read command
AT+QAUDMOD?
Response
+QAUDMOD: <mode>
OK
Write Command
AT+QAUDMOD=<mode>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 196 / 230
Parameter
12.6. AT+QDAI Digital Audio Interface Configuration
AT+QDAI is used to configure the digital audio interface. While <io>=1, the user can define the PCM
mode (master/slave mode) by configuration setting; while <io>=3, the external codec chip linked with
PCM interface is ALC5616 model through the I2C. The settings will take effect after module reboot.
Maximum Response Time
300ms
Reference
Quectel
<mode> Numeric type, indicates the current configured audio mode
0 Echo canceller, noise suppressor, digital gain and calibration parameter for Handset
1 Echo canceller, noise suppressor, digital gain and calibration parameter for Headset
2 Echo canceller, noise suppressor, digital gain and calibration parameter for Speaker
AT+QDAI Digital Audio Interface Configuration
Test Command
AT+QDAI=?
Response
+QDAI: (list of supported <io>s),(list of supported <mode>s),
(list of supported <fsync>s),(list of supported <clock>s),(list
of supported <format>s)
OK
Read Command
AT+QDAI?
Response
+QDAI:
<io>[,<mode>,<fsync>,<clock>,<format><pcm16k>]
OK
Write Command
AT+QDAI=<io>[,<mode>,<fsync>,<clo
ck>[,<format>]]
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 197 / 230
Parameter
1. Configuration of <io> will be saved to NV immediately by default.
2. Now master & slave modes under short sync signal, and master mode under long sync signal are all
supported.
3. When you select short-sync & master mode, 256K-4096K clock frequency is supported. And if you
select long-sync & master mode, only 128K clock frequency is supported.
4. When you select slave mode, then you must provide master & sync clock for the module.
Example
AT+QDAI=? //Query the range.
+QDAI: (1-3),(0,1),(0,1),(0-5),(0-2),(0,1)
OK
AT+QDAI? //Query the current interface configuration.
+QDAI: 1,0,0,4,0
OK
AT+QDAI=1,1,0,4,1 //Set AUX PCM interface to slave short-sync mode, PCM format 8-bit a-law.
OK
<io> 1 Digital PCM output (customer defined)
2 Reserved
3 Analog output (for our default audio codec alc5616)
<mode> 0 Master mode
1 Slave mode
<fsync> 0 Primary mode (short-sync)
1 Auxiliary mode (long-sync)
<clock> 0 128K
1 256K
2 512K
3 1024K
4 2048K
5 4096K
<format> 0 16-bit linear
1 8-bit a-law
2 8-bit u-law
<pcm16k> 0 Disable
1 Enable
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 198 / 230
12.7. AT+QSIDET Set the Side Tone Gain in Current Mode
AT+QSIDET is used to set the side tone gain value of the current mode. It will take effects at next sound
activity.
Parameter
This parameter will not be saved.
12.8. AT+QAUDLOOP Enable Audio Loop Test
This command is used to enable audio loop test.
AT+QSIDET Set the Side Tone Gain in Current Mode
Test Command
AT+QSIDET=?
Response
+QSIDET: (list of supported <st_gain>s)
OK
Read Command
AT+QSIDET?
Response
+QSIDET: <st_gain>
OK
Write Command
AT+QSIDET=<st_gain>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
<st_gain> Numeric type; indicates the configured side tone gain in current mode
Range: 0-65535. Default value might be different in different audio modes
AT+QAUDLOOP Enable Audio Loop Test
Test Command
AT+QAUDLOOP=?
Response
+QAUDLOOP: (list of supported <enable>s)
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 199 / 230
Parameter
These parameters will not be saved.
12.9. AT+QMIC Set Up-link (MIC) Gains
This command is used to set MIC gains to change up-link volume.
OK
Read Command
AT+QAUDLOOP?
Response
+QAUDLOOP: <enable>
OK
Set Command
AT+QAUDLOOP=<enable>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
<enable> Numeric type; to enable or disable audio loop test
0 Disable audio loop test
1 Enable audio loop test
AT+QMIC Set Up-link (MIC) Gains
Test Command
AT+QMIC=?
Response
+QMIC: (0-65535),(0-65535)
OK
Read Command
AT+QMIC?
Response
+QMIC: <txgain>,<txdgain>
OK
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 200 / 230
Parameter
These parameters will not be saved.
