Quectel MC20 AT Commands Manual V1.0

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MC20
AT Commands Manual
GSM/GPRS/GNSS Module Series
Rev. MC20_AT_Commands_Manual_V1.0
Date: 2016-07-08

www.quectel.com

GSM/GPRS/GNSS Module Series
MC20 AT Commands Manual

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:

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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
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ARE RESERVED IN THE EVENT OF A PATENT GRANT OR REGISTRATION OF A UTILITY MODEL
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Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved.

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About the Document
History

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Revision

Date

Author

Description

1.0

2016-07-08

Hyman DING

Initial

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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 9
1

Introduction ........................................................................................................................................ 10
1.1.
Scope of the Document ......................................................................................................... 10
1.2.
AT Command Syntax............................................................................................................. 10
1.2.1.
Combining AT Commands on the Same Command Line ........................................... 11
1.2.2.
Entering Successive AT Commands on Separate Lines ............................................ 11
1.3.
Supported Character Sets ..................................................................................................... 11
1.4.
Flow Control .......................................................................................................................... 12
1.4.1.
Software Flow Control (XON/XOFF Flow Control) ..................................................... 12
1.4.2.
Hardware Flow Control (RTS/CTS Flow Control) ....................................................... 13
1.5.
Unsolicited Result Codes ...................................................................................................... 13

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2

General Commands ........................................................................................................................... 14
2.1.
ATI Display Product Identification Information.................................................................... 14
2.2.
AT+GMI Request Manufacturer Identification .................................................................... 15
2.3.
AT+GMM Request TA Model Identification ......................................................................... 15
2.4.
AT+GMR Request TA Revision Identification of Software Release ................................... 16
2.5.
AT+GOI Request Global Object Identification .................................................................... 16
2.6.
AT+CGMI Request Manufacturer Identification.................................................................. 17
2.7.
AT+CGMM Request Model Identification ........................................................................... 18
2.8.
AT+CGMR Request TA Revision Identification of Software Release ................................. 18
2.9.
AT+GSN Request International Mobile Equipment Identity (IMEI) .................................... 19
2.10.
AT+CGSN Request Product Serial Number Identification (Identical with +GSN) .............. 19
2.11.
AT+QGSN Request Product Serial Number Identification (IMEI) ...................................... 20
2.12.
AT&F Set All Current Parameters to Manufacturer Defaults .............................................. 21
2.13.
AT&V Display Current Configuration .................................................................................. 21
2.14.
AT&W Store Current Parameters to User Defined Profile .................................................. 23
2.15.
ATQ Set Result Code Presentation Mode .......................................................................... 24
2.16.
ATV TA Response Format .................................................................................................. 24
2.17.
ATX Set CONNECT Result Code Format and Monitor Call Progress ............................... 26
2.18.
ATZ Set All Current Parameters to User Defined Configurations ...................................... 27
2.19.
AT+CFUN Set Phone Functionality .................................................................................... 27
2.20.
AT+QPOWD Power off ....................................................................................................... 29
2.21.
AT+CMEE Report Mobile Equipment Error ........................................................................ 29
2.22.
AT+CSCS Select TE Character Set ................................................................................... 30
2.23.
AT+GCAP Request Complete TA Capabilities List............................................................. 31

3

Serial Interface Control Commands ................................................................................................ 33
3.1.
AT&C Set DCD Function Mode .......................................................................................... 33
3.2.
AT&D Set DTR Function Mode ........................................................................................... 33

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3.3.
3.4.
3.5.
3.6.

AT+ICF Set TE-TA Control Character Framing .................................................................. 34
AT+IFC Set TE-TA Local Data Flow Control....................................................................... 35
AT+ILRR Set TE-TA Local Data Rate Reporting Mode ...................................................... 36
AT+IPR Set TE-TA Fixed Local Rate .................................................................................. 37
3.6.1.
Adaptive Baud Rate .................................................................................................... 38
3.7.
AT+CMUX Multiplexer Control............................................................................................ 40
3.8.
AT+QEAUART Configure Dual UART Function ................................................................. 41
3.9.
AT+QSEDCB Configure Parameters of the Dual UART .................................................... 42

4

Status Control Commands ............................................................................................................... 44
4.1.
AT+CEER Extended Error Report ...................................................................................... 44
4.2.
AT+CPAS Mobile Equipment Activity Status ...................................................................... 45
4.3.
AT+QINDRI Indicate RI When Using URC ......................................................................... 46
4.4.
AT+QMOSTAT Show State of Mobile Originated Call ........................................................ 47
4.5.
AT+QREFUSECS Refuse to Receive SMS/Incoming Call or Not ..................................... 48
4.6.
AT+QIURC Enable or Disable Initial URC Presentation .................................................... 48
4.7.
AT+QEXTUNSOL Enable/Disable Proprietary Unsolicited Indications .............................. 49
4.8.
AT+QINISTAT Query State of Initialization ......................................................................... 51
4.9.
AT+QNSTATUS Query GSM Network Status..................................................................... 51
4.10.
AT+QNITZ Network Time Synchronization......................................................................... 52
4.11.
AT+QLTS Obtain Latest Network Time Synchronized ....................................................... 53
4.12.
AT+CTZU Network Time Synchronization and Update the RTC Time .............................. 54
4.13.
AT+CTZR Network Time Synchronization Report .............................................................. 55
4.14.
AT+QSIMDET Enable/Disable SIM Card Detection ........................................................... 55
4.15.
AT+QSIMSTAT SIM Inserted Status Reporting .................................................................. 56
4.16.
AT+QCGTIND Circuit Switched Call or GPRS PDP Context Termination Indication ........ 57

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5

SIM Related Commands .................................................................................................................... 59
5.1.
AT+CIMI Request International Mobile Subscriber Identity (IMSI) .................................... 59
5.2.
AT+CLCK Facility Lock ....................................................................................................... 60
5.3.
AT+CPIN Enter PIN ............................................................................................................ 62
5.4.
AT+CPWD Change Password ............................................................................................ 63
5.5.
AT+CRSM Restricted SIM Access...................................................................................... 65
5.6.
AT+CSIM Generic SIM Access ........................................................................................... 66
5.7.
AT+QCSPWD Change PS Super Password ...................................................................... 66
5.8.
AT+CCID Show CCID ......................................................................................................... 67
5.9.
AT+QCCID Show CCID ...................................................................................................... 68
5.10.
AT+QGID Get SIM Card Group Identifier ........................................................................... 68
5.11.
AT+QSIMVOL Select SIM Card Operating Voltage............................................................ 69
5.12.
AT+QSPN Get Service Provider Name from SIM .............................................................. 70
5.13.
AT+QTRPIN Times Remain to Input SIM PIN/PUK ........................................................... 70

6

Network Service Commands ............................................................................................................ 72
6.1.
AT+COPS Operator Selection ............................................................................................ 72
6.2.
AT+CREG Network Registration ........................................................................................ 74
6.3.
AT+CSQ Signal Quality Report .......................................................................................... 75

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6.4.
6.5.
6.6.
6.7.
6.8.
6.9.
7

8

AT+CPOL Preferred Operator List...................................................................................... 76
AT+COPN Read Operator Names...................................................................................... 77
AT+QBAND Get and Set Mobile Operation Band .............................................................. 78
AT+QENG Switch on or off Engineering Mode .................................................................. 79
AT+QSCANF Scan Power of GSM Frequency .................................................................. 82
AT+QLOCKF Lock GSM Frequency .................................................................................. 83

