Telit Wireless Solutions LE910-SKG Installation manual

LE910-SKG AT commands reference guide
80437ST10619A Rev.1 –2014-09-16
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 2 of 273
APPLICABILITY TABLE
PRODUCT
LE910-SKG
SW Version
17.00.543

LE910-SKG AT commands reference guide
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SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
Notice
While reasonable efforts have been made to assure the accuracy of this document, Telit assumes
no liability resulting from any inaccuracies or omissions in this document, or from use of the
information obtained herein. The information in this document has been carefully checked and is
believed to be entirely reliable. However, no responsibility is assumed for inaccuracies or
omissions. Telit reserves the right to make changes to any products described herein and
reserves the right to revise this document and to make changes from time to time in content
hereof with no obligation to notify any person of revisions or changes. Telit does not assume
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LE910-SKG AT commands reference guide
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Usage and Disclosure Restrictions
License Agreements
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by express license agreement only and may be used only in accordance with the terms of such
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Components, units, or third-party products used in the product described herein are NOT fault-
tolerant and are NOT designed, manufactured, or intended for use as on-line control equipment
in the following hazardous environments requiring fail-safe controls: the operation of Nuclear
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Copyright © Telit Communications S.p.A.

LE910-SKG AT commands reference guide
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Contents
1. Introduction.................................................................................................................................... 10
1.1. Scope......................................................................................................................................................10
1.2. Audience................................................................................................................................................10
1.3. Contact Information, Support.............................................................................................................10
1.4. Document Organization.......................................................................................................................10
1.5. Text Conventions..................................................................................................................................11
1.6. Related Documents...............................................................................................................................11
2. Overview......................................................................................................................................... 12
2.1. About the document.............................................................................................................................12
3. AT COMMANDS .......................................................................................................................... 13
3.1. Definitions .............................................................................................................................................13
3.2. AT Command Syntax...........................................................................................................................14
3.2.1. String Type Parameters......................................................................................................................................14
3.2.2. Command Lines.................................................................................................................................................15
ME Error Result Code - +CME ERROR: <err> .......................................................................................17
Message Service Failure Result Code - +CMS ERROR: <err>................................................................19
3.2.3. Information Responses and Result Codes..........................................................................................................20
3.2.4. Command Response Time-Out..........................................................................................................................21
3.2.5. Command Issuing Timing..................................................................................................................................23
3.3. Storage...................................................................................................................................................24
3.3.1. Factory Profile and User Profiles.......................................................................................................................24
4. AT Commands Availability Table ............................................................................................... 27
5. AT Commands References............................................................................................................ 38
5.1. Command Line General Format.........................................................................................................38
5.1.1. Command Line Prefixes ....................................................................................................................................38
Starting A Command Line - AT................................................................................................................38
Last Command Automatic Repetition - A/................................................................................................38
Repeat Last Command - #/........................................................................................................................39
5.1.2. General Configuration Commands ....................................................................................................................39
Select Interface Style - #SELINT..............................................................................................................39
Set Notification Port - #NOPT..................................................................................................................39
5.1.3. Hayes Compliant AT Commands ......................................................................................................................39
Generic Modem Control ...........................................................................................................................39
5.1.3.1.1. Set To Factory-Defined Configuration - &F .......................................................................................39
5.1.3.1.2. Soft Reset - Z.......................................................................................................................................40
5.1.3.1.3. Default Reset Basic Profile Designation - &Y....................................................................................40
5.1.3.1.4. Default Reset Full Profile Designation - &P.......................................................................................40
5.1.3.1.5. Store Current Configuration - &W......................................................................................................41
5.1.3.1.6. Store Telephone Number In The Module Internal Phonebook - &Z...................................................41
5.1.3.1.7. Display Internal Phonebook Stored Numbers - &N............................................................................41
5.1.3.1.8. Manufacturer Identification - +GMI ...................................................................................................42