12.10. AT+QTONEDET Enable/Disable DTMF Detection
This command is used to enable or disable DTMF detection. When you enable this function, DTMF tones
sent by other side will be detected, and report ASCII code on the serial port which you assigned.
Set Command
AT+QMIC=<txgain> [,<txdgain>]
Response
OK
ERROR
Maximum Response Time
300ms
<txgain> Numeric type, which indicates up-link codec gain and the range is 0-65535. The default
value might be different in different audio modes
<txdgain> Numeric type, which indicates up-link digital gain and the range is 0-65535. The default
value might be different in different audio modes
AT+ QTONEDET Enable/Disable DTMF Detection
Test Command
AT+QTONEDET=?
Response
+QTONEDET: (list of supported <enable>s)
OK
Read Command
AT+QTONEDET?
Response
+QTONEDET: <enable>
OK
Write Command
AT+QTONEDET=<enable>
Response
OK
ERROR
Maximum Response Time
300ms
Reference
Quectel
NOTE
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 201 / 230
Parameter
1. Settings will take effect immediately. When you reset the module, settings will revert to the default
values.
2. DTMF characters - ASCII:
DTMF
ASCII
DTMF
ASCII
0
48
8
56
1
49
9
57
2
50
A
65
3
51
B
66
4
52
C
67
5
53
D
68
6
54
*
42
7
55
#
35
12.11. AT+QRXGAIN Set Down-link (RX) Gains
This command is used to set RX gains to change down-link volume.
<enable> Enable/disable DTMF detection
0 Disable
1 Enable
AT+QRXAGIN Set Down-link (RX) Gains
Test Command
AT+QRXGAIN=?
Response
+QRXGAIN: (0-65535)
OK
Read Command
AT+QRXGAIN?
Response
+QRXGAIN: <rxgain>
OK
Write Command
AT+QRXGAIN=<rxgain>
Response
OK
ERROR
Maximum Response Time
300ms
NOTES
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 202 / 230
Parameter
Example
AT+QRXGAIN=? //Test Command.
+QRXGAIN: (0-65535)
OK
AT+QRXGAIN? //Query current value; the default value might be different in different
audio modes.
+QRXGAIN: 36864
OK
AT+QRXGAIN=8192 //Set codec gain to 8192.
OK
AT+QRXGAIN? //Query current configuration.
+QRXGAIN: 8192
OK
<rxgain> Numeric type, which indicates down-link codec gain. The range is 0-65535. The default
value might be different in different audio modes.
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 203 / 230
13 Hardware Related Commands
13.1. AT+QPOWD Power off
The command AT+QPOWD is used to shut down the module. The UE will return OK immediately when
the command is executed. Then the UE deactivates the network. After it is completed, the UE outputs
message “POWERED DOWN” and enter into the shutdown state. The maximum time for unregistering
network is 60 seconds. The UE is not allowed to turn off the power before the module STATE pin is set
low or the URC “POWERED DOWN” is output to avoid data loss.
13.2. AT+CCLK Clock
AT+CCLK sets and queries the real time clock (RTC) of the module. The current setting is retained until
the module is totally disconnected from power.
AT+QPOWD Power off
Execute Command
AT+QPOWD
Response
OK
Maximum Response Time
300ms
Reference
Quectel
AT+CCLK Clock
Test Command
AT+CCLK=?
Response
OK
Read Command
AT+CCLK?
Response
+CCLK: <time>
OK
Write Command
AT+CCLK=<time>
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 204 / 230
Parameter
Example
AT+CCLK? //Query the local time
+CCLK: “08/01/04,00:19:43+00”
OK
13.3. AT+CBC Battery Charge
AT+CBC returns battery connection status <bcs> and battery charge level <bcl> of the MT.
Maximum Response Time
300ms
Reference
3GPP TS 27.007
<time> String type value, format is “YY/MM/DD,hh:mm:ss±zz”, indicate year (two last digits),
month, day, hour, minutes, seconds and time zone (indicates the difference, expressed in
quarters of an hour, between the local time and GMT; range -48...+56). E.g. May 6th, 1994,
22:10:00 GMT+2 hours equals to “94/05/06,22:10:00+08”.
AT+CBC Battery Charge
Test Command
AT+CBC=?
Response
+CBC: (list of supported <bcs>s),(list of supported
<bcl>s),<voltage>
OK
Execution Command
AT+CBC
Response
+CBC: <bcs>,<bcl>,<voltage>
OK
If error is related to ME functionality:
+CME ERROR: <err>
Maximum Response Time
300ms
Reference
3GPP TS 27.007
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 205 / 230
Parameter
13.4. AT+QADC Read ADC
This command is used to read the voltage of the ADC channel.
