SIM800 Series_AT Command Manual_V1.09 Series AT Manual V1.09

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SIM800%2BSeries_AT%2BCommand%2BManual_V1.09

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SIM800%20Series_AT%20Command%20Manual_V1.09

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SIM800 Series_AT Command
Manual_V1.09

Smart Machine Smart Decision

Document Title:

SIM800 Series AT Command Manual

Version:

1.09

Date:

2015-08-03

Status:

Release

Document Control ID:

SIM800 Series_AT Command Manual_V1.09

General Notes
SIMCom offers this information as a service to its customers, to support application and
engineering efforts that use the products designed by SIMCom. The information provided is based
upon requirements specifically provided to SIMCom by the customers. SIMCom has not
undertaken any independent search for additional relevant information, including any information
that may be in the customer’s possession. Furthermore, system validation of this product designed
by SIMCom within a larger electronic system remains the responsibility of the customer or the
customer’s system integrator. All specifications supplied herein are subject to change.
Copyright
This document contains proprietary technical information which is the property of Shanghai
SIMCom Wireless Solutions Ltd, copying of this document and giving it to others and the using or
communication of the contents thereof, are forbidden without express authority. Offenders are
liable to the payment of damages. All rights reserved in the event of grant of a patent or the
registration of a utility model or design. All specification supplied herein are subject to change
without notice at any time.
Copyright © Shanghai SIMCom Wireless Solutions Ltd. 2015

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Contents
Version History.........................................................................................14
1 Introduction............................................................................................22
1.1 Scope of the document .......................................................................................22
1.2 Related documents..............................................................................................22
1.3 Conventions and abbreviations ..........................................................................22
1.4 AT Command syntax ..........................................................................................22
1.4.1 Basic syntax ...................................................................................................................23
1.4.2 S Parameter syntax.........................................................................................................23
1.4.3 Extended Syntax.............................................................................................................23
1.4.4 Combining AT commands on the same Command line.................................................23
1.4.5 Entering successive AT commands on separate lines.....................................................24

1.5 Supported character sets .....................................................................................24
1.6 Flow control .......................................................................................................24
1.6.1 Software flow control (XON/XOFF flow control).........................................................24
1.6.2 Hardware flow control (RTS/CTS flow control)............................................................25

1.7 Definitions ..........................................................................................................25
1.7.1 Parameter Saving Mode .................................................................................................25
1.7.2 Max Response Time.......................................................................................................26

2 AT Commands According to V.25TER ................................................27
2.1 Overview of AT Commands According to V.25TER .........................................27
2.2 Detailed Description of AT Commands According to V.25TER ........................28
2.2.1 A/ Re-issues the Last Command Given.......................................................................28
2.2.2 ATA Answer an Incoming Call....................................................................................28
2.2.3 ATD Mobile Originated Call to Dial A Number..........................................................29
2.2.4 ATD> Originate Call to Phone Number in Current Memory................................31
2.2.5 ATD> Originate Call to Phone Number in Memory Which Corresponds to
Field ...............................................................................................................................32
2.2.6 ATDL Redial Last Telephone Number Used ...............................................................34
2.2.7 ATE Set Command Echo Mode ..................................................................................35
2.2.8 ATH Disconnect Existing Connection.........................................................................35
2.2.9 ATI Display Product Identification Information .........................................................35
2.2.10 ATL Set Monitor speaker loudness............................................................................36
2.2.11 ATM Set Monitor Speaker Mode ..............................................................................36
2.2.12 +++ Switch from Data Mode or PPP Online Mode to Command Mode ..................36
2.2.13 ATO Switch from Command Mode to Data Mode....................................................37
2.2.14 ATP Select Pulse Dialling..........................................................................................37
2.2.15 ATQ Set Result Code Presentation Mode..................................................................38
2.2.16 ATS0 Set Number of Rings before Automatically Answering the Call.....................38
2.2.17 ATS3 Set Command Line Termination Character .....................................................39

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2.2.18 ATS4 Set Response Formatting Character ................................................................39
2.2.19 ATS5 Set Command Line Editing Character.............................................................40
2.2.20 ATS6 Pause Before Blind Dialling............................................................................41
2.2.21 ATS7 Set Number of Seconds to Wait for Connection Completion ..........................41
2.2.22 ATS8 Set Number of Seconds to Wait for Comma Dial Modifier Encountered in
Dial String of D Command .....................................................................................................42
2.2.23 ATS10 Set Disconnect Delay after Indicating the Absence of Data Carrier..............42
2.2.24 ATT Select Tone Dialing ...........................................................................................43
2.2.25 ATV TA Response Format .......................................................................................43
2.2.26 ATX Set CONNECT Result Code Format and Monitor Call Progress .....................44
2.2.27 ATZ Reset Default Configuration .............................................................................45
2.2.28 AT&C Set DCD Function Mode ...............................................................................45
2.2.29 AT&D Set DTR Function Mode................................................................................46
2.2.30 AT&F Factory Defined Configuration ......................................................................46
2.2.31 AT&V Display Current Configuration ......................................................................47
2.2.32 AT&W Store Active Profile ......................................................................................47
2.2.33 AT+GCAP Request Complete TA Capabilities List ..................................................49
2.2.34 AT+GMI Request Manufacturer Identification .........................................................49
2.2.35 AT+GMM Request TA Model Identification ............................................................50
2.2.36 AT+GMR Request TA Revision Identification of Software Release.........................50
2.2.37 AT+GOI Request Global Object Identification .........................................................51
2.2.38 AT+GSN Request TA Serial Number Identification (IMEI) .....................................51
2.2.39 AT+ICF Set TE-TA Control Character Framing........................................................52
2.2.40 AT+IFC Set TE-TA Local Data Flow Control ..........................................................53
2.2.41 AT+IPR Set TE-TA Fixed Local Rate .......................................................................54
2.2.42 AT+HVOIC Disconnect Voice Call Only..................................................................55

3 AT Commands According to 3GPP TS 27.007.....................................56
3.1 Overview of AT Command According to 3GPP TS 27.007 ...............................56
3.2 Detailed Descriptions of AT Command According to 3GPP TS 27.007 ............57
3.2.1 AT+CACM Accumulated Call Meter (ACM) Reset or Query....................................57
3.2.2 AT+CAMM Accumulated Call Meter Maximum (ACM max) Set or Query .............58
3.2.3 AT+CAOC Advice of Charge .....................................................................................59
3.2.4 AT+CBST Select Bearer Service Type........................................................................60
3.2.5 AT+CCFC Call Forwarding Number and Conditions Control ....................................61
3.2.6 AT+CCWA Call Waiting Control ................................................................................63
3.2.7AT+CEER Extended Error Report ...............................................................................64
3.2.8 AT+CGMI Request Manufacturer Identification ........................................................67
3.2.9 AT+CGMM Request Model Identification..................................................................67
3.2.10 AT+CGMR Request TA Revision Identification of Software Release ......................68
3.2.11 AT+CGSN Request Product Serial Number Identification (Identical with +GSN)...68
3.2.12 AT+CSCS Select TE Character Set ...........................................................................69
3.2.13 AT+CSTA Select Type of Address ............................................................................70
3.2.14 AT+CHLD Call Hold and Multiparty........................................................................70

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3.2.15 AT+CIMI Request International Mobile Subscriber Identity....................................71
3.2.16 AT+CLCC List Current Calls of ME.........................................................................72
3.2.17 AT+CLCK Facility Lock...........................................................................................73
3.2.18 AT+CLIP Calling Line Identification Presentation ...................................................75
3.2.19 AT+CLIR Calling Line Identification Restriction.....................................................76
3.2.20 AT+CMEE Report Mobile Equipment Error.............................................................77
3.2.21 AT+COLP Connected Line Identification Presentation ............................................78
3.2.22 AT+COPS Operator Selection...................................................................................80
3.2.23 AT+CPAS Phone Activity Status...............................................................................81
3.2.24 AT+CPBF Find Phonebook Entries...........................................................................82
3.2.25 AT+CPBR Read Current Phonebook Entries ............................................................83
3.2.26 AT+CPBS Select Phonebook Memory Storage.........................................................84
3.2.27 AT+CPBW Write Phonebook Entry ..........................................................................85
3.2.28 AT+CPIN Enter PIN..................................................................................................86
3.2.29 AT+CPWD Change Password...................................................................................87
3.2.30 AT+CR Service Reporting Control ...........................................................................88
3.2.31 AT+CRC Set Cellular Result Codes for Incoming Call Indication ...........................89
3.2.32 AT+CREG Network Registration..............................................................................90
3.2.33 AT+CRLP Select Radio Link Protocol Parameters ...................................................92
3.2.34 AT+CRSM Restricted SIM Access ...........................................................................92
3.2.35 AT+CSQ Signal Quality Report ................................................................................93
3.2.36 AT+VTD Tone Duration............................................................................................94
3.2.37 AT+VTS DTMF and Tone Generation ......................................................................95
3.2.38 AT+CMUX Multiplexer Control...............................................................................96
3.2.39 AT+CNUM Subscriber Number................................................................................97
3.2.40 AT+CPOL Preferred Operator List............................................................................98
3.2.41 AT+COPN Read Operator Names.............................................................................99
3.2.42 AT+CFUN Set Phone Functionality........................................................................100
3.2.43 AT+CCLK Clock.....................................................................................................101
3.2.44 AT+CSIM Generic SIM Access ..............................................................................101
3.2.45 AT+CALM Alert Sound Mode................................................................................102
3.2.46 AT+CALS Alert Sound Select.................................................................................103
3.2.47 AT+CRSL Ringer Sound Level...............................................................................104
3.2.48 AT+CLVL Loud Speaker Volume Level .................................................................104
3.2.49 AT+CMUT Mute Control........................................................................................105
3.2.50 AT+CPUC Price Per Unit and Currency Table........................................................106
3.2.51 AT+CCWE Call Meter Maximum Event ................................................................107
3.2.52 AT+CBC Battery Charge.........................................................................................108
3.2.53 AT+CUSD Unstructured Supplementary Service Data...........................................108
3.2.54 AT+CSSN Supplementary Services Notification ....................................................109