Call Related Commands .................................................................................................................... 84
7.1.
ATA Answer an Incoming Call............................................................................................. 84
7.2.
ATD Mobile Originated Call to Dial a Number .................................................................... 85
7.3.
ATH Disconnect Existing Connection ................................................................................. 86
7.4.
+++ Switch from Data Mode to Command Mode ............................................................... 87
7.5.
ATO Switch from Command Mode to Data Mode .............................................................. 88
7.6.
ATP Select Pulse Dialing .................................................................................................... 88
ATS0 Set Number of Rings before Automatically Answering Call...................................... 89
7.7.
7.8.
ATS6 Set Pause before Blind Dialing ................................................................................. 89
7.9.
ATS7 Set Number of Seconds to Wait for Connection Completion ................................... 90
7.10.
ATS8 Set the Number of Seconds to Wait for Comma Dial Modifier ................................. 91
7.11.
ATS10 Set Disconnect Delay after Indicating the Absence of Data Carrier ....................... 91
7.12.
ATT Select Tone Dialing...................................................................................................... 92
7.13.
AT+CSTA Select Type of Address ...................................................................................... 92
7.14.
AT+CLCC List Current Calls of ME .................................................................................... 93
7.15.
AT+CR Service Reporting Control ...................................................................................... 94
7.16.
AT+CRC Set Cellular Result Code for Incoming Call Indication ........................................ 95
7.17.
AT+CRLP Select Radio Link Protocol Parameter .............................................................. 97
7.18.
AT+CSNS Single Numbering Scheme ............................................................................... 98
7.19.
AT+CMOD Configure Alternating Mode Calls .................................................................... 98
7.20.
AT+QSFR Preference Speech Coding ............................................................................... 99
7.21.
AT+QSPCH Speech Channel Type Report ...................................................................... 100
7.22.
AT+QDISH Disable ATH ................................................................................................... 101

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SMS Commands ............................................................................................................................... 102
8.1.
AT+CSMS Select Message Service ................................................................................. 102
8.2.
AT+CMGF Select SMS Message Format......................................................................... 103
8.3.
AT+CSCA SMS Service Center Address.......................................................................... 103
8.4.
AT+CPMS Preferred SMS Message Storage ................................................................... 105
8.5.
AT+CMGD Delete SMS Message .................................................................................... 106
8.6.
AT+CMGL List SMS Messages from Preferred Storage .................................................. 107
8.7.
AT+CMGR Read SMS Message ...................................................................................... 110
8.8.
AT+CMGS Send SMS Message....................................................................................... 113
8.9.
AT+CMGW Write SMS Message to Memory ................................................................... 115
8.10.
AT+CMSS Send SMS Message from Storage ................................................................. 116
8.11.
AT+CMGC Send SMS Command .................................................................................... 117
8.12.
AT+CNMI New SMS Message Indications ....................................................................... 119
8.13.
AT+CRES Restore SMS Settings ..................................................................................... 121

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8.14.
8.15.
8.16.
8.17.
8.18.
8.19.
8.20.
9

AT+CSAS Save SMS Settings ......................................................................................... 122
AT+CSCB Select Cell Broadcast SMS Messages ........................................................... 122
AT+CSDH Show SMS Text Mode Parameters ................................................................. 123
AT+CSMP Set SMS Text Mode Parameters .................................................................... 125
AT+QCLASS0 Store Class 0 SMS to SIM when Receiving Class 0 SMS ....................... 126
AT+QMGDA Delete All SMS ............................................................................................. 127
AT+QSMSCODE Configure SMS Code Mode ................................................................. 128

Phonebook Commands ................................................................................................................... 129
9.1.
AT+CPBS Select Phonebook Memory Storage ............................................................... 129
9.2.
AT+CPBW Write Phonebook Entry .................................................................................. 130
9.3.
AT+CPBR Read Current Phonebook Entries ................................................................... 131
9.4.
AT+CPBF Find Phonebook Entries .................................................................................. 132
9.5.
AT+CNUM Subscriber Number ........................................................................................ 133

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10 GPRS Commands ............................................................................................................................ 135
10.1.
AT+CGATT Attach to/Detach from GPRS Service ........................................................... 135
10.2.
AT+CGDCONT Define PDP Context ................................................................................ 136
10.3.
AT+CGQREQ Quality of Service Profile (Requested)...................................................... 137
10.4.
AT+CGQMIN Quality of Service Profile (Minimum Acceptable) ....................................... 138
10.5.
AT+CGACT PDP Context Activate or Deactivate ............................................................. 139
10.6.
AT+CGDATA Enter Data State.......................................................................................... 140
10.7.
AT+CGPADDR Show PDP Address ................................................................................. 141
10.8.
AT+CGCLASS GPRS Mobile Station Class ..................................................................... 142
10.9.
AT+CGEREP Control Unsolicited GPRS Event Reporting .............................................. 143
10.10. AT+CGREG Network Registration Status ........................................................................ 144
10.11. AT+CGSMS Select Service for MO SMS Messages ....................................................... 145
10.12. AT+QGPCLASS Change GPRS Multi-slot Class ............................................................. 146

11 TCPIP Commands ............................................................................................................................ 147
11.1.
AT+QIOPEN Start up TCP or UDP Connection ............................................................... 147
11.2.
AT+QISEND Send Data through TCP or UDP Connection .............................................. 148
11.3.
AT+QICLOSE Close TCP or UDP Connection ................................................................. 149
11.4.
AT+QIDEACT Deactivate GPRS/CSD PDP Context ....................................................... 150
11.5.
AT+QILPORT Set Local Port ............................................................................................ 151
11.6.
AT+QIREGAPP Start TCPIP Task and Set APN, User Name and Password .................. 152
11.7.
AT+QIACT Activate GPRS/CSD Context ......................................................................... 153
11.8.
AT+QILOCIP Get Local IP Address .................................................................................. 153
11.9.
AT+QISTAT Query Current Connection Status ................................................................ 154
11.10. AT+QISTATE Query Connection Status of the Current Access ....................................... 155
11.11. AT+QISSTAT Query the Current Server Status ................................................................ 157
11.12. AT+QIDNSCFG Configure Domain Name Server ............................................................ 158
11.13. AT+QIDNSGIP Query the IP Address of Given Domain Name ....................................... 159
11.14. AT+QIDNSIP Connect with IP Address or Domain Name Server .................................... 159
11.15. AT+QIHEAD Add an IP Header When Receiving Data.................................................... 160
11.16. AT+QIAUTOS Set Auto Sending Timer ............................................................................ 161

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11.17.
11.18.
11.19.
11.20.
11.21.
11.22.
11.23.
11.24.
11.25.
11.26.
11.27.
11.28.
11.29.
11.30.
11.31.
11.32.
11.33.
11.34.