Parameter
<bcs> Battery charge status
0 ME is not charging
1 ME is charging
2 Charging has finished
<bcl> Battery charging level
0-100 Battery has 0-100 percent of capacity remaining vent
<voltage> Battery voltage (Mv)
AT+QADC Read ADC
Test Command
AT+QADC=?
Response
+QADC: (list of supported <port>s)
OK
Read Command
AT+QADC=<port>
Response
+QADC: <status>,<value>
OK
Maximum Response Time
300ms
Reference
Quectel
<port> Channel number of the ADC.
0 ADC Channel 0
1 ADC Channel 1
<status> 0 Fail
1 Success
<value> The voltage of the ADC port (Mv)
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 206 / 230
13.5. AT+QSCLK Configure Whether or not to Enter into Sleep Mode
AT command “AT+QSCLK” is used to control whether the module enters into sleep mode. When
AT+QSCLK is enabled and DTR is pulled up, WAKEUP_IN is pulled up, the module can directly enter
sleep mode. If AT+QSCLK is enabled and DTR is pulled down, WAKEUP_IN is pulled down, you need
pull the DTR pin up and pull the WAKEUP_IN pin up, then module can enter into sleep mode.
Parameter
AT+QSCLK Configure Whether or not to Enter into Sleep Mode
Test Command
AT+QSCLK=?
Response
+QSCLK: (list of supported <n>s)
OK
Read Command
AT+QSCLK?
Response
+QSCLK: <n>
OK
Write Command
AT+QSCLK=<n>
Response
OK
Maximum Response Time
300ms
Reference
Quectel
<n> 0 Disable slow clock
1 Enable slow clock, it is controlled by DTR
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 207 / 230
14 Appendix
14.1. Reference
Table 6: Related Documents
Table 7: Terms and Abbreviations
SN
Document Name
Remark
[1]
V.25ter
Serial asynchronous automatic dialing and control
[2]
3GPP TS 27.007
Digital cellular telecommunications (Phase 2+);
Universal Mobile Telecommunications System (UMTS);
LTE; AT command set for User Equipment (UE)
[3]
3GPP TS 27.005
Digital cellular telecommunications (Phase 2+);
Universal Mobile Telecommunications System (UMTS);
LTE; Use of Data Terminal Equipment – Data Circuit
terminating Equipment (DTE-DCE) interface for Short
Message Service (SMS) and Cell Broadcast Service
(CBS)
Abbreviation
Description
AMR
Adaptive Multi-Rate
ME
Mobile Equipment
TA
Terminal Adapter
MS
Mobile Station
DCE
Data Communication Equipment
TE
Terminal Equipment
DTE
Data Terminal Equipment
RTS/CTS
Request To Send/Clear To Send
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 208 / 230
14.2. Factory Default Settings Restorable with AT&F
Table 8: Factory Default Settings Restorable with AT&F
GPRS
General Packet Radio Service
DCD
Dynamic Content Delivery
DTR
Data Terminal Ready
CSD
Circuit Switch Data
PSC
Primary Synchronization Code
PDP
Packet Data Protocol
TCP
Transmission Control Protocol
UDP
User Datagram Protocol
ECT
Explicit Call Transfer supplementary service
TA
Terminal Adapter
TE
Terminal Equipment
UE
User Equipment
AT Command
Parameters
Factory Defaults
ATE
<value>
1
ATQ
<n>
0
ATS0
<n>
0
ATS3
<n>
13
ATS4
<n>
10
ATS5
<n>
8
ATS6
<n>
2
ATS7
<n>
0
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 209 / 230