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5.1.3.1.9. Model Identification - +GMM.............................................................................................................42
5.1.3.1.10. Revision Identification - +GMR........................................................................................................42
5.1.3.1.11. Capabilities List - +GCAP.................................................................................................................42
5.1.3.1.12. Serial Number - +GSN......................................................................................................................42
5.1.3.1.13. Display Current Base Configuration And Profile - &V ....................................................................42
5.1.3.1.14. Display Current Configuration And Profile - &V0...........................................................................42
5.1.3.1.15. S Registers Display - &V1 ................................................................................................................43
5.1.3.1.16. Extended S Registers Display - &V3 ................................................................................................43
5.1.3.1.17. Display Last Connection Statistics - &V2.........................................................................................43
5.1.3.1.18. Single Line Connect Message - \V....................................................................................................43
5.1.3.1.19. Country Of Installation - +GCI .........................................................................................................44
5.1.3.1.20. Line Signal Level - %L .....................................................................................................................44
5.1.3.1.21. Line Quality - %Q.............................................................................................................................44
5.1.3.1.22. Speaker Loudness - L........................................................................................................................44
5.1.3.1.23. Speaker Mode - M.............................................................................................................................44
DTE - Modem Interface Control...............................................................................................................44
5.1.3.2.1. Command Echo - E .............................................................................................................................44
5.1.3.2.2. Quiet Result Codes –Q.......................................................................................................................45
5.1.3.2.3. Response Format - V...........................................................................................................................45
5.1.3.2.4. Extended Result Codes –X.................................................................................................................46
5.1.3.2.5. Identification Information - I...............................................................................................................46
5.1.3.2.6. Data Carrier Detect (DCD) Control - &C ...........................................................................................47
5.1.3.2.7. Data Terminal Ready (DTR) Control - &D.........................................................................................47
5.1.3.2.8. Flow Control - &K ..............................................................................................................................48
5.1.3.2.9. Data Set Ready (DSR) Control - &S...................................................................................................48
5.1.3.2.10. Ring (RI) Control - \R .......................................................................................................................48
5.1.3.2.11. Fixed DTE Interface Rate - +IPR......................................................................................................49
5.1.3.2.12. DTE-Modem Local Flow Control - +IFC .........................................................................................50
5.1.3.2.13. DTE-Modem Character Framing - +ICF...........................................................................................51
Call Control...............................................................................................................................................51
5.1.3.3.1. Dial –D...............................................................................................................................................51
5.1.3.3.2. Tone Dial - T.......................................................................................................................................53
5.1.3.3.3. Pulse Dial - P.......................................................................................................................................54
5.1.3.3.4. Answer –A..........................................................................................................................................54
5.1.3.3.5. Disconnect - H.....................................................................................................................................54
5.1.3.3.6. Return To On Line Mode –O .............................................................................................................54
5.1.3.3.7. Guard Tone - &G ................................................................................................................................54
5.1.3.3.8. Sync/Async Mode - &Q......................................................................................................................55
Modulation Control...................................................................................................................................55
5.1.3.4.1. Line Quality Monitor And Auto Retrain Or Fallback/Fallforward - %E ............................................55
Compression Control ................................................................................................................................55
5.1.3.5.1. Data Compression - +DS.....................................................................................................................55
5.1.3.5.2. Data Compression Reporting - +DR ...................................................................................................55
S Parameters..............................................................................................................................................56
5.1.3.6.1. Number Of Rings To Auto Anwser - S0 .............................................................................................56
5.1.3.6.2. Ring Counter - S1................................................................................................................................56
5.1.3.6.3. Command Line Termination Character - S3 .......................................................................................57
5.1.3.6.4. Response Formatting Character - S4...................................................................................................57
5.1.3.6.5. Command Line Editing Character - S5 ...............................................................................................57
5.1.3.6.6. Connection Completion Time-Out - S7...............................................................................................58
5.1.3.6.7. Carrier Off With Firm Time - S10 ......................................................................................................58
5.1.3.6.8. Delay To DTR Off - S25.....................................................................................................................58
5.1.3.6.9. Delay Before Forced Hang Up –S38..................................................................................................59