4 AT Commands According to 3GPP TS 27.005...................................112
4.1 Overview of AT Commands According to 3GPP TS 27.005............................ 112
4.2 Detailed Descriptions of AT Commands According to 3GPP TS 27.005......... 112

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4.2.1 AT+CMGD
4.2.2 AT+CMGF
4.2.3 AT+CMGL
4.2.4 AT+CMGR
4.2.5 AT+CMGS
4.2.6 AT+CMGW
4.2.7 AT+CMSS
4.2.8 AT+CNMI
4.2.9 AT+CPMS
4.2.10 AT+CRES
4.2.11 AT+CSAS
4.2.12 AT+CSCA
4.2.13 AT+CSCB
4.2.14 AT+CSDH
4.2.15 AT+CSMP
4.2.16 AT+CSMS

Delete SMS Message............................................................................. 112
Select SMS Message Format ................................................................. 113
List SMS Messages from Preferred Store.............................................. 114
Read SMS Message ............................................................................... 117
Send SMS Message................................................................................120
Write SMS Message to Memory ..........................................................121
Send SMS Message from Storage ..........................................................123
New SMS Message Indications ..............................................................124
Preferred SMS Message Storage ............................................................126
Restore SMS Settings............................................................................127
Save SMS Settings ................................................................................128
SMS Service Center Address ................................................................129
Select Cell Broadcast SMS Messages ...................................................130
Show SMS Text Mode Parameters .......................................................131
Set SMS Text Mode Parameters ...........................................................132
Select Message Service.........................................................................133

5 AT Commands for SIM Application Toolkit ......................................135
5.1 Overview ..........................................................................................................135
5.2 Detailed Descriptions of Commands................................................................135
5.2.1 AT+STKTRS STK Terminal Response.....................................................................135
5.2.2 AT+STKENVS STK Envelope Command................................................................136
5.2.3 AT+STKCALL STK call setup .................................................................................137
5.2.4 AT+STKSMS STK SMS delivery.............................................................................138
5.2.5 AT+STKSS STK SS setup ........................................................................................138
5.2.6 AT+STKUSSD STK USSD setup .............................................................................139
5.2.7 AT+STKDTMF STK sending DTMF .......................................................................139
5.2.8 +STKPCI STK Proactive Command Indication .......................................................140
5.2.9 AT+STKMENU STK Main menu command ............................................................141
5.2.10 AT+STKPCIS STK URC switch command ............................................................141

6 AT Commands Special for SIMCom ..................................................143
6.1 Overview ..........................................................................................................143
6.2 Detailed Descriptions of Commands................................................................145
6.2.1 AT+SIDET
Change the Side Tone Gain Level.......................................................145
6.2.2 AT+CPOWD Power off............................................................................................146
6.2.3 AT+SPIC Times Remained to Input SIM PIN/PUK.................................................146
6.2.4 AT+CMIC Change the Microphone Gain Level.......................................................146
6.2.5 AT+CALA Set Alarm Time......................................................................................148
6.2.6 AT+CALD Delete Alarm..........................................................................................149
6.2.7 AT+CADC Read ADC .............................................................................................149
6.2.8 AT+CSNS Single Numbering Scheme .....................................................................150
6.2.9 AT+CDSCB Reset Cell Broadcast............................................................................151
6.2.10 AT+CMOD Configure Alternating Mode Calls .....................................................151

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6.2.11 AT+CFGRI Indicate RI When Using URC ............................................................151
6.2.12 AT+CLTS Get Local Timestamp............................................................................152
6.2.13 AT+CLDTMF Local DTMF Tone Generation .......................................................154
6.2.14 AT+CDRIND CS Voice/Data Call Termination Indication ...................................155
6.2.15 AT+CSPN Get Service Provider Name from SIM ..................................................156
6.2.16 AT+CCVM Get and Set the Voice Mail Number on the SIM .................................156
6.2.17 AT+CBAND Get and Set Mobile Operation Band .................................................157
6.2.18 AT+CHF Configure Hands Free Operation.............................................................158
6.2.19 AT+CHFA Swap the Audio Channels .....................................................................159
6.2.20 AT+CSCLK Configure Slow Clock ........................................................................160
6.2.21 AT+CENG Switch on or off Engineering Mode .....................................................161
6.2.22 AT+SCLASS0 Store Class 0 SMS to SIM When Received Class 0 SMS ..............163
6.2.23 AT+CCID Show ICCID ..........................................................................................164
6.2.24 AT+CMTE Set Critical Temperature Operating Mode or Query Temperature ......164
6.2.25 AT+CMGDA Delete All SMS................................................................................165
6.2.26 AT+STTONE Play SIM Toolkit Tone....................................................................166
6.2.27 AT+SIMTONE Generate Specifically Tone...........................................................167
6.2.28 AT+CCPD Enable or Disable Alpha String............................................................168
6.2.29 AT+CGID Get SIM Card Group Identifier.............................................................168
6.2.30 AT+MORING Show State of Mobile Originated Call............................................169
6.2.31 AT+CMGHEX Enable or Disable Sending Non-ASCII Character SMS ...............170
6.2.32 AT+CCODE Configure SMS Code Mode..............................................................170
6.2.33 AT+CIURC Enable or Disable Initial URC Presentation .......................................171
6.2.34 AT+CPSPWD Change PS Super Password ............................................................172
6.2.35 AT+EXUNSOL Enable or Disable Proprietary Unsolicited Indications .................172
6.2.36 AT+CGMSCLASS Change GPRS Multislot Class ................................................173
6.2.37 AT+CDEVICE View Current Flash Device Type ..................................................174
6.2.38 AT+CCALR Call Ready Query ..............................................................................174
6.2.39 AT+GSV Display Product Identification Information.............................................174
6.2.40 AT+SGPIO Control the GPIO .................................................................................175
6.2.41 AT+SPWM Generate the Pulse-Width-Modulation ................................................176
6.2.42 AT+ECHO Echo Cancellation Control ...................................................................176
6.2.43 AT+CAAS Control Auto Audio Switch ..................................................................177
6.2.44 AT+SVR Configure Voice Coding Type for Voice Calls.........................................178
6.2.45 AT+GSMBUSY Reject Incoming Call....................................................................179
6.2.46 AT+CEMNL Set the List of Emergency Number ...................................................180
6.2.47 AT*CELLLOCK Set the List of ARFCN Which Needs to Be Locked...................181
6.2.48 AT+SLEDS Set the Timer Period of Net Light .......................................................182
6.2.49 AT+CBUZZERRING Use the Buzzer Sound as the Incoming Call Ring...............183
6.2.50 AT+CEXTERNTONE Close or Open the Microphone...........................................183
6.2.51 AT+CNETLIGHT Close the Net Light or Open It to Shining ................................184
6.2.52 AT+CWHITELIST Set the White List ....................................................................185
6.2.53 AT+CSDT Switch on or off Detecting SIM Card...................................................186
6.2.54 AT+CSMINS SIM Inserted Status Reporting.........................................................186

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6.2.55 AT+CSGS Netlight Indication of GPRS Status .....................................................187
6.2.56 AT+CMICBIAS Close or Open the MICBIAS ......................................................188
6.2.57 AT+DTAM Set TTS and RECORD Play Mode in Call .........................................189
6.2.58 AT+SJDR Set Jamming Detection Function ...........................................................189
6.2.59 AT+CPCMCFG Set PCM Parameter ......................................................................191
6.2.60 AT+CPCMSYNC Set PCM Sync Parameter...........................................................192
6.2.61 AT+CANT Antenna Detecting ................................................................................193
6.2.62 AT+CAGCSET Close or Open AGC Function .......................................................194
6.2.63 AT+SD2PCM SD and PCM Switch Function.........................................................194
6.2.64 AT+SKPD Keypad Detecting Function...................................................................195
6.2.65 AT+SIMTONEX Custom Tones ...............................................................................196
6.2.66 AT+CROAMING Roaming State..............................................................................197
6.2.67 AT+CNETSCAN Perform a Net Survey to Show All the Cells’ Information...........197
6.2.68 AT+CMNRP Dual Serial Port Feature....................................................................198
6.2.69 AT+CEGPRS Switch on or off EDGE ...................................................................199
6.2.70 AT+CGPIO Control the GPIO by PIN Index ..........................................................200
6.2.71 AT+CMEDPLAY Play Audio File ..........................................................................201
6.2.72 AT+CMEDIAVOL Control the Volume when Playing Audio File..........................202
6.2.73 AT+SNDLEVEL Set the Sound Level of Special AT Command ............................202
6.2.74 AT+ECHARGE Charge Control.............................................................................203
6.2.75 AT+SIMTIMER Modify the Poll Interval Time Requested by SIM Card .............204
6.2.76 AT+SPE Speech Enhancement Control..................................................................204
6.2.77 AT+CCONCINDEX Report Concatenated SMS Index ..........................................205
6.2.78 AT+SDMODE SD Mode Switch Function .............................................................205
6.2.79 AT+SRSPT Control SMS Retransmission..............................................................206