ATS8
<n>
2
ATS10
<n>
15
ATV
<value>
1
ATX
<value>
4
AT&C
<value>
1
AT&D
<value>
1
AT+ICF
<format>,<parity>
3,3
AT+CREG
<n>
0
AT+CGREG
<n>
0
AT+CBST
<speed>,<name>,<ce>
0,0,1
AT+CMEE
<n>
1
AT+CSCS
<chset>
“GSM”
AT+CSTA
<type>
129
AT+CR
<mode>
0
AT+CRC
<mode>
0
AT+CSMS
<service>
0
AT+CMGF
<mode>
0
AT+CSMP
<fo>,<vp>,<pid>,<dcs>
17,167,0,0
AT+CSDH
<show>
0
AT+CSCB
<mode>
0
AT+CPMS
<mem1>,<mem2>,<mem3>
“ME”,“ME”,“ME”
AT+CNMI
<mode>,<mt>,<bm>,<ds>,<bfr>
2,1,0,0,0
AT+CMMS
<n>
0
AT+CVHU
<mode>
0
AT+CLIP
<n>
0
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 210 / 230
14.3. AT Command Settings Storable with AT&W
Table 9: AT Command Settings Storable with AT&W
AT+COLP
<n>
0
AT+CLIR
<n>
0
AT+CSSN
<n>
0
AT+CTZR
<reporting>
0
AT+CPBS
<storage>
SM
AT+CGEREP
<mode>,<brf>
0,0
AT+CEREG
<n>
0
AT+CCWA
<n>
0
AT+CUSD
<mode>
0
AT+CLVL
<level>
3
AT+QAUDMOD
<mode>
0
AT+QAUDLOOP
<enable>
0
AT Command
Parameters
Display with AT&V
ATE
<value>
Yes
ATQ
<n>
Yes
ATS0
<n>
Yes
ATS7
<n>
Yes
ATS10
<n>
Yes
ATV
<value>
Yes
ATX
<value>
Yes
AT&C
<value>
Yes
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 211 / 230
14.4. AT Command Settings Storable with ATZ
Table 10: AT Command Settings Storable with ATZ
AT&D
<value>
Yes
AT+IPR
<rate>
No
AT+CREG
<n>
No
AT+CGREG
<n>
No
AT+CEREG
<n>
No
AT+QSIMDET
<enable>,<insert_level>
No
AT+QSIMSTAT
<enable>
No
AT Command
Parameters
Factory Defaults
ATE
<value>
1
ATQ
<n>
0
ATS0
<n>
0
ATS7
<n>
0
ATS10
<n>
15
ATV
<value>
1
ATX
<value>
4
AT&C
<value>
1
AT&D
<value>
1
AT+CREG
<n>
0
AT+CGREG
<n>
0
AT+CEREG
<n>
0
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 212 / 230
14.5. Summary of CME ERROR Codes
Final result code +CME ERROR: <err> indicates an error related to mobile equipment or network. The
operation is similar to ERROR result code. None of the following commands in the same command line is
executed. Neither ERROR nor OK result code shall be returned.
<err> values are mostly used by common message commands. The following table lists most of general
and GRPS related ERROR Codes. For some GSM protocol failure cause described in GSM specifications,
the corresponding ERROR codes are not included.
Table 11: Different Coding Schemes of +CME ERROR: <err>
Code of <err>
Meaning
0
Phone failure
1
No connection to phone
2
Phone-adaptor link reserved
3
Operation not allowed
4
Operation not supported
5
PH-SIM PIN required
6
PH-FSIM PIN required
7
PH-FSIM PUK required
10
SIM not inserted
11
SIM PIN required
12
SIM PUK required
13
SIM failure
14
SIM busy
15
SIM wrong
16
Incorrect password
17
SIM PIN2 required
18
SIM PUK2 required
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 213 / 230
14.6. Summary of CMS ERROR Codes
Final result code +CMS ERROR: <err> indicates an error related to mobile equipment or network. The
operation is similar to ERROR result code. None of the following commands in the same command line is
executed. Neither ERROR nor OK result code shall be returned.