AT+QIPROMPT Set Prompt of „>‟ When Sending Data ................................................... 162
AT+QISERVER Configured as Server.............................................................................. 162
AT+QICSGP Select CSD or GPRS as the Bearer ........................................................... 164
AT+QISRVC Choose Connection ..................................................................................... 165
AT+QISHOWRA Set Whether or Not to Display the Address of Sender ....................... 166
AT+QISCON Save TCPIP Application Context ................................................................ 166
AT+QIMODE Select TCPIP Transfer Mode ...................................................................... 168
AT+QITCFG Configure Transparent Transfer Mode ........................................................ 169
AT+QISHOWPT Control Whether or Not to Show the Protocol Type .............................. 170
AT+QIMUX Control Whether or Not to Enable Multiple TCPIP Sessions ........................ 170
AT+QISHOWLA Control Whether or Not to Display Local IP Address ............................ 171
AT+QIFGCNT Select a Context as Foreground Context ................................................. 172
AT+QISACK Query the Data Information for Sending ..................................................... 173
AT+QINDI Set the Method to Handle Received TCP/IP Data .......................................... 174
AT+QIRD Retrieve the Received TCP/IP Data ................................................................ 175
AT+QISDE Control Whether or Not to Echo the Data for QISEND ................................. 176
AT+QPING Ping a Remote Server ................................................................................... 177
AT+QNTP Synchronize the Local Time via NTP .............................................................. 178

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12 Supplementary Service Commands .............................................................................................. 180
12.1.
AT+CCFC Call Forwarding Number and Conditions Control ........................................... 180
12.2.
AT+CCUG Closed User Group Control ............................................................................ 182
12.3.
AT+CCWA Call Waiting Control ........................................................................................ 183
12.4.
AT+CHLD Call Hold and Multiparty .................................................................................. 184
12.5.
AT+CLIP Calling Line Identification Presentation ............................................................. 186
12.6.
AT+QCLIP Control Whether or Not to Show the Name of Incoming Call Number .......... 188
12.7.
AT+CLIR Calling Line Identification Restriction ................................................................ 189
12.8.
AT+COLP Connected Line Identification Presentation .................................................... 190
12.9.
AT+QCOLP Show Alpha Field in +COLP String ............................................................... 191
12.10. AT+CUSD Unstructured Supplementary Service Data .................................................... 192
12.11. AT+CSSN Supplementary Services Notification .............................................................. 193

13 Audio Commands ............................................................................................................................ 195
13.1.
ATL Set Monitor Speaker Loudness ................................................................................. 195
13.2.
ATM Set Monitor Speaker Mode....................................................................................... 195
13.3.
AT+VTD Tone Duration ..................................................................................................... 196
13.4.
AT+VTS DTMF and Tone Generation............................................................................... 197
13.5.
AT+CALM Alert Sound Mode ........................................................................................... 198
13.6.
AT+CRSL Ringer Sound Level ......................................................................................... 198
13.7.
AT+CLVL Loud Speaker Volume Level............................................................................. 199
13.8.
AT+CMUT Mute Control ................................................................................................... 200
13.9.
AT+QSIDET Change the Side Tone Gain Level ............................................................... 200
13.10. AT+QMIC Change the Microphone Gain Level ................................................................ 201
13.11. AT+QLDTMF Generate Local DTMF Tones ..................................................................... 202
13.12. AT+QAUDCH Swap the Audio Channels ......................................................................... 203

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13.13.
13.14.
13.15.
13.16.
13.17.
13.18.

AT+QAUDLOOP Audio Channel Loop Back Test ............................................................ 204
AT+QLTONE Generate Local Specific Tone ..................................................................... 204
AT+QTONEP Set DTMF Output Path .............................................................................. 205
AT+QTDMOD Set Tone Detection Mode .......................................................................... 206
AT+QTONEDET Detect DTMF ......................................................................................... 207
AT+QWDTMF Play DTMF Tone During the Call .............................................................. 209

14 Hardware Related Commands ........................................................................................................ 212
14.1.
AT+CCLK Clock ................................................................................................................ 212
14.2.
AT+QALARM Set Alarm.................................................................................................... 213
14.3.
AT+CBC Battery Charge................................................................................................... 214
14.4.
AT+QADC Read ADC ....................................................................................................... 214
14.5.
AT+QSCLK Configure Slow Clock.................................................................................... 215
14.6.
AT+QLEDMODE Configure the Network Indication LED Patterns .................................. 216
14.7.
AT+QVBATT Configure the Threshold of Voltage ............................................................ 217

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15 Others Commands ........................................................................................................................... 220
15.1.
A/ Re-issue the Last Command Given ............................................................................. 220
15.2.
ATE Set Command Echo Mode ........................................................................................ 220
15.3.
ATS3 Set Command Line Termination Character ............................................................ 221
15.4.
ATS4 Set Response Formatting Character ...................................................................... 221
15.5.
ATS5 Set Command Line Editing Character .................................................................... 222
15.6.
AT+QRIMODE Set RI Time .............................................................................................. 222
15.7.
AT+QCFG="RFTXburst" Burst Transition Signal Indication ............................................. 223

16 Appendixes ....................................................................................................................................... 225
16.1.
Related Documents ............................................................................................................. 225
16.2.
Terms and Abbreviations ..................................................................................................... 226
16.3.
Factory Default Settings Restorable with AT&F .................................................................. 226
16.4.
AT Command Settings Storable with AT&W........................................................................ 229
16.5.
AT Command Settings Storable with ATZ ........................................................................... 231
16.6.
Summary of URC ................................................................................................................ 233
16.7.
Summary of CME ERROR Codes ...................................................................................... 235
16.8.
Summary of CMS ERROR Codes ...................................................................................... 239
16.9.
Summary of Cause for Extended Error Report ................................................................... 241
16.9.1.
Location ID for the Extended Error Report ............................................................... 241
16.9.2.
Cause for Protocol Stack (PS) Layer ........................................................................ 242
16.9.3.
Internal Cause for MM Layer..................................................................................... 254
16.9.4.
Cause for PPP/IP-Stack ............................................................................................ 255

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Table Index
TABLE 1: TYPES OF AT COMMANDS AND RESPONSES ......................................................................11
TABLE 2: CURRENT CONFIGURATION LIST WHEN EXECUTING AT&V COMMAND ......................... 22
TABLE 3: ATV0&ATV1 RESULT CODES NUMERIC EQUIVALENTS AND BRIEF DESCRIPTIONS...... 25
TABLE 4: RELATED DOCUMENTS ........................................................................................................ 225
TABLE 5: TERMS AND ABBREVIATIONS .............................................................................................. 226
TABLE 6: FACTORY DEFAULT SETTINGS RESTORABLE WITH AT&F .............................................. 226
TABLE 7: AT COMMAND SETTINGS STORABLE WITH AT&W ............................................................ 229
TABLE 8: AT COMMAND SETTINGS STORABLE WITH ATZ ................................................................ 231
TABLE 9: SUMMARY OF URC ................................................................................................................ 233
TABLE 10: DIFFERENT CODING SCHEMES OF +CME ERROR:  ........................................... 236
TABLE 11: DIFFERENT CODING SCHEMES OF +CMS ERROR:  ........................................... 239
TABLE 12: LOCATION ID FOR THE EXTENDED ERROR REPORT .................................................... 241
TABLE 13: CAUSE FOR PROTOCOL STACK (PS) LAYER ................................................................... 242
TABLE 14: INTERNAL CAUSE FOR MM LAYER ................................................................................... 254
TABLE 15: CAUSE FOR PPP/IP-STACK ................................................................................................ 255

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1

Introduction

1.1. Scope of the Document

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This document presents the AT Commands Set for Quectel cellular engine MC20.

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
.
Commands
are
usually
followed
by
a
response
that
includes
“”. Throughout this document, only the responses are presented,
“” are omitted intentionally.

The AT Commands Set implemented by MC20 is a combination of GSM07.05, GSM07.07 and ITU-T
recommendation V.25ter as well as 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”, or “AT&”, where “” is the command, and
“” is/are the argument(s) for that command. An example of this is “ATE”, which tells the DCE
whether received characters should be echoed back to the DTE according to the value of “”. “” is
optional and a default will be used if it is missing.
 S parameter syntax
These AT commands have the format of “ATS=”, where “” is the index of the S register to set,
and “” is the value to assign to it. “” is optional; if it is missing, then a default value is assigned.
 Extended syntax
These commands can be operated in several modes, as following table:

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Table 1: Types of AT Commands and Responses

Test Command

AT+=?