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5.1.4. 3GPP TS 27.007 AT Commands.......................................................................................................................60
General......................................................................................................................................................60
5.1.4.1.1. Request Manufacturer Identification - +CGMI...................................................................................60
5.1.4.1.2. Request Model Identification - +CGMM............................................................................................60
5.1.4.1.3. Request Revision Identification - +CGMR .........................................................................................60
5.1.4.1.4. Request Product Serial Number Identification - +CGSN....................................................................60
5.1.4.1.5. Select TE Character Set - +CSCS .......................................................................................................60
5.1.4.1.6. Request International Mobile Subscriber Identity (IMSI) - +CIMI.....................................................61
Call Control...............................................................................................................................................62
5.1.4.2.1. Service Reporting Control - +CR........................................................................................................62
Network Service Handling........................................................................................................................62
5.1.4.3.1. Subscriber Number - +CNUM ............................................................................................................62
5.1.4.3.2. Read Operator Names - +COPN .........................................................................................................63
5.1.4.3.3. Network Registration Report - +CREG...............................................................................................63
5.1.4.3.4. Operator Selection - +COPS ...............................................................................................................65
5.1.4.3.5. Facility Lock/Unlock - +CLCK...........................................................................................................66
5.1.4.3.6. Change Facility Password - +CPWD ..................................................................................................68
5.1.4.3.7. Advice Of Charge - +CAOC...............................................................................................................69
5.1.4.3.8. Preferred Operator List - +CPOL........................................................................................................69
5.1.4.3.9. Selection of preferred PLMN list –+CPLS.........................................................................................70
Mobile Equipment Control .......................................................................................................................70
5.1.4.4.1. Set Phone Functionality - +CFUN ......................................................................................................70
5.1.4.4.2. Enter PIN - +CPIN..............................................................................................................................72
5.1.4.4.3. Indicator Control - +CIND..................................................................................................................73
5.1.4.4.4. Mobile Equipment Event Reporting - +CMER...................................................................................75
5.1.4.4.5. Select Phonebook Memory Storage - +CPBS.....................................................................................75
5.1.4.4.6. Read Phonebook Entries - +CPBR......................................................................................................77
5.1.4.4.7. Find Phonebook Entries - +CPBF.......................................................................................................79
5.1.4.4.8. Write Phonebook Entry - +CPBW ......................................................................................................81
5.1.4.4.9. Read Group Entries - #CPBGR...........................................................................................................83
5.1.4.4.10. Write Group Entry - #CPBGW .........................................................................................................84
5.1.4.4.11. Clock Management - +CCLK ...........................................................................................................84
5.1.4.4.12. Alarm Management - +CALA...........................................................................................................85
5.1.4.4.13. Delete Alarm - +CALD.....................................................................................................................87
5.1.4.4.14. Postpone alarm - +CAPD..................................................................................................................87
5.1.4.4.15. Setting date format - +CSDF.............................................................................................................87
5.1.4.4.16. Setting time format - +CSTF.............................................................................................................88
5.1.4.4.17. Time Zone reporting - +CTZR..........................................................................................................88
5.1.4.4.18. Automatic Time Zone update - +CTZU............................................................................................89
5.1.4.4.19. Restricted SIM Access - +CRSM......................................................................................................90
5.1.4.4.20. Generic SIM Acess - +CSIM ............................................................................................................91
5.1.4.4.21. UICC Application Discovery - +CUAD ...........................................................................................92
5.1.4.4.22. Set voice mail number - +CSVM......................................................................................................92
5.1.4.4.23. Accumulated Call Meter - +CACM ..................................................................................................93
5.1.4.4.24. Accumulated Call Meter Maximum - +CAMM................................................................................93
5.1.4.4.25. Price per Unit and Currency Table - +CPUC....................................................................................94
5.1.4.4.26. Available AT Commands - +CLAC..................................................................................................94
5.1.4.4.27. Open Logical Channel - +CCHO ......................................................................................................94
5.1.4.4.28. Close Logical Channel - +CCHC......................................................................................................95
5.1.4.4.29. Generic UICC Logical Channel Access - +CGLA............................................................................95
5.1.4.4.30. Remaining PIN retries - +CPINR......................................................................................................96
Mobile Equipment Errors..........................................................................................................................97
5.1.4.5.1. Report Mobile Equipment Error - +CMEE.........................................................................................97