<err> values are mostly used by common message commands:
20
Memory full
21
Invalid index
22
Not found
23
Memory failure
24
Text string too long
25
Invalid characters in text string
26
Dial string too long
27
Invalid characters in dial string
30
No network service
31
Network timeout
32
Network not allowed - emergency calls only
40
Network personalization PIN required
41
Network personalization PUK required
42
Network subset personalization PIN required
43
Network subset personalization PUK required
44
Service provider personalization PIN required
45
Service provider personalization PUK required
46
Corporate personalization PIN required
47
Corporate personalization PUK required
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 214 / 230
Table 12: Different Coding Schemes of +CMS ERROR: <err>
Code of <err>
Meaning
300
ME failure
301
SMS ME reserved
302
Operation not allowed
303
Operation not supported
304
Invalid PDU mode
305
Invalid text mode
310
SIM not inserted
311
SIM pin necessary
312
PH SIM pin necessary
313
SIM failure
314
SIM busy
315
SIM wrong
316
SIM PUK required
317
SIM PIN2 required
318
SIM PUK2 required
320
Memory failure
321
Invalid memory index
322
Memory full
330
SMSC address unknown
331
No network
332
Network timeout
500
Unknown
512
SIM not ready
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 215 / 230
14.7. Summary of URC
Table 13: Summary of URC
513
Message length exceeds
514
Invalid request parameters
515
ME storage failure
517
Invalid service mode
528
More message to send state error
529
MO SMS is not allow
530
GPRS is suspended
531
ME storage full
Index
URC Display
Meaning
Condition
1
+CREG: <stat>
Indicate registration status of the ME
AT+CREG=1
2
+CREG:
<stat>[,<lac>,<ci>[,<Act>]]
After cell neighborhood changing
shows whether the network has
currently indicated the registration of
the ME, with location area code
AT+CREG=2
3
+CGREG: <stat>
Indicate network registration status of
the ME
AT+CGREG=1
4
+CGREG:
<stat>[,<lac>,<ci>[,<Act>]]
Indicate network registration and
location information of the ME
AT+CGREG=2
5
+CTZV: <tz>
Time zone reporting
AT+CTZR=1
6
+CTZE: <tz>,<dst>,<time>
Extended time zone reporting
AT+CTZR=2
7
+CMTI: <mem>,<index>
New message is received, and saved
to memory
See AT+CNMI
8
+CMT:
[<alpha>],<length><CR><LF>
<pdu>
New short message is received and
output directly to TE (PDU mode)
See AT+CNMI
9
+CMT:
<oa>,[<alpha>],<scts>[,<tooa>
New short message is received and
output directly to TE (Text mode)
See AT+CNMI
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 216 / 230
,<fo>,<pid>,<dcs>,<sca>,<tosc
a>,<length>]<CR><LF><data>
10
^HCMT:
<oa>,<scts>,<lang>,
<fmt>,<length>,<prt>,<prv>,<ty
pe>,<stat><CR><LF><data>
New short message is received and
output directly to TE (CDMA Text
mode)
See AT+CNMI
11
+CBM:
<length><CR><LF><pdu>
New CBM is received and output
directly (PDU mode)
See AT+CNMI
12
+CBM:
<sn>,<mid>,<dcs>,<page>,<p
ages><CR><LF><data>
New CBM is received and output
directly to TE (Text mode)
See AT+CNMI
13
+CDS:
<length><CR><LF><pdu>
New CDS is received and output
directly (PDU mode)
See AT+CNMI
14
+CDS:
<fo>,<mr>,[<ra>],[<tora>],<sct
s>,<dt>,<st>
New CDS is received and output
directly to TE (Text mode)
See AT+CNMI
15
+CDSI: <mem>,<index>
New message status report is
received, and saved to memory
See AT+CNMI
16
^HCDS:
<oa>,<scts>,<lang>,
<fmt>,<length>,<prt>,<prv>,<ty
pe>,<stat><CR><LF><data>
New CDS is received and output
directly to TE (In CDMA Text mode)
See AT+CNMI
17
+COLP:
<number>,<type>,[<subaddr>],
[<satype>],[<alpha>]
The presentation of the COL
(connected line) at the TE for a
mobile originated call
AT+COLP=1
18
+CLIP:
<number>,<type>,[subaddr],[s
atype],[<alpha>],<CLI validity>
Mobile terminating call indication
AT+CLIP=1
19
+CRING: <type>
An incoming call is indicated to the
TE with unsolicited result code
instead of the normal RING
AT+CRC=1
20
+CCWA:
<number>,<type>,<class>[,<al
pha>]
Call waiting indication
AT+CCWA=1,1
21
+CSSI: <code1>
Shows the +CSSI intermediate result
code presentation status to the TE
AT+CSSN=1
22
+CSSU: <code2>
Shows the +CSSU unsolicited result
code presentation status to the TE
AT+CSSN=<n>,1
23
+CUSD:
<status>[,<rspstr>,[<dcs>]]
USSD response from the network, or
a network initiated operation
AT+CUSD=1
24
RDY
ME initialization is successful
N/A
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 217 / 230
14.8. SMS Character Sets Conversions
In 3GPP TS 23.038 DCS (Data Coding Scheme) defined three kinds of alphabets in SMS, GSM 7 bit
default alphabet, 8 bit data and UCS2(16bit). AT+CSMP can set the DCS in text mode (AT+CMGF=1). In
text mode, DCS (Data Coding Scheme) and AT+CSCS determine the way of SMS text input or output.