This command returns the list of parameters and value ranges
set by the corresponding Write Command or internal
processes.

Read Command

AT+?

This command returns the currently set value of the parameter
or parameters.

Write Command

AT+=<…>

This command sets the user-definable parameter values.

Execution
Command

AT+

This command reads non-variable parameters affected by
internal processes in the GSM engine.

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1.2.1. Combining AT Commands on the Same Command Line

You can enter several AT commands on the same line. In this case, you do not need to type the “AT” or
“at” prefix before every command. Instead, you only need to type “AT” or “at” at the beginning of the
command line. Please note that use a semicolon as command delimiter.
The command line buffer can accept a maximum of 256 characters. If the input characters exceeded the
maximum then no command will be executed and TA will return “ERROR”.

1.2.2. Entering Successive AT Commands on Separate Lines

When you need to enter a series of AT commands on separate lines, please note that you need to wait the
final response (for example OK, CME error, CMS error) of the last AT command you entered before you
enter the next AT command.

1.3. Supported Character Sets

The MC20 AT command interface defaults to the GSM character set. The MC20 supports the following
character sets:







GSM
UCS2
HEX
IRA
PCCP437
8859-1

The character set can be configured and interrogated using the “AT+CSCS” command (GSM 07.07). The
character set is defined in GSM specification 07.05. The character set affects transmission and reception

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of SMS and SMS Cell Broadcast Messages, as well as the entry and display of phone book entries text
field and SIM Application Toolkit alpha strings.

1.4. Flow Control
Flow control is very important for correct communication between the GSM engine and the DTE. In cases
such as a data or fax call, the sending device is transferring data faster than the receiving side ready to
accept. When the receiving buffer reaches its capacity, the receiving device should be able to cause the
sending device to pause until it catches up.

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There are basically two approaches to achieve data flow control: software flow control and hardware flow
control. MC20 supports both two kinds of flow control.
In multiplex mode, it is recommended to use the hardware flow control.
The default flow control approach of MC20 is disabled.

1.4.1. Software Flow Control (XON/XOFF Flow Control)

Software flow control sends different characters to stop (XOFF, decimal 19) and resume (XON, decimal
17) data flow. It is quite useful in some applications that only use three wires on the serial interface.

The default flow control approach of MC20 is disabled. To enable software flow control in the DTE
interface and within GSM engine, type the following AT command:
AT+IFC=1, 1

This setting is stored in volatile memory, for use after restart. AT+IFC=1, 1 should be stored to the
user profile with AT&W.
Ensure that all communication software packages (e.g. ProComm Plus, Hyper Terminal or WinFax Pro)
use software flow control.

NOTE

Software Flow Control should not be used for data calls where binary data will be transmitted or received
(e.g. TCP/IP), because the DTE interface may interpret binary data as flow control characters.

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1.4.2. Hardware Flow Control (RTS/CTS Flow Control)
The default flow control approach of MC20 is disabled. To enable hardware flow control (RTS/CTS flow
control) in the DTE interface and within GSM engine, type the following AT command:
AT+IFC=2, 2
This setting is stored volatile, for use after restart. AT+IFC=2, 2 should be stored to the user profile
with AT&W.
Hardware flow control achieves the data flow control by controlling the RTS/CTS line. When the data
transfer is suspended, the CTS line is set inactive until the transfer from the receiving buffer has been
completed. When the receiving buffer is ready to receive more data, CTS goes active once again.

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To achieve hardware flow control, ensure that the RTS/CTS lines are available on your application
platform.

1.5. Unsolicited Result Codes

A URC is a report message sent from the ME to the TE. An unsolicited result code can be delivered
automatically when an event occurs, reflect changes in system state, or act as the result of a query the
ME received before. It is often delivered due to occurrences of errors in executing the queries. However, a
URC is not issued as a direct response to an executed AT command. AT commands have their own
implementations to validate inputs such as “OK” or “ERROR”.
Typical URCs may be information about incoming calls, received SMS, changing temperature, status of
the battery, etc. A summary of URCs is listed in Chapter 16.6.

When sending a URC, the ME activates its Ring Interrupt (Logic “l”), i.e. the line goes active low for a few
milliseconds. If an event which delivers a URC coincides with the execution of an AT command, the URC
will be output after command execution has been completed.

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2

General Commands

2.1. ATI
ATI

Display Product Identification Information

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Display Product Identification Information

Execution Command
ATI

Response
TA issues product information tex
Quectel_Ltd

Revision: 
OK

Maximum Response Time
Reference
V.25ter

Parameter



Example

300ms

Identifier of device type

Revision of software release

ATI
Quectel_Ltd
Quectel_MC20
Revision: MC20CAR01A01
OK

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2.2. AT+GMI
AT+GMI

Request Manufacturer Identification

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_Ltd

Revision: MTK 0828

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OK

Maximum Response Time
Reference
V.25ter

Parameter


300ms

Identifier of device type

2.3. AT+GMM

Request TA Model Identification

AT+GMM Request TA Model Identification
Test Command
AT+GMM=?

Execution Command
AT+GMM

Response
OK

Response
TA returns a product model identification text.

OK

Maximum Response Time

300ms

Reference
V.25ter

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Parameter


Identifier of device type

2.4. AT+GMR Request TA Revision Identification of Software Release
AT+GMR Request TA Revision Identification of Software Release
Test Command
AT+GMR=?

Response
OK

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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
Reference
V.25ter

Parameter


300ms

Revision of software release

Example

AT+GMR
Revision: MC20CAR01A01
OK

2.5. AT+GOI
AT+GOI

Request Global Object Identification

Request Global Object Identification

Test Command
AT+GOI=?

Response
OK

Execution Command

Response

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TA reports one or more lines of information text which permit
the user to identify the device, based on the ISO system for
registering unique object identifiers.


AT+GOI

OK
Maximum Response Time

300ms

Reference
V.25ter

Parameter


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Identifier of device type

NOTE

See X.208, 209 for the format of . For example, in MC20 wireless module, string “MC20” is
displayed.

2.6. AT+CGMI
AT+CGMI

Request Manufacturer Identification

Request Manufacturer Identification

Test Command
AT+CGMI=?

Response
OK

Execution Command
AT+CGMI

Response
TA returns manufacturer identification text.
Quectel_Ltd

Revision: MTK 0828
OK

Maximum Response Time

300ms

Reference
GSM 07.07

Parameter


Identifier of device type

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2.7. AT+CGMM
AT+CGMM

Request Model Identification

Request Model Identification

Test Command
AT+CGMM=?

Response
OK

Execution Command
AT+CGMM

Response
TA returns product model identification text.

OK

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Maximum Response Time
Reference
GSM 07.07

Parameter


300ms

Identifier of device type

2.8. AT+CGMR

Request TA Revision Identification of Software Release

AT+CGMR Request TA Revision Identification of Software Release
Test Command
AT+CGMR=?

Response
OK

Execution Command
AT+CGMR

Response
TA returns product software version identification text.
Revision: 
OK

Maximum Response Time
Reference
GSM 07.07

300ms

Parameter


Product software version identification text

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2.9. AT+GSN
AT+GSN

Request International Mobile Equipment Identity (IMEI)

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 permits the user to identify
the individual ME device.