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Commands For EPS..................................................................................................................................97
5.1.4.6.1. EPS Attach Or Detach - +CGATT......................................................................................................97
5.1.4.6.2. EPS Event Reporting - +CGEREP......................................................................................................98
5.1.4.6.3. EPS Network Registration Status - +CEREG .....................................................................................99
5.1.4.6.4. Define PDP Context - +CGDCONT .................................................................................................100
5.1.4.6.5. Define Secondary PDP Context - +CGDSCONT .............................................................................101
5.1.4.6.6. Traffic Flow Template - +CGTFT ....................................................................................................102
5.1.4.6.7. Define EPS Quality of Service - +CGEQOS.....................................................................................105
5.1.4.6.8. PDP Context Read Dynamic Parameters - +CGCONTRDP.............................................................106
5.1.4.6.9. Secondary PDP Context Read Dynamic Parameters - +CGSCONTRDP.........................................107
5.1.4.6.10. Traffic Flow Template Read Dynamic Parameters - +CGTFTRDP ...............................................108
5.1.4.6.11. EPS Quality of Service Read Dynamic Parametes - +CGEQOSRDP.............................................109
5.1.4.6.12. Printing IP Address Format - +CGPIAF .........................................................................................110
5.1.4.6.13. PDP Context Activate Or Deactivate - +CGACT ...........................................................................111
5.1.4.6.14. Show PDP Address - +CGPADDR.................................................................................................112
5.1.4.6.15. Modify PDP context - +CGCMOD.................................................................................................113
Commands For Battery Charger .............................................................................................................113
5.1.4.7.1. Battery Charge - +CBC.....................................................................................................................113
5.1.5. 3GPP TS 27.005 AT Commands for SMS and CBS .......................................................................................114
General Configuration.............................................................................................................................114
5.1.5.1.1. Select Message Service - +CSMS .....................................................................................................114
5.1.5.1.2. Preferred Message Storage - +CPMS................................................................................................115
5.1.5.1.3. Message Format - +CMGF................................................................................................................116
Message Configuration ...........................................................................................................................117
5.1.5.2.1. Service Center Address - +CSCA .....................................................................................................117
5.1.5.2.2. Set Text Mode Parameters - +CSMP ................................................................................................117
5.1.5.2.3. Show Text Mode Parameters - +CSDH ............................................................................................120
5.1.5.2.4. Select Cell Broadcast Message Types - +CSCB ...............................................................................120
5.1.5.2.5. Save Settings - +CSAS......................................................................................................................121
5.1.5.2.6. Restore Settings - +CRES .................................................................................................................121
5.1.5.2.7. More Message to Send - +CMMS.....................................................................................................122
Message Receiving And Reading ...........................................................................................................122
5.1.5.3.1. New Message Indications To Terminal Equipment - +CNMI ..........................................................122
5.1.5.3.2. New Message Acknowledgement to ME/TA - +CNMA...................................................................126
5.1.5.3.3. List Messages - +CMGL...................................................................................................................127
5.1.5.3.4. Read Message - +CMGR ..................................................................................................................130
Message Sending And Writing ...............................................................................................................132
5.1.5.4.1. Send Message - +CMGS...................................................................................................................132
5.1.5.4.2. Send Message From Storage - +CMSS.............................................................................................135
5.1.5.4.3. Write Message To Memory - +CMGW ............................................................................................136
5.1.5.4.4. Delete Message - +CMGD................................................................................................................138
5.1.5.4.5. Select service for MO SMS services - +CGSMS..............................................................................140
5.1.6. Telit Custom AT Commands...........................................................................................................................140
General Configuration AT Commands ...................................................................................................140
5.1.6.1.1. Manufacturer Identification - #CGMI...............................................................................................140
5.1.6.1.2. Model Identification - #CGMM........................................................................................................140
5.1.6.1.3. Revision Identification - #CGMR .....................................................................................................141
5.1.6.1.4. Product Serial Number Identification - #CGSN................................................................................141
5.1.6.1.5. International Mobile Subscriber Identity (IMSI) - #CIMI.................................................................141
5.1.6.1.6. Read ICCID (Integrated Circuit Card Identification) - #CCID .........................................................141
5.1.6.1.7. Display PIN Counter - #PCT.............................................................................................................142
5.1.6.1.8. Software Shut Down - #SHDN .........................................................................................................142
5.1.6.1.9. Reboot - #REBOOT..........................................................................................................................142