7 AT Commands for GPRS Support ......................................................208
7.1 Overview of AT Commands for GPRS Support...............................................208
7.2 Detailed Descriptions of AT Commands for GPRS Support............................208
7.2.1 AT+CGATT Attach or Detach from GPRS Service ..................................................208
7.2.2 AT+CGDCONT Define PDP Context .......................................................................209
7.2.3 AT+CGQMIN Quality of Service Profile (Minimum Acceptable) ...........................210
7.2.4 AT+CGQREQ Quality of Service Profile (Requested) ............................................. 211
7.2.5 AT+CGACT PDP Context Activate or Deactivate ....................................................213
7.2.6 AT+CGDATA Enter Data State .................................................................................214
7.2.7 AT+CGPADDR Show PDP Address .........................................................................214
7.2.8 AT+CGCLASS GPRS Mobile Station Class.............................................................215
7.2.9 AT+CGEREP Control Unsolicited GPRS Event Reporting ......................................216
7.2.10 AT+CGREG Network Registration Status ..............................................................217
7.2.11 AT+CGSMS Select Service for MO SMS Messages ..............................................218

8 AT Commands for TCPIP Application Toolkit ..................................220
8.1 Overview ..........................................................................................................220
8.2 Detailed Descriptions of Commands................................................................221

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8.2.1 AT+CIPMUX Start Up Multi-IP Connection ............................................................221
8.2.2 AT+CIPSTART Start Up TCP or UDP Connection...................................................221
8.2.3 AT+CIPSEND Send Data Through TCP or UDP Connection...................................223
8.2.4 AT+CIPQSEND Select Data Transmitting Mode .....................................................225
8.2.5 AT+CIPACK Query Previous Connection Data Transmitting State..........................226
8.2.6 AT+CIPCLOSE Close TCP or UDP Connection .....................................................227
8.2.7 AT+CIPSHUT Deactivate GPRS PDP Context ........................................................227
8.2.8 AT+CLPORT Set Local Port .....................................................................................228
8.2.9 AT+CSTT Start Task and Set APN, USER NAME, PASSWORD...........................229
8.2.10 AT+CIICR Bring Up Wireless Connection with GPRS or CSD .............................230
8.2.11 AT+CIFSR Get Local IP Address............................................................................230
8.2.12 AT+CIPSTATUS Query Current Connection Status ...............................................231
8.2.13 AT+CDNSCFG Configure Domain Name Server...................................................232
8.2.14 AT+CDNSGIP Query the IP Address of Given Domain Name...............................233
8.2.15 AT+CIPHEAD Add an IP Head at the Beginning of a Package Received..............234
8.2.16 AT+CIPATS Set Auto Sending Timer .....................................................................234
8.2.17 AT+CIPSPRT Set Prompt of ‘>’ When Module Sends Data...................................235
8.2.18 AT+CIPSERVER Configure Module as Server ......................................................236
8.2.19 AT+CIPCSGP Set CSD or GPRS for Connection Mode ........................................237
8.2.20 AT+CIPSRIP Show Remote IP Address and Port When Received Data ................238
8.2.21 AT+CIPDPDP Set Whether to Check State of GPRS Network Timing ..................239
8.2.22 AT+CIPMODE Select TCPIP Application Mode....................................................239
8.2.23 AT+CIPCCFG Configure Transparent Transfer Mode............................................240
8.2.24 AT+CIPSHOWTP Display Transfer Protocol in IP Head When Received Data.....241
8.2.25 AT+CIPUDPMODE UDP Extended Mode.............................................................242
8.2.26 AT+CIPRXGET Get Data from Network Manually ...............................................243
8.2.27 AT+CIPSCONT Save TCPIP Application Context .................................................245
8.2.28 AT+CIPRDTIMER Set Remote Delay Timer ........................................................246
8.2.29 AT+CIPSGTXT Select GPRS PDP context ...........................................................247
8.2.30 AT+CIPTKA Set TCP Keepalive Parameters.........................................................248

9 AT Commands for IP Application.......................................................249
9.1 Overview ..........................................................................................................249
9.2 Detailed Descriptions of Commands................................................................249
9.2.1 AT+SAPBR

Bearer Settings for Applications Based on IP.......................................249

10 AT Commands for PING Support .....................................................251
10.1 Overview ........................................................................................................251
10.2 Detailed Descriptions of Commands..............................................................251
10.2.1 AT+CIPPING PING Request..................................................................................251
10.2.2 AT+CIPCTL Set the Mode When Receiving an IP Packet .....................................252
10.2.3 AT+CIPFLT Set the Rules of IP Filter ....................................................................253
10.2.4 AT+CIPBEIPING Set the Module to be PING or Not............................................254

11 AT Commands for HTTP Application ..............................................256
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11.1 Overview ........................................................................................................256
11.2 Detailed Descriptions of Commands..............................................................256
11.2.1 AT+HTTPINIT Initialize HTTP Service .................................................................256
11.2.2 AT+HTTPTERM Terminate HTTP Service ............................................................257
11.2.3 AT+HTTPPARA Set HTTP Parameters Value ........................................................257
11.2.4 AT+HTTPDATA Input HTTP Data .........................................................................259
11.2.5 AT+HTTPACTION HTTP Method Action .............................................................259
11.2.6 AT+HTTPREAD Read the HTTP Server Response................................................261
11.2.7 AT+HTTPSCONT Save HTTP Application Context ..............................................262
11.2.8 AT+HTTPSTATUS Read HTTP Status ...................................................................263
11.2.9 AT+HTTPHEAD Read the HTTP Header Information of Server Response...........264

12 AT Commands for FTP Application .................................................265
12.1 Overview ........................................................................................................265
12.2 Detailed Descriptions of Commands..............................................................266
12.2.1 AT+FTPPORT Set FTP Control Port ......................................................................266
12.2.2 AT+FTPMODE Set Active or Passive FTP Mode ..................................................266
12.2.3 AT+FTPTYPE Set the Type of Data to Be Transferred...........................................267
12.2.4 AT+FTPPUTOPT Set FTP Put Type .......................................................................268
12.2.5 AT+FTPCID Set FTP Bearer Profile Identifier .......................................................268
12.2.6 AT+FTPREST Set Resume Broken Download .......................................................269
12.2.7 AT+FTPSERV Set FTP Server Address ..................................................................269
12.2.8 AT+FTPUN Set FTP User Name ............................................................................270
12.2.9 AT+FTPPW Set FTP Password ...............................................................................271
12.2.10 AT+FTPGETNAME Set Download File Name ....................................................272
12.2.11 AT+FTPGETPATH Set Download File Path.........................................................272
12.2.12 AT+FTPPUTNAME Set Upload File Name .........................................................273
12.2.13 AT+FTPPUTPATH Set Upload File Path..............................................................273
12.2.14 AT+FTPGET Download File ................................................................................274
12.2.15 AT+FTPPUT Set Upload File ...............................................................................275
12.2.16 AT+FTPSCONT Save FTP Application Context ..................................................276
12.2.17 AT+FTPDELE Delete Specified File in FTP Server .............................................277
12.2.18 AT+FTPSIZE Get the Size of Specified File in FTP Server .................................278
12.2.19 AT+FTPSTATE Get the FTP State ........................................................................279
12.2.20 AT+FTPEXTPUT Extend Upload File.....................................................................279
12.2.21 AT+FTPMKD Make Directory on the Remote Machine ......................................280
12.2.22 AT+FTPRMD Remove Directory on the Remote Machine ..................................281
12.2.23 AT+FTPLIST List Contents of Directory on the Remote Machine.......................281
12.2.24 AT+FTPGETTOFS Download File and Save in File System ...............................282
12.2.25 AT+FTPPUTFRMFS Upload File from File System. ...........................................283
12.2.26 AT+FTPEXTGET Extend Download File ............................................................285
12.2.27 AT+FTPFILEPUT Load File in RAM from File System then Upolad with
FTPPUT ................................................................................................................................286
12.2.28 AT+FTPQUIT Quit Current FTP Session .............................................................287

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13 AT Commands for GSM Location Application ................................288
13.1 Overview ........................................................................................................288
13.2 Detailed Descriptions of Commands..............................................................288
13.2.1 AT+CIPGSMLOC GSM Location and Time ............................................................288