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OK

Maximum Response Time
Reference
V.25ter

Parameter


300ms

IMEI of the ME

NOTE

The serial number (IMEI) is varied with the individual ME device.

2.10. AT+CGSN

Request Product Serial Number Identification

(Identical with +GSN)

AT+CGSN Request Product Serial Number Identification (Identical with +GSN)
Test Command
AT+CGSN=?

Execution Command
AT+CGSN

Response
OK
Response

OK

Maximum Response Time

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Reference
GSM 07.07

NOTE
See AT+GSN.

2.11. AT+QGSN

Request Product Serial Number Identification (IMEI)

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AT+QGSN Request Product Serial Number Identification (IMEI)
Test Command
AT+QGSN=?

Execution Command
AT+QGSN

Response
OK

Response
+QGSN: 
OK

Maximum Response Time
Reference

Parameter


NOTE

300ms

A string parameter which indicates the IMEI of the ME

The serial number (IMEI) is varied with the individual ME device.

Example

AT+QGSN
+QGSN: "865734020000749"

//Query the IMEI

OK

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2.12. AT&F
AT&F

Set All Current Parameters to Manufacturer Defaults

Set All Current Parameters to Manufacturer Defaults

Execution Command
AT&F[]

Response
TA sets all current parameters to the manufacturer defined
profile.
OK

Maximum Response Time

300ms

Reference
V.25ter

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Parameter


0

NOTE

Set all TA parameters to manufacturer defaults

The command resets AT command settings to their factory default values. However, it does not change
the current baud rate of UART.

2.13. AT&V
AT&V

Display Current Configuration

Display Current Configuration

Execution Command
AT&V[]

Response
TA returns the current parameter setting.
ACTIVE PROFILE

OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


0

Profile number

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Table 2: Current Configuration List When Executing AT&V Command
AT&V or AT&V0
AT&V
ACTIVE PROFILE
E: 1
Q: 0
V: 1
X: 4
S0: 0
S2: 43
S3: 13
S4: 10
S5: 8
S6: 2
S7: 60
S8: 2
S10: 15
+CR: 0
+FCLASS: 0
+CMGF: 0
+CSDH: 0
+ILRR: 0
+CMEE: 1
+CBST: 7,0,1
+IFC: 0,0
+ICF: 3,3
+CNMI: 2,1,0,0,0
+CSCS: "GSM"
+IPR: 0
&C: 1
&D: 0
+CSTA: 129
+CRLP: 61,61,128,6,0,3
+CCWE: 0
+QSIMSTAT: 0
+CMUX: -1
+CCUG: 0,0,0
+CLIP: 0
+COLP: 0
+CCWA: 0
+CAOC: 1
+CLIR: 0
+CUSD: 0

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+CREG: 0
+QSIMDET: 0,0,0
+QMIC: 4,9,8
+QECHO(NORMAL_AUDIO): 253,96,16388,57351,0
+QECHO(Earphone_AUDIO): 253,0,10756,57351,1
+QECHO(LoudSpk_AUDIO): 224,96,5256,57351,2
+QSIDET(NORMAL_AUDIO): 80
+QSIDET(HEADSET_AUDIO): 144
+QCLIP: 0
+QCOLP: 0
+CSNS: 0
OK

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2.14. AT&W
AT&W

Store Current Parameters to User Defined Profile

Store Current Parameters to User Defined Profile

Execution Command
AT&W[]

Response
TA stores the current parameter setting in the user defined
profile.
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


NOTE

0

Profile number to store current parameters

The profile defined by user is stored in nonvolatile memory.

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2.15. ATQ
ATQ

Set Result Code Presentation Mode

Set Result Code Presentation Mode

Execution Command
ATQ[]

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 =0:
OK
If =1:
(none)

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Maximum Response Time
Reference
V.25ter

Parameter


0
1

2.16. ATV
ATV

300ms

TA transmits result code
Result codes are suppressed and not transmitted

TA Response Format

TA Response Format

Execution Command
ATV[]

Response
This parameter setting determines the contents of the header
and trailer transmitted with result codes and information
responses.
When =0
0
When =1
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


0

Information response: 

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Short result code format: 
Information response: 
Long result code format: 

1

NOTE
The result codes, their numeric equivalents and brief descriptions of the use of each are listed in the
following table.

Example
ATV1
OK
AT+CSQ
+CSQ: 30,0
OK
ATV0
0
AT+CSQ
+CSQ: 30,0
0

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//Set =1

//When =1, the result code is OK
//Set =0

//When =0, the result code is 0

Table 3: ATV0&ATV1 Result Codes Numeric Equivalents and Brief Descriptions
ATV1

ATV0

Description

0

Acknowledges execution of a command

1

A connection has been established; the DCE is moving
from command state to online data state

2

The DCE has detected an incoming call signal from
network

3

The connection has been terminated or the attempt to
establish a connection is 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

OK
CONNECT
RING
NO CARRIER

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remote ringing followed by five seconds of silence was
not detected before expiration of the connection timer
(S7)
PROCEEDING

9

An AT command is being processed

CONNECT 

Manufacturer-specific

Same as CONNECT, but includes manufacturerspecific text that may specify DTE speed, line speed,
error control, data compression, or other status

2.17. ATX

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Set CONNECT Result Code Format and Monitor Call

Progress
ATX

Set CONNECT Result Code Format and Monitor Call Progress

Execution Command
ATX[]

Response
This parameter setting determines whether or not the TA
detected the presence of a dial tone or busy signal, and
whether or not the TA transmits particular result codes.
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


0

1
2
3
4

CONNECT result code only returned; dial tone and busy signal detection are
both disabled
CONNECT result code only returned; dial tone and busy signal
detection are both disabled
CONNECT result code returned; dial tone detection is enabled, while
busy signal detection is disabled
CONNECT result code returned; dial tone detection is disabled, while
busy signal detection is enabled
CONNECT result code returned; dial tone and busy signal detection
are both enabled

NOTES
1.
2.

If parameter is omitted, the command has the same behavior as ATX0.
The factory default is =4.

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2.18. ATZ

Set All Current Parameters to User Defined Configurations

ATZ Set all Current Parameters to User Defined Configurations
Execution Command
ATZ[]

Response
TA sets all current parameters to the user defined
configurations.
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


NOTES
1.
2.
3.
4.

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0

Reset to profile number 0

The command 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 commands on the same command line are ignored.
The command won‟t change the current baud rate of UART.
If the user profile is invalid, it will default to the factory default profile.

2.19. AT+CFUN

Set Phone Functionality

AT+CFUN Set Phone Functionality
Test Command
AT+CFUN=?

Response
+CFUN: (list of supported s), (list of supported s)
OK

Read Command
AT+CFUN?

Response

+CFUN: 
OK

Write Command
AT+CFUN=[,]

Response
OK
If error is related to ME functionality:

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+CME ERROR: 
Maximum Response Time

15s, determined by network.