25
+CFUN: 1
All function of the ME is available
N/A
26
+CPIN: <state>
SIM card pin state
N/A
27
+QIND: SMS DONE
SMS initialization finished
N/A
28
+QIND: PB DONE
Phonebook initialization finished
N/A
29
POWERED DOWN
Module power down
AT+QPOWD
30
+CGEV: REJECT
<PDP_type>, <PDP_addr>
A network request for PDP activation,
and was automatically rejected.
AT+CGEREP=2,1
31
+CGEV: NW REACT
<PDP_type>, <PDP_addr>,
[<cid>]
The network request PDP
reactivation
AT+CGEREP=2,1
32
+CGEV: NW DEACT
<PDP_type>, <PDP_addr>,
[<cid>]
The network has forced a context
deactivation
AT+CGEREP=2,1
33
+CGEV: ME DEACT
<PDP_type>, <PDP_addr>,
[<cid>]
The ME has forced a context
deactivation.
AT+CGEREP=2,1
34
+CGEV: NW DETACH
The network has forced a Packet
Domain detach.
AT+CGEREP=2,1
35
+CGEV: ME DETACH
The mobile equipment has forced a
Packet Domain detach.
AT+CGEREP=2,1
36
+CGEV: NW CLASS <class>
The network has forced a change of
MS class.
AT+CGEREP=2,1
37
+CGEV: ME CLASS <class>
The mobile equipment has forced a
change of MS class.
AT+CGEREP=2,1
38
+CEREG: <stat>
Indicate network registration status of
the ME
AT+CEREG=1
39
+CEREG:
<stat>[,<tac>,<ci>[,<Act>]]
Indicate network registration and
location information of the ME
AT+CEREG=2
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 218 / 230
Table 14: The Way of SMS Text Input or Output
When DCS=GSM 7 bit, the input or output needs conversion. The detailed conversion tables are shown
as below.
Table 15: The Input Conversions Table (DCS=GSM 7 bit and AT+CSCS=“GSM”)
DCS
AT+CSCS
The Way of SMS Text Input or Output
GSM 7 bit
GSM
Input or output GSM character sets.
GSM 7 bit
IRA
Input or output IRA character sets.
Input: UE will convert IRA characters to GSM characters.
Output: UE will convert GSM characters to IRA characters.
GSM 7 bit
UCS2
Input or output a hex string similar to PDU mode. So only support
characters „0‟-„9‟ and „A‟-„F‟.
Input: UE will convert the UCS2 hex string to GSM characters.
Output: UE will convert the GSM characters to UCS2 hex string.
UCS2
-
Ignore the value of AT+CSCS, input or output a hex string similar to
PDU mode. So only support characters „0‟-„9‟ and „A‟-„F‟.
8 bit
-
Ignore the value of AT+CSCS, input or output a hex string similar to
PDU mode. So only support characters „0‟-„9‟ and „A‟-„F‟.
0
1
2
3
4
5
6
7
0
00
10
20
30
40
50
60
70
1
01
11
21
31
41
51
61
71
2
02
12
22
32
42
52
62
72
3
03
13
23
33
43
53
63
73
4
04
14
24
34
44
54
64
74
5
05
15
25
35
45
55
65
75
6
06
16
26
36
46
56
66
76
7
07
17
27
37
47
57
67
77
8
08
18
28
38
48
58
68
78
9
09
19
29
39
49
59
69
79
A
0A
Submit
2A
3A
4A
5A
6A
7A
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 219 / 230
Table 16: The Output Conversions Table (DCS=GSM 7 bit and AT+CSCS=“GSM”)
B
0B
Cancel
2B
3B
4B
5B
6B
7B
C
0C
1C
2C
3C
4C
5C
6C
7C
D
0D
1A
2D