14 AT Commands for Email Application...............................................290
14.1 Overview ........................................................................................................290
14.2 Detailed Descriptions of Commands..............................................................291
14.2.1 AT+EMAILCID Set Email Bearer Profile Identifier..............................................291
14.2.2 AT+EMAILTO Set Timeout Value of SMTP/POP3 Server Response ..................291
14.2.3 AT+SMTPSRV Set SMTP Server Address and Port..............................................292
14.2.4 AT+SMTPAUTH Set User Name and Password for SMTP Authentication..........293
14.2.5 AT+SMTPFROM Set Sender Address and Name ..................................................294
14.2.6 AT+SMTPRCPT Set the Email Recipient(TO/CC/BCC) Address and Name........295
14.2.7 AT+SMTPSUB Set the Email Subject....................................................................296
14.2.8 AT+SMTPBODY Set the Email Body ...................................................................296
14.2.9 AT+SMTPFILE Set the Email Attachment ............................................................297
14.2.10 AT+SMTPSEND Send the Email .........................................................................298
14.2.11 AT+SMTPFT Transfer the Email Attachment ......................................................299
14.2.12 AT+SMTPCS Set the Email Charset ....................................................................300
14.2.13 AT+POP3SRV Set POP3 Server and Account .....................................................301
14.2.14 AT+POP3IN Log in POP3 Server ........................................................................302
14.2.15 AT+POP3NUM Get Email Number and Total Size..............................................302
14.2.16 AT+POP3LIST Get the Specific Email Size ........................................................303
14.2.17 AT+POP3UIDL Get the Specific Email Unique-id ..............................................304
14.2.18 AT+POP3CMD Get Multi-line Response.............................................................305
14.2.19 AT+POP3READ Read Multi-line Response ........................................................307
14.2.20 AT+POP3DEL Mark the Specific Email to Delete...............................................308
14.2.21 AT+POP3RSET Unmark the Emails that Be Marked as Deleted.........................309
14.2.22 AT+POP3OUT Log Out POP3 Server..................................................................310

15 AT Commands for MMS Application...............................................311
15.1 Overview ........................................................................................................ 311
15.2 Detailed Descriptions of Commands..............................................................312
15.2.1 AT+CMMSCURL Set the URL of the MMS Center..............................................312
15.2.2 AT+CMMSPROTO Set the Protocol Parameter and MMS Proxy .........................312
15.2.3 AT+CMMSCID Set the Network Parameters for MMS.........................................313
15.2.4 AT+CMMSSENDCFG Set the Parameters for Sending MMS ..............................314
15.2.5 AT+CMMSEDIT Enter or Exit Edit Mode.............................................................315
15.2.6 AT+CMMSDOWN Download the File Data or Title from UART.........................316
15.2.7 AT+CMMSDELFILE Delete the File of the Edited MMS by File Index...............317
15.2.8 AT+CMMSSEND Start MMS Sending ..................................................................318
15.2.9 AT+CMMSRECP Add Recipients..........................................................................319

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15.2.10 AT+CMMSCC Add Copy Recipients...................................................................319
15.2.11 AT+CMMSBCC Add Secret Recipients...............................................................320
15.2.12 AT+CMMSDELRECP Delete Recipients ............................................................321
15.2.13 AT+CMMSDELCC Delete Copy Recipients .......................................................321
15.2.14 AT+CMMSDELBCC Delete Secret Recipients ...................................................322
15.2.15 AT+CMMSRECV Receive MMS ........................................................................323
15.2.16 AT+CMMSVIEW Get the MMS into Buffer and Show the Information.............324
15.2.17 AT+CMMSREAD Read the Given File of the MMS in the Buffer......................325
15.2.18 AT+CMMSRDPUSH Read the Information of the MMS PUSH Message..........325
15.2.19 AT+CMMSUA Set User Agent ............................................................................327
15.2.20 AT+CMMSPROFILE Set User Agent Profile ......................................................328
15.2.21 AT+CMMSTIMEOUT Set MMS Timeout...........................................................328
15.2.22 AT+CMMSSTATUS Get MMS Status ................................................................329
15.2.23 AT+CMMSINIT Initialize MMS Function...........................................................330
15.2.24 AT+CMMSTERM Exit MMS Function ...............................................................330
15.2.25 AT+CMMSSCONT Save MMS Context..............................................................331

16 AT Commands for DDET Application..............................................333
16.1 Overview ........................................................................................................333
16.2 Detailed Descriptions of Commands..............................................................333
16.2.1 AT+DDET

DTMF Detection Control.....................................................................333

17 AT Commands for RECORD Application ........................................335
17.1 Overview ........................................................................................................335
17.2 Detailed Descriptions of Commands..............................................................335
17.2.1 AT+CREC Record Operation..................................................................................335
17.2.2 AT+CRECORD Record and Send Data to UART...................................................338

18 AT Commands for TTS Application .................................................340
18.1 Overview ........................................................................................................340
18.2 Detailed Descriptions of Commands..............................................................340
18.2.1 AT+CTTS TTS Operation.......................................................................................340
18.2.2 AT+CTTSPARAM Set Parameters of the TTS Playing ..........................................341
18.2.3 AT+CTTSRING Enable/Disable TTS Play During Incoming Call Ring................342

19 Supported Unsolicited Result Codes .................................................343
19.1 Summary of CME ERROR Codes .................................................................343
19.2 Summary of CMS ERROR Codes .................................................................346
19.3 Summary of Unsolicited Result Codes ..........................................................350

20 AT Commands Examples ..................................................................355
20.1 Profile Commands ..........................................................................................355
20.2 SIM Commands..............................................................................................356
20.3 General Commands ........................................................................................358

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20.4 Call Control Commands .................................................................................359
20.5 SIM Toolkit Commands .................................................................................361
20.6 Audio Commands ...........................................................................................361
20.7 SMS Commands.............................................................................................361
20.8 GPRS Commands...........................................................................................362
20.9 TCPIP Commands ..........................................................................................364
20.10 IP Commands ...............................................................................................365
20.11 PING Commands..........................................................................................365
20.12 HTTP and FTP Commands ..........................................................................366
20.13 GSM Location Commands ...........................................................................366
20.14 EMAIL Commands ......................................................................................367
20.15 MMS Commands .........................................................................................367
20.16 DDET Commands ........................................................................................368
20.17 RECORD Commands...................................................................................370
20.18 TTS Commands............................................................................................371

21 ATC Differences among SIM800 Series...........................................373
21.1 AT+SIDET......................................................................................................373
21.2 AT+CMIC.......................................................................................................373
21.3 AT+CBAND ...................................................................................................374
21.4 AT+CHFA.......................................................................................................374
21.5 AT+SGPIO......................................................................................................375
21.6 AT+SJDR........................................................................................................375
21.7 AT+CREC.......................................................................................................376
21.8 AT+CTTSPARAM .........................................................................................376
21.9 AT+CADC ......................................................................................................376
21.10 AT+CSCLK ..................................................................................................376
21.11 AT+CMMSDOWN.......................................................................................377
21.12 AT+CFGRI ...................................................................................................377
21.13 Only Part of Projects Support Following AT Commands ............................378

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Version History
Version

Date

Chapter

What is new

V1.00
V1.01

New version
2013-07-23

All

Modify GSM 07.05 to 3GPP TS 27.005,modify
GSM 07.07 to 3GPP TS 27.007

1.1 Scope of the document

Add SIM800

2.2.8 ATH

Delete ATH parameter [n]

2.2.12 +++

Change "0.5 second" to "1 second"

2.2.13 ATO

Change "NO CARRIER" to "ERROR"

2.2.26 ATX

Change default value from 0 to 4

2.2.32 AT&W

Add AT+CFGRI,AT+CSGS

2.2.41.1 Auto-bauding

Disable DTR auto-bauding

3.2.14 AT+CHLD

Delete parameter of CHLD

3.2.18 AT+CLIP

Change URC parameter

3.2.51 AT+CRSL

Delete reference Note

3.2.7 AT+CEER

Change description of 34 (emergency call not
possible)

4.2.10 AT+CRES

Delete description of CSCB

4.2.11 AT+CSAS

Delete description of CSCB

6.2.4 AT+CMIC

Add reference Note

6.2.11 AT+CFGRI

Add default value

6.2.16 AT+CCVM

Modify Test Command response information
and parameter description

6.2.18 AT+CHF

Add URC

6.2.26 AT+STTONE

Change  supported range;delete
reference note

6.2.27 AT+SIMTONE

Modify last parameter of Test Command to
10-500000

6.2.48 AT+SLEDS

Modify default value

6.2.55 AT+CSGS

Add ATC

6.2.56 AT+CMICBIAS

Add ATC

8.2.2 AT+CIPSTART

Modify parameter

8.2.15 AT+CIPHEAD

Modify parameter

8.2.20 AT+CIPSRIP

Modify parameter

8.2.23 AT+CIPCCFG

Modify write cmd parameters

8.2.26 AT+CIPRXGET

Add "single IP & multi IP connection"
information

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9.2.1 AT+SAPBR

Modify parameter

12.2.23 AT+FTPLIST

Change "Execution Command" to "Write
Command"