Reference
GSM 07.07

Parameter




0
1
4
0
1

Example

Minimum functionality
Full functionality (Default)
Disable phone from both transmitting and receiving RF signals
Do not reset the ME before setting it to  power level
This is default when  is not given
Reset the ME before setting it to  power level

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AT+CFUN=0
+CPIN: NOT READY
OK
AT+COPS?
+COPS: 0

OK
AT+CPIN?
+CME ERROR: 13
AT+CFUN=1
OK
+CPIN: SIM PIN
AT+CPIN=1234
+CPIN: READY
OK
Call Ready
AT+CPIN?
+CPIN: READY

OK
AT+COPS?
+COPS: 0,0,"CHINA MOBILE"

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//Switch phone to minimum functionality

//Not registered to any operator

//SIM failure
//Switch phone to full functionality

//Registered to an operator

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OK

2.20. AT+QPOWD

Power off

AT+QPOWD Power off
Write Command
AT+QPOWD=

Response
When =0
OK
When =1
NORMAL POWER DOWN

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Maximum Response Time
Reference

Parameter


0
1

Example

300ms

Urgent power off (Do not send out URC "NORMAL POWER DOWN")
Normal power off (Send out URC "NORMAL POWER DOWN")

AT+QPOWD=0
OK
AT+QPOWD=1
NORMAL POWER DOWN

2.21. AT+CMEE
AT+CMEE

//Urgent power off: returns OK

//Normal power off: sends out URC“NORMAL
POWER DOWN”

Report Mobile Equipment Error

Report Mobile Equipment Error

Test Command
AT+CMEE=?

Response
+CMEE: (list of supported s)
OK

Read Command
AT+CMEE?

Response
+CMEE: 
OK

Write Command

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AT+CMEE=[]

TA disables or enables the use of result code +CME ERROR:
 as an indication of an error related to the functionality of
the ME.
OK

Maximum Response Time

300ms

Reference
GSM 07.07

Parameter


0
1
2

Example

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Disable result code
Enable result code and use numeric values
Enable result code and use verbose values

AT+CMEE=0
OK
AT+CPIN=1234
ERROR
AT+CMEE=1
OK
AT+CPIN=1234
+CME ERROR: 10
AT+CMEE=2

//Disable result code

//Only “ERROR” will be displayed
//Enable error result code with numeric values

//Enable error result code with verbose (string)
values

OK
AT+CPIN=1234
+CME ERROR: SIM not inserted

2.22. AT+CSCS
AT+CSCS

Select TE Character Set

Select TE Character Set

Test Command
AT+CSCS=?

Response
+CSCS: (list of supported s)
OK

Read Command
AT+CSCS?

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Response
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OK
Write Command
AT+CSCS=

Response
Set character set  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
GSM 07.07

Parameter


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"GSM"
"HEX"
"IRA"
"PCCP437"
"UCS2"
"8859-1"

Example
AT+CSCS?
+CSCS: "GSM"

GSM default alphabet
Character strings consist only of hexadecimal numbers from 00 to FF
International reference alphabet
PC character set code
UCS2 alphabet
ISO 8859 Latin 1 character set

//Query the current character set

OK
AT+CSCS="UCS2"
OK
AT+CSCS?
+CSCS: "UCS2"
OK

//Set the character set to “UCS2”

2.23. AT+GCAP Request Complete TA Capabilities List
AT+GCAP Request Complete TA Capabilities List
Test Command
AT+GCAP=?

Response
OK

Execution Command
AT+GCAP

Response
TA reports a list of additional capabilities.
+GCAP: 

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OK
Maximum Response Time

300ms

Reference
V.25ter

Parameter


+CGSM
+FCLASS

GSM function is supported
FAX function is supported

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3

Serial Interface Control Commands

3.1. AT&C
AT&C

Set DCD Function Mode

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Set DCD Function Mode

Execution Command
AT&C[]

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

Parameter


0
1

3.2. AT&D
AT&D

DCD line is always ON
DCD line is ON only in the presence of data carrier

Set DTR Function Mode

Set DTR Function Mode

Execution Command
AT&D[]

Response
This parameter determines how the TA responds when circuit
108/2 (DTR) is changed from ON to OFF condition during
data mode.
OK

Maximum Response Time

300ms

Reference
V.25ter

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Parameter


0
1
2

TA ignores status on DTR
ONOFF on DTR: Change to command mode while remaining the connected call
ONOFF on DTR: Disconnect data call, and then change to command mode.
During state DTR=OFF, auto-answer is off

3.3. AT+ICF Set TE-TA Control Character Framing
AT+ICF

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Set TE-TA Control Character Framing

Test Command
AT+ICF=?

Response
+ICF: (list of supported s), (list of supported
s)
OK

Read Command
AT+ICF?

Response
+ICF: ,
OK

Write Command
AT+ICF=[,]

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

Parameter




1
2
3
4
5
6
0
1
2
3

8 data 0 parity 2 stop
8 data 1 parity 1 stop
8 data 0 parity 1 stop
7 data 0 parity 2 stop
7 data 1 parity 1 stop
7 data 0 parity 1 stop
Odd
Even
Mark
Space

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NOTES
1.
2.

The command is applied for command state.
The  field is ignored if the  field specifies no parity.

3.4. AT+IFC
AT+IFC

Set TE-TA Local Data Flow Control

Set TE-TA Local Data Flow Control

Test Command
AT+IFC=?

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Response
+IFC: (list of supported s), (list of supported
s)
OK

Read Command
AT+IFC?

Response
+IFC: ,
OK

Write Command
AT+IFC=,

Response
This parameter setting determines the data flow control on
the serial interface for data mode.
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter




Specifies the method that will be used by TE when receiving data from TA
0
None
1
XON/XOFF
2
RTS flow control
Specifies the method that will be used by TA when receiving data from TE
0
None
1
XON/XOFF
2
CTS flow control

Example
AT+IFC=2,2
OK

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AT+IFC?
+IFC: 2,2
OK

3.5. AT+ILRR

Set TE-TA Local Data Rate Reporting Mode

AT+ILRR Set TE-TA Local Data Rate Reporting Mode
Test Command
AT+ILRR=?

Response
+ILRR: (list of supported s)

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OK

Read Command
AT+ILRR?

Response
+ILRR: 
OK

Write Command
AT+ILRR=[]

Response
This parameter setting determines whether or not an
intermediate result code of local rate is reported when the
connection is established. The rate is applied after the final
result code of the connection is transmitted to TE.
OK

Maximum Response Time

300ms

Reference
V.25ter

Parameter


NOTE

0
1

Disables reporting of local port rate
Enables reporting of local port rate

If the  is set to 1, the following intermediate result will come out on connection to indicate the port
rate settings.
+ILRR: 

Port rate setting on call connection in Baud per second
300
1200
2400

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4800
9600
14400
19200
28800
38400
57600
115200

3.6. AT+IPR

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Set TE-TA Fixed Local Rate

AT+IPR Set TE-TA Fixed Local Rate
Test Command
AT+IPR=?

Response
+IPR: (list of supported auto detectable s),(list of
supported fixed-onlys)
OK

Read Command
AT+IPR?

Response
+IPR: 
OK

Write Command
AT+IPR=

Maximum Response Time
Reference
V.25ter

Parameter


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 set by the
command takes effect.
OK
300ms

Baud rate per second
0 (Autobauding)
75
150
300
600
1200

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2400
4800
9600
14400
19200
28800
38400
57600
115200

NOTES
1.
2.

3.
4.
5.

Example
AT+IPR=115200
OK
AT&W

OK
AT+IPR?
+IPR: 115200
OK

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The default configuration of AT+IPR is adaptive baud rate enabled (AT+IPR=0).
If a fixed baud rate is set, make sure that both TE (DTE, usually external processor) and TA (DCE,
Quectel GSM module) are configured to the same rate. If adaptive baud rate is enabled, the TA could
automatically recognize the baud rate currently used by the TE after receiving “AT” or “at” string.
The value of AT+IPR cannot be restored with AT&F and ATZ, but it is still storable with AT&W and
visible in AT&V.
In multiplex mode, the baud rate cannot be changed by the write command AT+IPR=, and the
setting is invalid and not stored even if AT&W is executed after the write command.
A selected baud rate takes effect after the write commands are executed and acknowledged by “OK”.