3D
4D
5D
6D
7D
E
0E
1E
2E
3E
4E
5E
6E
7E
F
0F
1F
2F
3F
4F
5F
6F
7F
0
1
2
3
4
5
6
7
0
00
10
20
30
40
50
60
70
1
01
11
21
31
41
51
61
71
2
02
12
22
32
42
52
62
72
3
03
13
23
33
43
53
63
73
4
04
14
24
34
44
54
64
74
5
05
15
25
35
45
55
65
75
6
06
16
26
36
46
56
66
76
7
07
17
27
37
47
57
67
77
8
08
18
28
38
48
58
68
78
9
09
19
29
39
49
59
69
79
A
0D0A
2A
3A
4A
5A
6A
7A
B
0B
2B
3B
4B
5B
6B
7B
C
0C
1C
2C
3C
4C
5C
6C
7C
D
0D
1A
2D
3D
4D
5D
6D
7D
E
0E
1E
2E
3E
4E
5E
6E
7E
F
0F
1F
2F
3F
4F
5F
6F
7F
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 220 / 230
Table 17: GSM Extended Characters
Table 18: The Input Conversions Table (DCS=GSM 7 bit and AT+CSCS=“IRA”)
0
1
2
3
4
5
6
7
0
1B40
1
2
3
4
1B14
5
6
7
8
1B28
9
1B29
A
B
C
1B3C
D
1B3D
E
1B3E
F
1B2F
0
1
2
3
4
5
6
7
0
20
20
30
00
50
20
70
1
20
20
21
31
41
51
61
71
2
20
20
22
32
42
52
62
72
3
20
20
23
33
43
53
63
73
4
20
20
02
34
44
54
64
74
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 221 / 230
Table 19: IRA Extended Characters
5
20
20
25
35
45
55
65
75
6
20
20
26
36
46
56
66
76
7
20
20
27
37
47
57
67
77
8
backspace
20
28
38
48
58
68
78
9
20
20
29
39
49
59
69
79
A
0A
Submit
2A
3A
4A
5A
6A
7A
B
20
Cancel
2B
3B
4B
1B3C
6B
1B28
C
20
20
2C
3C
4C
1B2F
6C
1B40
D
0D
20
2D
3D
4D
1B3E
6D
1B29
E
20
20
2E
3E
4E
1B14
6E
1B3D
F
20
20
2F
3F
4F
11
6F
20
A
B
C
D
E
F
0
20
20
20
20
7F
20
1
40
20
20
5D
20
7D
2
20
20
20
20
20
08
3
01
20
20
20
20
20
4
24
20
5B
20
7B
20
5
03
20
0E
20
0F
20
6
20
20
1C
5C
1D
7C
7
5F
20
09
20
20
20
8
20
20
20
0B
04
0C
9
20
20
1F
20
05
06
A
20
20
20
20
20
20
B
20
20
20
20
20
20
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 222 / 230
Table 20: The Output Conversions Table (DCS=GSM 7 bit and AT+CSCS=“IRA”)
C
20
20
20
5E
07
7E
D
20
20
20
20
20
20
E
20
20
20
20
20
20
F
20
60
20
1E
20
20
0
1
2
3
4
5
6
7
0
40
20
20
30
A1
50
BF
70
1
A3
5F
21
31
41
51
61
71
2
24
20
22
32
42
52
62
72
3
A5
20
23
33
43
53
63
73
4
E8
20
A4
34
44
54
64
74
5
E9
20
25
35
45
55
65
75
6
F9
20
26
36
46
56
66
76
7
EC
20
27
37
47
57
67
77
8
F2
20
28
38
48
58
68
78
9
C7
20
29
39
49
59
69
79
A
0D0A
2A
3A
4A
5A
6A
7A
B
D8
2B
3B
4B
C4
6B
E4
C
F8
C6
2C
3C
4C
D6
6C
F6
D
0D
E6
2D
3D
4D
D1
6D
F1
E
C5
DF
2E
3E
4E
DC
6E
FC
F
E5
C9
2F
3F
4F
A7
6F
E0
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 223 / 230
Table 21: GSM Extended Characters
Because the low 8 bit of UCS2 character is same as the IRA character:
The conversion table of DCS=GSM 7 bit and AT+CSCS=“UCS2” is similar to AT+CSCS=“IRA”.
The conversion table of fmt=GSM 7 bit and AT+CSCS=“GSM” is similar to AT+CSCS=“GSM”.
The conversion table of fmt= GSM 7 bit and AT+CSCS=“IRA” is similar to AT+CSCS=“IRA”.
The conversion table of fmt=GSM 7 bit and AT+CSCS=“UCS2” is similar to AT+CSCS=“IRA”.
The difference is the way of SMS text input or output, please refer to Table 14.