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5.1.6.1.10. Extended Reset - #Z........................................................................................................................143
5.1.6.1.11. Periodic Reset - #ENHRST.............................................................................................................143
5.1.6.1.12. Wake From Alarm Mode - #WAKE ...............................................................................................144
5.1.6.1.13. Temperature Monitor - #TEMPMON .............................................................................................145
5.1.6.1.14. General Purpose Input/Output Pin Control - #GPIO.......................................................................147
5.1.6.1.15. Alarm Pin - #ALARMPIN ..............................................................................................................149
5.1.6.1.16. STAT_LED GPIO Setting - #SLED ...............................................................................................149
5.1.6.1.17. Save STAT_LED GPIO Setting - #SLEDSAV...............................................................................150
5.1.6.1.18. SMS Ring Indicator - #E2SMSRI ...................................................................................................150
5.1.6.1.19. Read Analog/Digital Converter Input - #ADC................................................................................151
5.1.6.1.20. Auxiliary Voltage Output Control - #VAUX..................................................................................151
5.1.6.1.21. Auxiliary Voltage Output Save - #VAUXSAV...............................................................................152
5.1.6.1.22. V24 Output Pins Configuration - #V24CFG...................................................................................152
5.1.6.1.23. V24 Output Pins Control - #V24.....................................................................................................153
5.1.6.1.24. Battery And Charger Status - #CBC................................................................................................153
5.1.6.1.25. Cell Monitor - #MONI ....................................................................................................................154
5.1.6.1.26. Serving Cell Information - #SERVINFO ........................................................................................155
5.1.6.1.27. Read Current Network Status in E-UTRAN - #RFSTS ..................................................................156
5.1.6.1.28. Query SIM Status - #QSS................................................................................................................158
5.1.6.1.29. Delete All Phonebook Entries - #CPBD..........................................................................................159
5.1.6.1.30. SMS Overflow - #SMOV................................................................................................................159
5.1.6.1.31. Mailbox Numbers - #MBN .............................................................................................................159
5.1.6.1.32. Message Waiting Indication - #MWI..............................................................................................161
5.1.6.1.33. SIM Presence Status - #SIMPR.......................................................................................................162
5.1.6.1.34. Network Timezone - #NITZ............................................................................................................162
5.1.6.1.35. Clock management - #CCLK..........................................................................................................164
5.1.6.1.36. Select Band - #BND........................................................................................................................165
5.1.6.1.37. Automatic Band Selection - #AUTOBND ......................................................................................165
5.1.6.1.38. PPP-GPRS Connection Authentication Type - #GAUTH...............................................................165
5.1.6.1.39. Subscriber number - #SNUM..........................................................................................................166
5.1.6.1.40. SIM Detection Mode-#SIMDET.....................................................................................................166
5.1.6.1.41. Show Address - #CGPADDR .........................................................................................................167
5.1.6.1.42. I2C data via GPIO - #I2CWR .........................................................................................................167
5.1.6.1.43. I2C data from GPIO - #I2CRD........................................................................................................168
5.1.6.1.44. Power Saving Mode Ring Indicator - #PSMRI...............................................................................169
5.1.6.1.45. Command Mode Flow Control - #CFLO ........................................................................................170
5.1.6.1.46. Report concatenated SMS indexes - #CMGLCONCINDEX..........................................................170
5.1.6.1.47. Select language - #LANG ...............................................................................................................171
5.1.6.1.48. RTC Status - #RTCSTAT ...............................................................................................................171
5.1.6.1.49. Network Scan Timer - #NWSCANTMR ........................................................................................171
5.1.6.1.50. Hardware Identification - #HWREV...............................................................................................172
5.1.6.1.51. Dormant Control Command - #CDORM ........................................................................................172

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This document is aimed in providing a detailed specification and a comprehensive listing as a reference
for the whole set of AT command
Readers of this document should be familiar with Telit modules and their ease of controlling by means of
AT Commands.
For general contact, technical support, to report documentation errors and to order manuals, contact
Telit’s Technical Support Center (TTSC) at:
TS-[email protected]
[e-mail]
TS-LATINAMERI[email protected]
[e-mail]
Alternatively, use:
http://www.telit.com/en/products/technical-support-center/contact.php
For detailed information about where you can buy the Telit modules or for recommendations on
accessories and components visit:
http://www.telit.com
To register for product news and announcements or for product questions contact Telit’s Technical
Support Center (TTSC).
Our aim is to make this guide as helpful as possible. Keep us informed of your comments and suggestions
for improvements.
Telit appreciates feedback from the users of our information.
This document contains the following chapters:
Chapter 1: “Introduction” provides a scope for this document, target audience, contact and
support information, and text conventions.