//Set fixed baud rate to 115200bps

//Store current setting, that is, the serial
communication speed is 115200bps after restart
module

3.6.1. Adaptive Baud Rate

To take advantage of adaptive baud rate mode, specific attention must be paid to the following
requirements:
1.

Adaptive baud rate synchronization between TE and TA.
 Ensure that TE and TA are correctly synchronized and the baud rate used by the TE is detected
by the TA. The baud rate can be synchronized simply by use an “AT” or “at” string. This is

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

2.

necessary after customer activates adaptive baud rate or when customer starts up the module
with adaptive baud rate enabled.
It is recommended to wait for 2 to 3 seconds before sending the first “AT” or “at” string after the
module is started up with adaptive baud rate enabled. Otherwise undefined characters might be
returned.

Restriction on adaptive baud rate operation.
 The serial interface shall be used with 8 data bits, no parity and 1 stop bit (factory setting).
 The command “A/” can‟t be used.
 Only the string “AT” or “at” can be detected (either “AT” or “at”).
 URCs that may be issued before the TA detect a new baud rate by receiving the first AT
character, and they will be sent at the previously detected baud rate.
 If TE‟s baud rate is changed after TA has recognized the earlier baud rate, loss of
synchronization between TE and TA would be encountered and an “AT” or “at” string must be
re-sent by TE to regain synchronization on baud rate. To avoid undefined characters during
baud rate resynchronization and the possible malfunction of resynchronization, it is not
recommended to switch TE‟s baud rate when adaptive baud rate is enabled. Especially, this
operation is forbidden in data mode.

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3.

Adaptive baud rate and baud rate after restarting.
 In the adaptive baud rate mode, the detected baud rate is not saved. Therefore,
resynchronization is required after restarting the module.
 Unless the baud rate is determined, an incoming CSD call can‟t be accepted. This must be taken
into account when adaptive baud rate and auto-answer mode (ATS0≠0) are enabled at the
same time, especially if SIM PIN 1 authentication is done automatically and the setting ATS0≠0
is stored to the user profile with AT&W.
 Until the baud rate is synchronized, URCs after restarting will not be output when adaptive baud
rate is enabled.

4.

Adaptive baud rate and multiplex mode.
If adaptive baud rate is active, it is not recommended to switch to multiplex mode.

5.

Adaptive baud rate and Windows modem.
 The baud rate used by Windows modem can be detected while setting up a dial-up GPRS/CSD
connection. However, some Windows modem drivers switch TE‟s baud rate to default value
automatically after the GPRS call is terminated. In order to prevent no response to the Windows
modem when it happens, it is not recommended to establish the dial-up GPRS/CSD connection
in adaptive baud rate mode.
 Based on the same considerations, it is also not recommended to establish the FAX connection
in adaptive baud rate mode for PC FAX application, such as WinFax.

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NOTE
To assure reliable communication and avoid any problem caused by undetermined baud rate between
DCE and DTE, it is strongly recommended to configure a fixed baud rate and save it instead of using
adaptive baud rate after start-up.

3.7. AT+CMUX
AT+CMUX

Multiplexer Control

Multiplexer Control

Test Command
AT+CMUX=?

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Response
+CMUX: (list of supported s), (s),
(s),(s),(s),(s),(s),(s),
(s)
OK

Read Command
AT+CMUX?

Response
+CMUX: ,0,5,127,10,3,30,10,2
OK
ERROR

Write Command
AT+CMUX=[[,[,[,[,[,[,[,[,]]]]]]]]]

Response
OK
+CME ERROR: 

Maximum Response Time

300ms

Reference
GSM 07.07

Parameter






Multiplexer transparency mechanism
0
Basic option
The way by which the multiplexer control channel is set up
0
UIH frames used only
Transmission rate
5
115200bit/s
Maximum frame size
127
Acknowledgement timer in a unit of ten milliseconds
10

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Maximum number of re-transmissions
3
Response timer for the multiplexer control channel in a unit of ten milliseconds
30
Wake up response timers in seconds
10
Window size, for advanced operation with Error Recovery options
2





NOTES
1.
2.
3.

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Advanced option with Error Recovery options is not supported.
The multiplexing transmission rate is fixed according to the current serial baud rate. It is
recommended to enable multiplexing protocol under 115200bps baud rate.
Multiplexer control channels are listed as follows:
Channel Number
Type
DLCI
None
Multiplexer Control
0
1
07.07 and 07.05
1
2
07.07 and 07.05
2
3
07.07 and 07.05
3
4
07.07 and 07.05
4

3.8. AT+QEAUART
AT+QEAUART

Configure Dual UART Function

Configure Dual UART Function

Test Command
AT+QEAUART=?

Response
+QEAUART: (list of supported s),
OK

Read Command
AT+QEAUART?

Response
+QEAUART: ,
OK
ERROR

Write Command
AT+QEAUART=,

Response
OK
If error is related to ME functionality
+CME ERROR: 

Maximum Response Time

300ms

Reference
Quectel

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Parameter



0
1
2
99

Disable dual UART function
Enable dual UART function
Uart 2 as debug port
No uart port used as debug port

NOTES
1. When dual UART function is enabled, the Debug UART port can be used to execute AT commands.
About Debug UART port, please refer to MC20 Hardware Design document.
2. The Aux UART port cannot be used to execute data transmission-related AT commands. It is used for
modem communication with MC20‟s embedded GNSS engine.

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3.9. AT+QSEDCB
AT+QSEDCB
Test Command
AT+QSEDCB=?

Configure Parameters of the Dual UART

Configure Parameters of the Dual UART

Response
+QSEDCB: (list of supported s), (list of supported
s), (list of supported s), (list of
supported s)
OK

Read Command
AT+QSEDCB?

Response
+QSEDCB: ,,,
OK
ERROR

Write Command
AT+QSEDCB=,,
,

Response
OK

If error is related to ME functionality:
+CME ERROR: 

Maximum Response Time

300ms

Reference
Quectel

Parameter


Baud rate

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NOTES
1.
2.

1200
2400
4800
9600
14400
19200
28800
38400
57600
115200
Data bits
5
6
7
8
Stop bits
1
2
3
Parity
0
None
1
Odd
2
Even
3
Mark

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This command can be saved by AT&W.
When dual UART port function is enabled, the AT+QSEDCB command will be executed successfully;
otherwise it will return an error.

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4

Status Control Commands

4.1. AT+CEER

Extended Error Report

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AT+CEER Extended Error Report
Test Command
AT+CEER=?

Response
OK

Execution Command
AT+CEER

Response
TA returns an extended report of the reason for the last call
release.
+CEER: ,
OK

Maximum Response Time
Reference
GSM 07.07

Parameter



Example
AT+CEER
+CEER: 0,0

300ms

Location ID as number code. Location IDs are listed in Chapter 8.3.1.
Each ID is related with another table that contains a list of s.
Reason for last call release as number code. The number codes are listed in
several tables, sorted by different categories. The tables can be found proceeding
from the Location ID given in Chapter 8.3.1.

//Query error reporting in normal state, return “No error”

OK
ATD10086;
OK
AT+CLCC
+CLCC: 1,0,0,0,0,"10086",129,""

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OK
NO CARRIER
AT+CEER

//Established a call and the remote party hangs up the call
//Query error reporting, the =1 means “Cause
for protocol stack (PS) layer”, =16 means
“Normal call clearing”

+CEER: 1,16
OK

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4.2. AT+CPAS
AT+CPAS

Mobile Equipment Activity Status

Mobile Equipment Activity Status

Test Command
AT+CPAS=?