14.2.8 AT+SMTPBODY

Change "Execution Command" to "Write
Command"

14.2.10 AT+SMTPSEND

Modify parameter

14.2.11 AT+SMTPFT

Change "Execution Command" to "Write
Command"

15.2.15 AT+CMMSRECV

Change reference note

15.2.21
AT+CMMSTIMEOUT

Change "milliseconds" to "seconds"

15.2.25 AT+CMMSSCONT

Modify parameter of Execution Command

17.2.1 AT+CREC

Add note

18.2.2 AT+CTTSPARAM

Modify parameter;add note

20.8 GPRS Commands

Modify the CGQREQ example

20.17 RECORD Commands

Add example

3.2.17 AT+CLCK

Add Max Response Time

3.2.22 AT+COPS

Add Max Response Time

3.2.29 AT+CPWD

Add Max Response Time

3.2.28 AT+CPIN

Add Max Response Time

3.2.41 AT+VTS

Add Max Response Time

3.2.44 AT+CPOL

Add Max Response Time

3.2.45 AT+COPN

Add Max Response Time

3.2.54 AT+CPUC

Add Max Response Time

6.2.7 AT+CADC

Add Max Response Time

6.2.23 AT+CCID

Add Max Response Time

7.2.1 AT+CGATT

Add Max Response Time

7.2.5 AT+CGACT

Add Max Response Time

3.2.24 AT+CPBF

Modify description of

max response time

3.2.25 AT+CPBR

Modify description of

max response time

4.2.1 CMGD

Modify description of

max response time

4.2.3 CMGL

Modify description of

max response time

6.2.25 CMGDA

Modify description of

max response time

15.2.8 AT+CMMSSEND

Modify description of

max response time

15.2.15 AT+CMMSRECV

Modify description of

max response time

2.2.16 ATS0

Add parameter saving mode

2.2.20 ATS6

Add parameter saving mode

2.2.21 ATS7

Add parameter saving mode

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V1.02

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2.2.22 ATS8

Add parameter saving mode

2.2.26 ATX

Add parameter saving mode

3.2.4 AT+CBST

Add parameter saving mode

3.2.16 AT+CLCC

Add parameter saving mode

3.2.12 AT+CSCS

Add parameter saving mode

3.2.51 AT+CRSL

Add parameter saving mode

3.2.52 AT+CLVL

Add parameter saving mode

6.2.33 AT+CIURC

Add parameter saving mode

6.2.53 AT_CSDT

Add parameter saving mode

6.2.54 AT+CSMINS

Add parameter saving mode

3.2.32 AT+CREG

Modify parameter save mode

6.2.44 AT+SVR

Modify parameter save mode

7.2.10 AT+CGREG

Modify parameter save mode

3.2.24 AT+CPBS

Delete parameter save mode

3.2.25 AT+CPBW

Delete parameter save mode

2.2.28 AT&C

Modify the format

3.2.5 AT+CCFC

Change error word:  to 

3.2.33 AT+CRLP

Add Save mode and reference

3.2.36 AT+FCLASS

Modify information about +FCLASS

3.2.47 AT+CCLK

Add note

4.2.5 AT+CMGS

Add Note

6.2.18 AT+CHF

Modify parameter range and note

6.2.19 AT+CHFA

Add patameters of write command and test
command,modify note

6.2.20 AT+CSCLK

Add new parameter and note

6.2.24 AT+CMTE

Increase the temperature range

6.2.28 AT+CCPD

Set default value

6.2.33 AT+CIURC

Set default value

6.2.41 AT+SPWM

Modify parameter direction and note

6.2.51 AT+CNETLIGHT

Add test and read command

6.2.53 AT+CSDT

Modify note

6.2.55 AT+CSGS

Modify parameter default value

6.2.56 AT+CMICBIAS

Add default value and modify parameter
description

6.2.57 AT+DTAM

Add AT command

6.2.58 AT+SJDR

Add AT command

6.2.59 AT+CPCMCFG

Add AT command

6.2.60 AT+CPCMSYNC

Add AT command

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6.2.61 AT+CANT

Add AT command

6.2.62 AT+CAGCSET

Add AT command

7.2.9 AT+CGEREP

Modify parameter description and add URC
example

8.2.7 AT+CIPSHUT

Add Max Response Time

8.2.10 AT+CIICR

Add Max Response Time

8.2.21 AT+CIPDPDP

Modify parameter’s scope

8.2.26 AT+CIPRXGET

Modify parameter options

16.2.1 AT+DDET

Add parameter and URC description in write
command,add note

17.2.1 AT+CREC

Modify note

17.2.2 AT+CRECORD

Add AT command

18.2.2 AT+CTTSPARAM

Modify note and parameter default value

20.16 AT+DDET

Modify AT+DDET example

21.5 AT+CTTSPARAM

Add differences of some AT commands

21.6 AT+CHFA

Add differences of some AT commands

AT+CEXTHS,AT+CEXBUT

Delete

All

Add or modify Parameter Saving Mode and
Max Response Time

1.1 Scope of the document

Add SIM800G

2.2.28 AT&C

Modify parameter format

2.2.32 AT&W

Modify parameter stored by &W

2.2.41 AT+IPR

Add parameter description

3.2.6 AT+CCWA

Modify  decription

3.2.24 AT+CPBS

Add “FD” phonebook

3.2.46 AT+CALS

Add parameter  for playing/stopping
tone

5.2.1 AT+STKTRS

Modify the length of parameter

6.2.1 AT+SIDET

Extend parameter 

6.2.4 AT+CMIC

Extend parameter , add default value
description in note

6.2.5 AT+CALA

Modify indicate expired alarm

6.2.13 AT+CLDTMF

Extend parameter  and add
parameter , add the funcion that
local DTMF tone can be played in call.

6.2.56 AT+CMICBIAS

Add note description

6.2.58 AT+SJDR

Modify format error

6.2.63 AT+SD2PCM

Add AT command

6.2.64 AT+SKPD

Add AT command

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V1.04

2014-06-10

6.2.65 AT+SIMTONEX

Add AT command

6.2.66 AT+CROAMING

Add AT command

6.2.67 AT+CNETSCAN

Add AT command

8.2.23 AT+CIPCCFG

Modify wait time’s interval

12.2.24 AT+FTPGETTOFS

Add AT command

16.2.1 AT+DDET

Modify description about  parameter, add
 parameter

17.2.1 AT+CREC

Modify 
and AT+CREC=8
description,add read length limit and AMR
support description in note

18.2.3 AT+CTTSRING

Add command AT+CTTSRING

20.6 Audio command

Add AT+CLDTMF example

20.11 PING Commands

Add other device ping to the modem

21.6 AT+CHFA

Modify description

21.7 AT+CMIC

Add difference desription

21.8 AT+SIDET

Add difference desription

AT+FCLASS
AT+FMI
AT+FMM
AT+FMR

Delete

1.1 Scope of the document

Add SIM800W16, SIM840W16,
SIM800-WB64, SIM808

2.2.27 ATZ

Modify note

2.2.30 AT&F

Modify note

2.2.32 AT&W

Modify note

3.2.46 AT+CALS

Modify  descripton

4.2.8 AT+CNMI

Add the " [alpha>], " string

6.2.1 AT+SIDET

Modify note

6.2.4 AT+CMIC

Modify note

6.2.8 AT+CSNS

Modify parameter save mode

6.2.13 AT+CLDTMF

Modify note

6.2.17 AT+CBAND

Modify note

6.2.18 AT+CHF

Modify note

6.2.19 AT+CHFA

Modify note

6.2.40 AT+SGPIO

Modify note

6.2.41 AT+SPWM

Extend the scope of parameter  to
"0-100000"

6.2.58 AT+SJDR

Modify note

6.2.59 AT+CPCMCFG

Modify note

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V1.05

2014-07-31

6.2.60 AT+CPCMSYNC

Modify note

6.2.62 AT+CANT

Modify note

6.2.63 AT+SD2PCM

Modify note

6.2.64 AT+SKPD

Modify note

6.2.66 AT+CROAMING

Modify AT+CROAMING command’s format

6.2.67 AT+CNETSCAN

Modify AT+CNETSCAN command’s function
and note

6.2.68 AT+CMNRP

Add AT command

8.2.2 AT+CIPSTART

Modify max response time

8.2.30 AT+CIPTKA

Add AT command

10.2.4 AT+CIPBEIPING

Add AT command

12.2.2 AT+FTPMODE

Modify test and write command

12.2.14 AT+FTPGET

Modify note, Add "Manual quit" to 

12.2.23 AT+FTPLIST

Modify note

12.2.24 AT+FTPGETTOFS

Add read command

12.2.25
AT+FTPPUTFRMFS

Add AT command

12.2.26 AT+FTPEXTGET

Add AT command

12.2.27 AT+FTPFILEPUT

Add AT command

12.2.28 AT+FTPQUIT

Add AT command

13.2.1 AT+CIPGSMLOC

Modify max response time

16.2.1 AT+DDET

Modify response value of test command

17.2.1 AT+CREC

Modify parameter description and note

18

Modify note

19.3 URC

Add
URC
of
AT+CGREG,AT+CALA,AT+CIURC,AT+CNMI

20.2 SIM commands

Modify response of AT+CPBS=?