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Chapter 2: “Overview” about the aim of this document and implementation suggestions.
Chapter 3: “AT Commands” The core of this reference guide.
Danger –This information MUST be followed or catastrophic equipment failure or bodily injury may
occur.
Caution or Warning –Alerts the user to important points about integrating the module, if these points
are not followed, the module and end user equipment may fail or malfunction.
Tip or Information –Provides advice and suggestions that may be useful when integrating the
module.
All dates are in ISO 8601 format, i.e. YYYY-MM-DD.
ETSI GSM 07.07 specification and rules
http://www.3gpp.org/ftp/Specs/archive/07_series/07.07/
ETSI GSM 07.05 specification and rules
http://www.3gpp.org/ftp/Specs/archive/07_series/07.05/
Hayes standard AT command set

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This document is to describe all AT commands implemented on the Telit wireless module
LE910-SKG.

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The Telit wireless module family can be controlled via the serial interface using the standard AT
commands
1
. The Telit wireless module family is compliant with:
1. Hayes standard AT command set, in order to maintain the compatibility with existing
SW programs.
2. 3GPP TS 27.007 specific AT command and EPS specific commands.
3. 3GPP TS 27.005 specific AT commands for SMS (Short Message Service) and CBS
(Cell Broadcast Service)
Moreover Telit wireless module family supports also Telit proprietary AT commands for special
purposes.
The following is a description of how to use the AT commands with the Telit wireless module
family.
The following syntactical definitions apply:
<CR> Carriage return character, is the command line and result code terminator character,
which value, in decimal ASCII between 0 and 255,is specified within parameter S3. The
default value is 13.
<LF> Linefeed character, is the character recognized as line feed character. Its value, in
decimal ASCII between 0 and 255, is specified within parameter S4. The default value
is 10. The line feed character is output after carriage return character if verbose result
codes are used (V1 option used) otherwise, if numeric format result codes are used (V0
option used) it will not appear in the result codes.
<...> Name enclosed in angle brackets is a syntactical element. They do not appear in the
command line.
[...] Optional sub parameter of a command or an optional part of TA information response is
enclosed in square brackets. Brackets themselves do not appear in the command line.
When sub parameter is not given in AT commands which have a Read command, new
value equals to its previous value. In AT commands which do not store the values of
any of their sub parameters, and so have not a Read command, which are called action
type commands, action should be done on the basis of the recommended default setting
of the sub parameter.
1
The AT is an ATTENTION command and is used as a prefix to other parameters in a string. The AT command
combined with other parameters can be set up in the communications package or typed in manually as a
command line instruction.

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The syntax rules followed by Telit implementation of either Hayes AT commands and
GSM/WCDMA commands are very similar to those of standard basic and extended AT
commands. There are two types of extended command:
-Parameter type commands. This type of commands may be “set” (to store a value or
values for later use), “read” (to determine the current value or values stored), or “tested”
(to determine ranges of values supported). Each of them has a test command (trailing =?)
to give information about the type of its sub parameters; they also have a Read command
(trailing ?) to check the current values of sub parameters.
-Action type commands. This type of command may be “executed” or “tested”.
“executed“ to invoke a particular function of the equipment, which generally
involves more than the simple storage of a value for later use
“tested” to determine:
Whether or not the equipment implements the Action Command (in this case
issuing the correspondent Test command - trailing =? - returns the OK result
code), and, if sub parameters are associated with the action, the ranges of sub
parameters values that are supported.
Action commands don’t store the values of any of their possible sub parameters.
In case of Telit command, “read” action may be used for the specific purpose.
Moreover:
The response to the Test Command (trailing =?) may be changed in the future by
Telit to allow the description of new values/functionalities
If all the sub parameters of a parameter type command +CMD (or #CMD or
$CMD) are optional, issuing AT+CMD=<CR> (or AT#CMD=<CR> or
AT$CMD=<CR>) causes the OK result code to be returned and the previous values
of the omitted sub parameters to be retained.
A string, either enclosed between quotes or not, is considered to be a valid string type
parameter input. According to V25.ter space characters are ignored on the command line and
may be used freely for formatting purposes, unless they are embedded in numeric or quoted
string constants; therefore a string containing a space character has to be enclosed between
quotes to be considered a valid string type parameter (e.g. typing AT+COPS=1,0,”A1” is the
same as typing AT+COPS=1,0,A1; typing AT+COPS=1,0,”A BB” is different from typing
AT+COPS=1,0,A BB).
A small set of commands requires always writing the input string parameters within quotes:
this is explicitly reported in the specific descriptions.