Response
+CPAS: (list of supported s)
OK

Execution Command
AT+CPAS

Response
TA returns the activity status of ME.
+CPAS: 

OK
If error is related to ME functionality:
+CME ERROR: 

Maximum Response Time
Reference
GSM 07.07

Parameter


0
2
3
4

300ms

Ready
Unknown (ME is not guaranteed to respond to instructions)
Ringing
Call in progress or call hold

Example
AT+CPAS
+CPAS: 0

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OK
ATD10086;
OK
AT+CLCC
+CLCC: 1,0,3,0,0,"10086",129,""
OK
AT+CPAS
+CPAS: 3

//An incoming call is ringing

OK
AT+CLCC
+CLCC: 1,0,0,0,0,"10086",129,""
OK
AT+CPAS
+CPAS: 4
OK

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4.3. AT+QINDRI

//Call in progress

Indicate RI When Using URC

AT+QINDRI Indicate RI When Using URC
Test Command
AT+QINDRI=?

Response
+QINDRI: (list of supported s)
OK

Read Command
AT+QINDRI?

Response
+QINDRI: 
OK

Write Command
AT+QINDRI=

Response
OK
ERROR

Maximum Response Time

300ms

Reference
Quectel

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Parameter


0
1

Off
On

4.4. AT+QMOSTAT
AT+QMOSTAT

Show State of Mobile Originated Call

Show State of Mobile Originated Call

Test Command
AT+QMOSTAT=?

Response
+QMOSTAT: (list of supported s)

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OK

Read Command
AT+QMOSTAT?

Response
+QMOSTAT: 
OK

Write Command
AT+QMOSTAT=

Response
OK
ERROR

Maximum Response Time

300ms

Reference
Quectel

Parameter


Example

0
1

Do not show call state of mobile originated call
Show call state of mobile originated call. After dialing call numbers, the URC string
of MO RING will be sent if the called party is alerted; and the URC string of MO
CONNECTED will be sent if the call is established

AT+QMOSTAT=1
OK
ATD10086;
OK

//Show call state of mobile originated call

MO RING

//The called party is alerted

MO CONNECTED

//The call is established

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4.5. AT+QREFUSECS
AT+QREFUSECS

Refuse to Receive SMS/Incoming Call or Not

Refuse to Receive SMS/Incoming Call or Not

Test Command
AT+QREFUSECS=?

Response
+QREFUSECS: (list of supported s)[,(list of
supported s)]
OK

Read Command
AT+QREFUSECS?

Response
+QREFUSECS: ,

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OK

Write Command
AT+QREFUSECS=[,]

Response
OK
ERROR

Maximum Response Time

300ms

Reference
Quectel

Parameter



0
1
0
1

4.6. AT+QIURC

Receive the new SMS
Refuse to receive the new SMS
Receive the incoming call
Refuse to receive the incoming call

Enable or Disable Initial URC Presentation

AT+QIURC Enable or Disable Initial URC Presentation
Test Command
AT+QIURC=?

Response
+QIURC: (list of supported s)
OK

Read Command
AT+QIURC?

Response
+QIURC: 
OK

Write Command
AT+QIURC=

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ERROR
Maximum Response Time

300ms

Reference
Quectel

Parameter


NOTE

0
1

Disable URC presentation
Enable URC presentation

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When the module powers on and initialization procedure is over. URC "Call Ready" will be presented if
 is 1.

4.7. AT+QEXTUNSOL Enable/Disable Proprietary Unsolicited
Indications

AT+QEXTUNSOL Enable/Disable Proprietary Unsolicited Indications
Test Command
AT+QEXTUNSOL=?

Response
+QEXTUNSOL: (list of supported s)
OK

Write Command
AT+QEXTUNSOL=,

Response
OK
ERROR

Maximum Response Time

300ms

Reference
Quectel

Parameter
 String type. Values currently reserved by the present document
"SQ"
Signal Quality Report. Displays signal strength and channel bit error rate (similar
to AT+CSQ) in form +CSQN: ,  when values change.
"FN"
Forbidden network available only. When returning to a non-registered state, this
indicates whether all the available PLMNs are forbidden.

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"MW"

"UR"

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"BC"

"BM"
"SM"

"CC"



0
1
2

SMS Message waiting. On receiving an SMS (as indicated by the +CMTI
indication) the SMS is decoded and checked to see if it contains one or more of
the message waiting indications (i.e. voicemail, email, fax, etc.). If so, an
unsolicited indication is shown in the form for each message type:
+QMWT: ,,,,,, where 
is the message store containing the SM; index is the message index and ;
, ,  contain the number of waiting messages (with „0‟
defined as clear indication, non-zero for one or more waiting messages) or blank
for not specified in this message.
Unsolicited result code. Produces an unsolicited indication in the following call
state transition. Multiple notifications may occur for the same transition +QGURC:
, where  describes the current call state:
:
0 Terminated active call, at least one held call remaining
1 Attempt to make an Mobile Originated Call
2 Mobile Originated Call has failed for some reason
3 Mobile Originated Call is ringing
4 Mobile Terminated Call is queued (Call waiting)
5 Mobile Originated Call now has been connected
6 Mobile Originated or Mobile Terminated Call has been disconnected
7 Mobile Originated or Mobile Terminated Call is hung up.
8 Mobile Originated Call dialed a non-emergency number in emergency
mode
9 No answer for Mobile Originated Call
10 Remote number busy for Mobile Originated Call
Battery Charge. Displays battery connection status and battery charge level
(similar to AT+CBC) in form +CBCN: , when values change.
Band mode. Displays band mode (similar to AT+QBAND) in form +QBAND:
 when value changes.
Additional SMS Information. Displays additional information about SMS events in
the form of unsolicited messages of the following format +TSMSINFO:  where  is a standard CMS error in the format
defined by the AT+CMEE command i.e. either a number or a string.
Call information. Displays the disconnected call ID and the remaining call
numbers after one of the calls is disconnected. +CCINFO: ,
Disable
Enable
Query

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4.8. AT+QINISTAT
AT+QINISTAT

Query State of Initialization

Query State of Initialization

Test Command
AT+QINISTAT=?

Response
OK

Execution Command
AT+QINISTAT

Response
+QINISTAT: 
OK

Maximum Response Time
Reference
Quectel

Parameter


NOTE

0
1
2
3

300ms

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No initialization
Ready to execute AT command
Phonebook has finished initialization
SMS has finished initialization

When  is 3, it also means initialization of SIM card related functions has been finished.

4.9. AT+QNSTATUS
AT+QNSTATUS

Query GSM Network Status

Query GSM Network Status

Test Command
AT+QNSTATUS=?

Response
OK

Execution Command
AT+QNSTATUS

Response
+QNSTATUS: 
OK

If error is related to ME functionality:
+CME ERROR: 
Maximum Response Time

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Reference
Quectel

Parameter


255
0
1
2

Not ready to retrieve network status
Work in normal state
No available cell
Only limited service is available

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4.10. AT+QNITZ
AT+QNITZ

Network Time Synchronization

Network Time Synchronization

Test Command
AT+QNITZ=?

Response
+QNITZ: (list of supported s)
OK

Read Command
AT+QNITZ?

Response
+QNITZ: 
OK

Write Command
AT+QNITZ=

Response
OK

If error is related to ME functionality:
+CME ERROR: 

Maximum Response Time
Reference
Quectel

Parameter