21

Modify ATC difference

21.4 AT+CHFA

Add PCM channel
SIM800-WB64

All

Change SIM800-WB64 to SIM800M64

6.2.21 AT+CENG

Add format description of part parameters

6.2.40 AT+SGPIO

Extend the scope of parameter  to "1-7"

6.2.69 AT+CEGPRS

Add AT command

12.2.24 AT+FTPGETTOFS

Modify description of 

14.2.14 AT+POP3IN

Add description of  value 69

14.2.22 AT+POP3OUT

Add description of  value 69

21.2 AT+CMIC

Modify

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1.06

1.07

1.08

1.09

2014-10-28

2014-12-19

2015-05-12

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21.5 AT+SGPIO

Modify difference

21.9 AT+CADC

Add difference

21.10 AT+CSCLK

Add difference

21.13

Add GPIO difference

6.2.52 AT+CWHITELIST

Extend the scope of parameter  to "0-3"

6.2.70 AT+CGPIO

Add AT command

6.2.71 AT+CMEDPLAY

Add AT command

6.2.72 AT+CMEDIAVOL

Add AT command

8.2.14 AT+CDNSGIP

Add error code

12.2

Modify max response time

17.2.1 AT+CREC

Modify note

19.3

Modify note

1.1 Scope of the document

Add SIM800C

2.2.16 ATS0

Modify note

6.2.20 AT+CSCLK

Modify note

6.2.73 AT+SNDLEVEL

Add AT command

21

Add differences of SIM800C

6.2.55 AT+CSGS

Extend the scope of parameter  to "0-2"

6.2.74 AT+ECHARGE

Add AT command

6.2.75 AT+SIMTIMER

Add AT command

6.2.76 AT+SPE

Add AT command

17.2.1 AT+CREC

Modify note

19.1

Change CME error codes from 810~824 to
600~614

21.13

Add AT+ECHARGE,AT+SIMTIMER,AT+SPE

1.1 Scope of the document

Add SIM800A, SIM800F, SIM800C-DS

6.2.21 AT+CENG

Extend the scope of parameter  to "0-4"
and modify note

6.2.65 AT+SIMTONEX

Modify note

6.2.70 AT+CGPIO

Modify response value of test command

6.2.71 AT+CMEDPLAY

Modify note

6.2.77 AT+CCONCINDEX

Add AT command

6.2.78 AT+SDMODE

Add AT command

6.2.79 AT+SRSPT

Add AT command

11.2.9 AT+HTTPHEAD

Add AT command

15.2.6 AT+CMMSDOWN

Modify  parameter

17.2.1 AT+CREC

Modify note

19.3

Delete URC of "AT+CENG" when =3

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20.2 SIM commands

Add examples of "AT+CENG"

21.11 AT+CMMSDOWN

Add difference of "AT+CMMSDOWN"

21.12 AT+CFGRI

Add difference of "AT+CFGRI"

21

Add differences of SIM800A,SIM800F and
SIM800C-DS

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1 Introduction
1.1 Scope of the document
This document presents the AT Command Set for SIMCom SIM800 Series, including SIM800V,
SIM840V, SIM800W, SIM840W, SIM800W16, SIM840W16, SIM800L, SIM800H, SIM800,
SIM800M64, SIM800G, SIM808, SIM800C, SIM800A, SIM800F and SIM800C-DS.

1.2 Related documents
You can visit the SIMCom Website using the following link:
http://www.sim.com

1.3 Conventions and abbreviations
In this document, the GSM engines are referred to as following term:
ME (Mobile Equipment);
MS (Mobile Station);
TA (Terminal Adapter);
DCE (Data Communication Equipment) or facsimile DCE (FAX modem, FAX board);
In application, controlling device controls the GSM engine by sending AT Command via its
serial interface. The controlling device at the other end of the serial line is referred to as
following term:
TE (Terminal Equipment);
DTE (Data Terminal Equipment) or plainly "the application" which is running on an embedded
system;

1.4 AT Command syntax
The "AT" or "at" or “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 Command set implemented by SIM800 Series is a combination of 3GPP TS 27.005,
3GPP TS 27.007 and ITU-T recommendation V.25ter and the AT commands developed by
SIMCom.
Note: A HEX string such as "00 49 49 49 49 FF FF FF FF" will be sent out through serial
port at the baud rate of 115200 immediately after SIM800 Series is powered on. The string
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shall be ignored since it is used for synchronization with PC tool. Only enter AT Command
through serial port after SIM800 Series is powered on and Unsolicited Result Code "RDY"
is received from serial port. If auto-bauding is enabled, the Unsolicited Result Codes
"RDY" and so on are not indicated when you start up the ME, and the "AT" prefix, or
"at" prefix must be set at the beginning of each command line.
All these AT commands can be split into three categories syntactically: "basic", "S parameter",
and "extended". These are as follows:
1.4.1 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 missing.
1.4.2 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.
1.4.3 Extended Syntax
These commands can operate in several modes, as in the following table:

Table 1: Types of AT commands and responses
Test Command

AT+=?

The mobile equipment returns the list of parameters
and value ranges set with the corresponding Write
Command or by 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+

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

1.4.4 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 type "AT" or "at" the

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beginning of the command line. Please note to use a semicolon as the command delimiter after
an extended command; in basic syntax or S parameter syntax, the semicolon need not enter, for
example: ATE1Q0S0=1S3=13V1X4;+IFC=0,0;+IPR=115200;&W.
The Command line buffer can accept a maximum of 556 characters (counted from the first
command without “AT” or “at” prefix). If the characters entered exceeded this number then none
of the Command will executed and TA will return "ERROR".
1.4.5 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 last AT Command you
entered before you enter the next AT Command.

1.5 Supported character sets
The SIM800 Series AT Command interface defaults to the IRA character set. The SIM800 Series
supports the following character sets:
GSM format
UCS2
HEX
IRA
PCCP
PCDN
8859-1
The character set can be set and interrogated using the "AT+CSCS" Command (3GPP TS
27.007). The character set is defined in GSM specification 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 and SIM Application Toolkit alpha strings.

1.6 Flow control
Flow control is very important for correct communication between the GSM engine and DTE.
For in the case such as a data or fax call, the sending device is transferring data faster than the
receiving side is ready to accept. When the receiving buffer reaches its capacity, the receiving
device should be capable to cause the sending device to pause until it catches up.
There are basically two approaches to achieve data flow control: software flow control and
hardware flow control. SIM800 Series support both two kinds of flow control.
In Multiplex mode, it is recommended to use the hardware flow control.
1.6.1 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
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serial interface.
The default flow control approach of SIM800 Series is hardware flow control (RTS/CTS flow
control), 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 volatile, for use after restart, AT+IFC=1, 1 should be stored to the user
profile with AT&W.
NOTE:
The AT commands listed in the table of AT&W chapter should be stored to user profile with
AT&W for use after restart. Most other AT commands in V.25, 3GPP TS 27.005, 3GPP TS
27.007,GPRS will store parameters automatically and can be used after module restart.
Ensure that any communications software package (e.g. Hyper terminal) uses 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) as the DTE interface may interpret binary data as flow control characters.
1.6.2 Hardware flow control (RTS/CTS flow control)
Hardware flow control achieves the data flow control by controlling the RTS/CTS line. When the
data transfer should be suspended, the CTS line is set inactive until the transfer from the
receiving buffer has completed. When the receiving buffer is ok to receive more data, CTS goes
active once again.
To achieve hardware flow control, ensure that the RTS/CTS lines are present on your application
platform.

1.7 Definitions
1.7.1 Parameter Saving Mode
For the purposes of the present document, the following syntactical definitions apply:
 NO_SAVE: The parameter of the current AT command will be lost if module is rebooted or
current AT command doesn't have parameter.
 AUTO_SAVE: The parameter of the current AT command will be kept in NVRAM
automatically, and it won't be lost if module is rebooted.
 AT&W_SAVE: The parameter of the current AT command will be kept in NVRAM by
sending the command of “AT&W.”
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1.7.2 Max Response Time
Max response time is estimated maximum time to get response, the unit is seconds.
"-" means this AT command doesn’t care the response time.

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2 AT Commands According to V.25TER
These AT Commands are designed according to the ITU-T (International Telecommunication
Union, Telecommunication sector) V.25ter document.