0
1
2
3
4
5
6
7
0
7C
1
2
3
4
5E
5
6
7
8
7B
9
7D
A
B
C
5B
D
7E
E
5D
F
5C
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 224 / 230
14.9. Release Cause Text List of AT+CEER
Table 22: Release Cause Text List of AT+CEER
CS Internal Cause
No cause information available (default)
Phone is offline
No service available
Network release, no reason given
Received incoming call
Client ended call
UIM not present
Access attempt already in progress
Access failure, unknown source
Concur service not supported by network
No response received from network
GPS call ended for user call
SMS call ended for user call
Data call ended for emergency call
Rejected during redirect or handoff
Lower-layer ended call
Call origination request failed
Client rejected incoming call
Client rejected setup indication
Network ended call
No funds available
No service available
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 225 / 230
Full service not available
Maximum packet calls exceeded
Video connection lost
Video protocol closed after setup
Video protocol setup failure
Internal error
CS Network Cause
Unassigned/unalloacted number
No route to destination
Channel unacceptable
Operator determined barring
Normal call clearing
User busy
No user responding
User alerting, no answer
Call rejected
Number changed
Non selected user clearing
Destination out of order
Invalid/incomplete number
Facility rejected
Response to status enquiry
Normal, unspecified
No circuit/channel available
Network out of order
Temporary failure
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 226 / 230
Switching equipment congestion
Access information discarded
Requested circuit/channel not available
Resources unavailable, unspecified
Quality of service unavailable
Requested facility not subscribed
Incoming calls barred within the CUG
Bearer capability not authorized
Bearer capability not available
Service/option not available
Bearer service not implemented
ACM >= ACM max
Requested facility not implemented
Only RDI bearer is available
Service/option not implemented
Invalid transaction identifier value
User not member of CUG
Incompatible destination
Invalid transit network selection
Semantically incorrect message
Invalid mandatory information
Message non-existent/not implemented
Message type not compatible with state
IE non-existent/not implemented
Conditional IE error
Message not compatible with state
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 227 / 230
Recovery on timer expiry
Protocol error, unspecified
Interworking, unspecified
CS Network Reject
IMSI unknown in HLR
Illegal MS
IMSI unknown in VLR
IMEI not accepted
Illegal ME
GPRS services not allowed
GPRS and non GPRS services not allowed
MS identity cannot be derived
Implicitly detached
PLMN not allowed
Location area not allowed
Roaming not allowed
GPRS services not allowed in PLMN
No suitable cells in location area
MSC temporary not reachable
Network failure
MAC failure
Synch failure
Congestion
GSM authentication unacceptable
Service option not supported
Requested service option not subscribed
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 228 / 230
Service option temporary out of order
Call cannot be identified
No PDP context activated
Semantically incorrect message
Invalid mandatory information
Message type non-existent
Message type not compatible with state
Information element non-existent
Message not compatible with state
RR release indication
RR random access failure
RRC release indication
RRC close session indication
RRC open session failure
Low level failure
Low level failure no redial allowed
Invalid SIM
No service
Timer T3230 expired
No cell available
Wrong state
Access class blocked
Abort message received
Other cause
Timer T303 expired
No resources
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 229 / 230
Release pending
Invalid user data
PS Internal Cause
Invalid connection identifier
Invalid NSAPI
Invalid primary NSAPI
PDP establish timeout
Invalid field
SNDCP failure
RAB setup failure
No GPRS context
PDP activate timeout
PDP modify timeout
PDP inactive max timeout
PDP lower layer error
PDP duplicate
Access technology change
PDP unknown reason
CS PS Network Cause
LLC or SNDCP failure
Insufficient resources
Missing or unknown APN
Unknown PDP address or PDP type
User authentication failed
Activation rejected by GGSN
Activation rejected, unspecified
Quectel
Confidential
LTE Module Series
EC20 AT Commands Manual
EC20_AT_Commands_Manual Confidential / Released 230 / 230
Service option not supported
Requested service option not subscribed
Service option temporary out of order
NSAPI already used (not sent)
Regular deactivation
QoS not accepted
Network failure
Reactivation required
Feature not supported
Semantic error in the TFT operation
Syntactical error in the TFT operation
Unknown PDP context
PDP context without TFT already activated
Semantic errors in packet filter
Syntactical errors in packet filter
Invalid transaction identifier
Semantically incorrect message
Invalid mandatory information
Message non-existent/not implemented
Message type not compatible with state
IE non-existent/not implemented
Conditional IE error
Message not compatible with state
Protocol error, unspecified
Quectel
Confidential

Navigation menu