2.1 Overview of AT Commands According to V.25TER
Command

Description

A/

Re-issues the last command given

ATA

Answer an incoming call

ATD

Mobile originated call to dial a number

ATD>

Originate call to phone number in current memory

ATD>

Originate call to phone number in memory which corresponds to field


ATDL

Redial last telephone number used

ATE

Set command echo mode

ATH

Disconnect existing connection

ATI

Display product identification information

ATL

Set monitor speaker loudness

ATM

Set monitor speaker mode

+++

Switch from data mode or ppp online mode to command mode

ATO

Switch from command mode to data mode

ATP

Select pulse dialling

ATQ

Set result code presentation mode

ATS0

Set number of rings before automatically answering the call

ATS3

Set command line termination character

ATS4

Set response formatting character

ATS5

Set command line editing character

ATS6

Pause before blind dialling

ATS7

Set number of seconds to wait for connection completion

ATS8

Set number of seconds to wait for comma dial modifier encountered in
dial string of D command

ATS10

Set disconnect delay after indicating the absence of data carrier

ATT

Select tone dialing

ATV

TA response format

ATX

Set connect result code format and monitor call progress

ATZ

Reset default configuration

AT&C

Set DCD function mode

AT&D

Set DTR function mode

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AT&F

Factory defined configuration

AT&V

Display current configuration

AT&W

Store active profile

AT+GCAP

Request complete TA capabilities list

AT+GMI

Request manufacturer identification

AT+GMM

Request TA model identification

AT+GMR

Request TA revision identification of software release

AT+GOI

Request global object identification

AT+GSN

Request TA serial number identification (IMEI)

AT+ICF

Set TE-TA control character framing

AT+IFC

Set TE-TA local data flow control

AT+IPR

Set TE-TA fixed local rate

AT+HVOIC

Disconnect voice call only

2.2 Detailed Description of AT Commands According to V.25TER
2.2.1 A/
A/

Re-issues the Last Command Given

Re-issues the Last Command Given

Execution
Command
A/

Response
Re-issues the previous Command

Reference
V.25ter

Note

2.2.2 ATA Answer an Incoming Call
ATA Answer an Incoming Call
Execution
Command
ATA

Response
TA sends off-hook to the remote station.
Note1: Any additional commands on the same Command line are ignored.
Note2: 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.
Response in case of data call, if successfully connected
CONNECT TA switches to data mode.
Note:  output only if ATX parameter setting with the
>0
When TA returns to Command mode after call release
OK
Response in case of voice call, if successfully connected

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OK
Response if no connection
NO CARRIER
Parameter Saving NO_SAVE
Mode
Max
Time

Response 20s(voice call)
Timeout set with ATS7 (data call)

Reference
V.25ter
2.2.3 ATD
ATD

Note
See also ATX
Mobile Originated Call to Dial A Number

Mobile Originated Call to Dial A Number

Execution
Command
ATD[
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 the remote station does not answer
NO ANSWER
If connection successful and non-voice call.
CONNECT TA switches to data mode.
Note:  output only if ATX parameter setting with the
 >0
When TA returns to Command mode after call release
OK

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If connection successful and voice call
OK
Parameters

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, @
Emergency call:

Standardized emergency number 112 (no SIM needed)

String of GSM modifiers:
I
Actives CLIR (Disables 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
Parameter Saving NO_SAVE
Mode
Max
Time

Response 20s(voice call)
Timeout set with ATS7 (data call)

Reference
V.25ter

Note
Parameter "I" and "i" only if no *# code is within the dial string
 is default for last number that can be dialed by ATDL
*# codes sent with ATD are treated as voice calls. Therefore, the Command
must be terminated with a semicolon ";"
See ATX Command for setting result code and call monitoring parameters.
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 is
established. The setting is controlled by AT+COLP. Factory default is
AT+COLP=0, this cause the TA returns "OK" immediately after dialing
was completed, otherwise TA will returns "OK", "BUSY", "NO DIAL
TONE", "NO CARRIER".
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.

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The current states of all calls can be easily checked at any time by using the
AT+CLCC Command.

2.2.4 ATD>
ATD>

Originate Call to Phone Number in Current Memory

Originate Call to Phone Number in Current Memory

Execution
Command
ATD>[
][][;]

Response
This Command can be used to dial a phone number from current phonebook
memory.
Note: 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.
If error is related to ME functionality
+CME ERROR: 
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 the remote station does not answer
NO ANSWER
If connection successful and non-voice call.
CONNECT TA switches to data mode.
Note:  output only if ATX parameter setting with the
 >0
When TA returns to Command mode after call release
OK
If successfully connected and voice call
OK
Parameters
 Integer type memory location should be in the range of locations
available in the memory used

String of GSM modifiers:


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I
Override the CLIR supplementary service subscription
default value for this call
Invocation (restrict CLI presentation)
i
Override the CLIR supplementary service subscription
default value for this call
Suppression (allow CLI presentation)

G Control the CUG supplementary service information
for this call
CUG Not supported
g
Control the CUG supplementary service information
for this call
CUG Not supported
<;>
Only required to set up voice call , return to
Command state
Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
Parameter "I" and "i" only if no *# code is within the dial string
*# codes sent with ATD are treated as voice calls. Therefore, the Command
must be terminated with a semicolon ";"
See ATX Command for setting result code and call monitoring parameters.

2.2.5 ATD>
Field 
ATD>


Originate Call to Phone Number in Memory Which Corresponds to

Originate Call to Phone Number in Memory Which Corresponds to Field

Execution
Command
ATD>[][][;]

Response
This Command make the TA attempts to set up an outgoing call to stored
number.
All available memories are searched for the entry .
Note: 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.
If error is related to ME functionality
+CME ERROR: 
If no dial tone and (parameter setting ATX2 or ATX4)
NO DIALTONE

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If busy and (parameter setting ATX3 or ATX4)
BUSY
If a connection cannot be established
NO CARRIER
If the remote station does not answer
NO ANSWER
If connection successful and non-voice call.
CONNECT TA switches to data mode.
Note:  output only if ATX parameter setting with the
 >0
When TA returns to Command mode after call release
OK
If successfully connected and voice call
OK
Parameters

String type (string should be included in quotation marks) value
("x"), which should equal to an alphanumeric field in at least one phone
book entry in the searched memories.  formatted as current TE
character set specified by +CSCS.

String of GSM modifiers:
I Actives CLIR (Disables 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
Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
Parameter "I" and "i" only if no "*#" code is within the dial string
*# codes sent with ATD are treated as voice calls. Therefore, the Command
must be terminated with a semicolon ";"
See ATX Command for setting result code and call monitoring parameters.

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2.2.6 ATDL Redial Last Telephone Number Used
ATDL Redial Last Telephone Number Used
Execution
Command
ATDL

Response
This Command redials the last voice and data call number used.
Note: 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.
If error is related to ME functionality
+CME ERROR: 
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 the remote station does not answer
NO ANSWER
If connection successful and non-voice call.
CONNECT TA switches to data mode.
Note:  output only if ATX parameter setting with the
 >0
When TA returns to Command mode after call release
OK
If successfully connected and voice call
OK

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
See ATX Command for setting result code and call monitoring parameters.
Return the numbers and symbols which ATD supports if there is no last
dialing context.

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2.2.7 ATE
ATE

Set Command Echo Mode

Set Command Echo Mode

Execution
Command
ATE

Response
This setting determines whether or not the TA echoes characters received
from TE during Command state.
OK
Parameters

0 Echo mode off
1 Echo mode on

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.8 ATH
ATH

Note

Disconnect Existing Connection

Disconnect Existing Connection

Execution
Command
ATH

Response
Disconnect existing call by local TE from Command line and terminate call
OK
Note: OK is issued after circuit 109(DCD) is turned off, if it was previously
on.

Parameter Saving NO_SAVE
Mode
Max
Time

Response 20s

Reference
V.25ter
2.2.9 ATI
ATI

Note

Display Product Identification Information

Display Product Identification Information

Execution
Command
ATI

Response
TA issues product information text
Example:
SIM800 R11.08
OK

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Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.10 ATL Set Monitor speaker loudness
ATL Set Monitor speaker loudness
Execution
Command
ATL

Response
OK
Parameters

0..9

Volume

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
No effect in GSM

2.2.11 ATM Set Monitor Speaker Mode
ATM

Set Monitor Speaker Mode

Execution
Command
ATM

Response
OK
Parameters

0..9

Mode

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
No effect in GSM

2.2.12 +++ Switch from Data Mode or PPP Online Mode to Command Mode
+++

Switch from Data Mode or PPP Online Mode to Command Mode

Execution
Command
+++

Response
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 to the remote server.
OK

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To prevent the +++ escape sequence from being misinterpreted as data, it
should comply to following sequence:
No characters entered for T1 time (1 second)
"+++" characters entered with no characters in between (1 second)
No characters entered for T1 timer (1 second)
Switch to Command mode, otherwise go to step 1.
Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
To return from Command mode back to data mode: Enter ATO.

2.2.13 ATO Switch from Command Mode to Data Mode
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.
CONNECT
If connection is not successfully resumed
ERROR
else
TA returns to data mode from command mode CONNECT 
Note:  only if parameter setting ATX>0
Parameter

0

Switch from command mode to data mode.

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.14 ATP Select Pulse Dialling
ATP Select Pulse Dialling
Execution
Command
ATP

Response
OK

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Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
No effect in GSM

2.2.15 ATQ Set Result Code Presentation Mode
ATQ

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)
Parameters

0 TA transmits result code
1 Result codes are suppressed and not transmitted

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.16 ATS0
ATS0

Note

Set Number of Rings before Automatically Answering the Call

Set Number of Rings before Automatically Answering the Call

Read Command
ATS0?

Response

OK
Parameters
See Write Command

Write Command
ATS0=

Response
This parameter setting determines the number of rings before auto-answer.
OK
ERROR
Parameters

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0
Automatic answering is disable.
1-255 Number of rings the modem will wait for before answering
the phone if a ring is detected.

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
If  is set too high, the calling party may hang up before the call can be
answered automatically.
If using cmux port, ATH and AT+CHUP can hang up the call (automatically
answering) only in the CMUX channel 0.
If using dual-physical serial port, ATH and AT+CHUP can hang up the call
(automatically answering) only in UART1.

2.2.17 ATS3 Set Command Line Termination Character
ATS3

Set Command Line Termination Character

Read Command
ATS3?

Response

OK
Parameters
See Write Command

Write Command
ATS3=

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
ERROR
Parameters

13 Command line termination character

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.18 ATS4
ATS4

Note
Default 13 = CR. It only supports default value.
Set Response Formatting Character

Set Response Formatting Character

Read Command

Response

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ATS4?


OK
Parameters
See Write Command

Write Command
ATS4=

Response
This parameter setting determines the character generated by the TA for
result code and information text.
OK
ERROR
Parameters

10 Response formatting character

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
Default 10 = LF. It only supports default value.

2.2.19 ATS5 Set Command Line Editing Character
ATS5

Set Command Line Editing Character

Read Command
ATS5?

Response

OK
Parameters
See Write Command

Write Command
ATS5=

Response
This parameter setting determines the character recognized by TA as a
request to delete from the Command line the immediately preceding
character.
OK
ERROR
Parameters

0-8-127

Response formatting character

Parameter Saving AT&W_SAVE
Mode
Max

Response -

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Time
Reference
V.25ter
2.2.20 ATS6
ATS6

Note
Default 8 = Backspace.
Pause Before Blind Dialling

Pause Before Blind Dialling

Read Command
ATS6?

Response

OK

Write Command
ATS6=

Response
OK
ERROR
Parameters

0..999

Time

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note
No effect in GSM

2.2.21 ATS7 Set Number of Seconds to Wait for Connection Completion
ATS7

Set Number of Seconds to Wait for Connection Completion

Read Command
ATS7?

Response

OK
Parameters
See Write Command

Write Command
ATS7=

Response
This parameter setting determines the amount of time to wait for the
connection completion in case of answering or originating a call.
OK
ERROR
Parameters

1-60-255

Number of seconds to wait for connection completion

Parameter Saving AT&W_SAVE
Mode

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Max
Time

Response -

Reference
V.25ter

Note
If called party has specified a high value for ATS0=, call setup may fail.
The correlation between ATS7 and ATS0 is important
Example: Call may fail if ATS7=30 and ATS0=20.
ATS7 is only applicable to data call.

2.2.22 ATS8 Set Number of Seconds to Wait for Comma Dial Modifier Encountered in
Dial String of D Command
ATS8 Set Number of Seconds to Wait for Comma Dial Modifier Encountered in Dial
String of D Command
Read Command
ATS8?

Response

OK
Parameters
See Write Command

Write Command
ATS8=

Response
OK
ERROR
Parameters

0-255 The value of this register determines how long the modem
should pause when it sees a comma in the dialing string.

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.23 ATS10
ATS10

Note
No effect in GSM
Set Disconnect Delay after Indicating the Absence of Data Carrier

Set Disconnect Delay after Indicating the Absence of Data Carrier

Read Command
ATS10?

Response

OK
Parameters
See Write Command

Write Command
ATS10=

Response
This parameter setting determines the amount of time that the TA will

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remain connected in absence of data carrier. If the data carrier is once more
detected before disconnecting, the TA remains connected.
OK
ERROR
Parameters

1-15-254

Number of tenths seconds of delay

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.24 ATT Select Tone Dialing
ATT Select Tone Dialing
Execution
Command
ATT

Response
OK

Parameter Saving AUTO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.25 ATV

Note

TA Response Format

ATV 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
Parameters

0

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


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The result codes, their numeric equivalents and brief descriptions of the use
of each are listed in the following table.
Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

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
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)

PROCEEDING

9

An AT command is being processed

CONNECT


Manufacturerspecific

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

2.2.26 ATX
ATX

Set CONNECT Result Code Format and Monitor Call Progress

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 dial tone and busy signal and whether or not TA transmits
particular result codes.
OK
ERROR
Parameters

0

CONNECT result code only returned, dial tone and busy

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detection are both disabled.
1 CONNECT result code only returned, dial tone and
busy detection are both disabled.
2 CONNECT result code returned, dial tone
detection is enabled, busy detection is disabled.
3 CONNECT result code returned, dial tone
detection is disabled, busy detection is enabled.
4 CONNECT result code returned, dial tone and
busy detection are both enabled.
Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.27 ATZ

Note

Reset Default Configuration

ATZ Reset Default Configuration
Execution
Command
ATZ[]

Response
TA sets all current parameters to the user defined profile.
OK
ERROR
Parameters

0

Restore profile 0

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

Parameter impacted by Z command: refer to AT&W
NOTE:
Parameters related to uart operation, like csclk, ipr, icf, ifc and cmnrp, will not be reset to
default configuration.
2.2.28 AT&C
AT&C

Set DCD Function Mode

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.

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OK
ERROR
Parameters


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

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter
2.2.29 AT&D
AT&D

Note

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 the ON to the OFF condition during data mode.
OK
ERROR
Parameters

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 call, change to Command
mode. During state DTR = OFF is auto-answer off.

Parameter Saving AT&W_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.30 AT&F Factory Defined Configuration
AT&F Factory Defined Configuration
Execution
Command
AT&F[]

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

0

Set all TA parameters to manufacturer defaults.

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Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

Parameter impacted by &F command: refer to AT&W
NOTE:
Parameters related to uart operation, like csclk, ipr, icf, ifc and cmnrp, will not be reset to
default configuration.
2.2.31 AT&V Display Current Configuration
AT&V Display Current Configuration
Execution
Command
AT&V[]

Response
TA returns the current parameter setting.

OK
ERROR
Parameters

0 Responses in numeric format

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.32 AT&W Store Active Profile
AT&W Store Active Profile
Execution
Command
AT&W[]

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


0

Store the current configuration in profile 0

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

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Reference
V.25ter

Note
The user defined profile is stored in non volatile memory.

Parameter stored by &W
Command

Parameter name

Displayedby &V

ATS0



Y

ATS3



Y

ATS4



Y

ATS5



Y

ATS6



Y

ATS7



Y

ATS8



Y

ATS10



Y

AT+CBST

,,

Y

AT+CRLP

,,,

Y

ATV



Y

ATE



Y

ATQ



Y

ATX



Y

AT&C



Y

AT&D



Y

AT+CLTS



Y

AT+CREG



Y

AT+CGREG



Y

AT+CMEE



Y

AT+CSCLK



Y

AT+CIURC



Y

AT+CFGRI



Y

AT+CMTE



Y

AT+CANT

,,

Y

AT+STKPCIS



Y

AT+CMGF



Y

AT+CNMI

,,,,

Y

AT+CSCS



Y

AT+VTD



Y

AT+CALS



Y

AT+CHF



Y

AT+CAAS



Y

AT+CBUZZERRING



Y

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AT+DDET



Y

AT+MORING



Y

AT+SVR



Y

AT+CCPD



Y

AT+CSGS



Y

AT+CNETLIGHT



Y

AT+SLEDS

,,

Y

AT+CSDT



Y

AT+CSMINS



Y

AT+EXUNSOL



Y

AT+IPR



Y

AT+IFC

, 

Y

AT+ICF

,

Y

AT+SD2PCM



Y

AT+CMNRP



Y

AT+ECHARGE



Y

AT+SIMTIMER



Y

AT+CSNS



Y

AT+FSHEX



Y

2.2.33 AT+GCAP Request Complete TA Capabilities List
AT+GCAP Request Complete TA Capabilities List
Execution
Command
AT+GCAP

Response
TA reports a list of additional capabilities.
+GCAP: list of supported s
OK
Parameters


+CGSM

GSM function is supported

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.34 AT+GMI
AT+GMI

Request Manufacturer Identification

Request Manufacturer Identification

Test Command
AT+GMI=?

Response
OK

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Parameters
Execution
Command
AT+GMI

TA reports one or more lines of information text which permit the user to
identify the manufacturer.
SIMCOM_Ltd
OK

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.35 AT+GMM
AT+GMM

Request TA Model Identification

Request TA Model Identification

Test Command
AT+GMM=?

Response
OK

Execution
Command
AT+GMM

TA reports one or more lines of information text which permit the user to
identify the specific model of device.

OK
Parameters


Product model identification text

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.36 AT+GMR
AT+GMR

Request TA Revision Identification of Software Release

Request TA Revision Identification of Software Release

Test Command
AT+GMR=?

Response
OK

Execution
Command

TA reports one or more lines of information text which permit the user to
identify the revision of software release.

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AT+GMR

Revision: 
OK
Parameters


Revision of software release

Parameter Saving NO_SAVE
Mode
Max
Time

Response -

Reference
V.25ter

Note

2.2.37 AT+GOI
AT+GOI

Request Global Object Identification

Request Global Object Identification

Test Command
AT+GOI=?

Response
OK

Execution
Command
AT+GOI

Response
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.