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A command line is made up of three elements: the prefix, the body and the termination
character.
The command line prefix consists of the characters “AT” or “at”, or, to repeat the
execution of the previous command line, the characters “A/” or “a/”.
The termination character may be selected by a user option (parameter S3), the default
being <CR>.
The basic structures of the command line are:
ATCMD1<CR> where AT is the command line prefix, CMD1 is the body of a
basic command (nb: the name of the command never begins with the character
“+”) and <CR> is the command line terminator character
ATCMD2=10<CR> where 10 is a sub parameter
AT+CMD1;+CMD2=, ,10<CR> these are two examples of extended commands
(nb: the name of the command always begins with the character “+”
2
). They are
delimited with semicolon. In the second command the sub parameter is omitted.
+CMD1?<CR> This is a Read command for checking current sub parameter values
+CMD1=?<CR> This is a test command for checking possible sub parameter
values
These commands might be performed in a single command line as shown below:
ATCMD1 CMD2=10+CMD1;+CMD2=, ,10;+CMD1?;+CMD1=?<CR>
anyway it is always preferable to separate into different command lines the basic commands
and the extended commands; furthermore it is suggested to avoid placing several action
commands in the same command line, because if one of them fails, then an error message is
received but it is not possible to argue which one of them has failed the execution.
If command V1 is enabled (verbose responses codes) and all commands in a command line
has been performed successfully, result code <CR><LF>OK<CR><LF> is sent from the
TA to the TE, if sub parameter values of a command are not accepted by the TA or command
itself is invalid, or command cannot be performed for some reason, result code
<CR><LF>ERROR<CR><LF> is sent and no subsequent commands in the command line
are processed.
If command V0 is enabled (numeric responses codes), and all commands in a command line
has been performed successfully, result code 0<CR> is sent from the TA to the TE, if sub-
parameter values of a command are not accepted by the TA or command itself is invalid, or
2
The set of proprietary AT commands differentiates from the standard one because the name of
each of them begins with either “@”, “#”, “$” or “*”. Proprietary AT commands follow the same syntax
rules as extended commands

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command cannot be performed for some reason, result code 4<CR> and no subsequent
commands in the command line are processed.
In case of errors depending on ME operation, ERROR (or 4) response may be replaced by
+CME ERROR: <err> or +CMS ERROR: <err>.
NOTE: The command line buffer accepts a maximum of 80 characters. If this number is
exceeded none of the commands will be executed and TA returns ERROR.

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This is NOT a command, it is the error response to +Cxxx 3gpp TS 27.007 commands.
Syntax: +CME ERROR: <err>
Parameter: <err> - error code can be either numeric or verbose (see +CMEE).The
possible values of <err> are reported in the table:
Numeric Format
Verbose Format
General errors:
0
phone failure
1
No connection to phone
2
phone-adaptor link reserved
3
operation not allowed
4
operation not supported
5
PH-SIM PIN required
10
SIM not inserted
11
SIM PIN required
12
SIM PUK required
13
SIM failure
14
SIM busy
15
SIM wrong
16
incorrect password
17
SIM PIN2 required
18
SIM PUK2 required
20
memory full
21
invalid index
22
not found
23
memory failure
24
text string too long
25
invalid characters in text string
26
dial string too long
27
invalid characters in dial string
30
no network service
31
network time-out
32
network not allowed - emergency calls only
40
network personalization PIN required
41
network personalization PUK required
42
network subset personalization PIN required
43
network subset personalization PUK required
44
service provider personalization PIN required
45
service provider personalization PUK required
46
corporate personalization PIN required
47
corporate personalization PUK required
General purpose error:
100
unknown
770
SIM invalid
EPS related errors to a failure to perform an Attach:
103
Illegal MS (#3)*
106
Illegal ME (#6)*
107
EPS service not allowed (#7)*
111
PLMN not allowed (#11)*
112
Tracking area not allowed (#12)*

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Numeric Format
Verbose Format
113
Roaming not allowed in this tracking area (#13)*
EPS related errors to a failure to Activate a Context and others:
132
service option not supported (#32)*
133
requested service option not subscribed (#33)*
134
service option temporarily out of order (#34)*
148
unspecified EPS error
149
PDP authentication failure
150
invalid mobile class
Easy GPRS® related errors
550
generic undocumented error
551
wrong state
552
wrong mode
553
context already activated
554
stack already active
555
activation failed
556
context not opened
557
cannot setup socket
558
cannot resolve DN
559
timeout in opening socket
560
cannot open socket
561
remote disconnected or time-out
562
connection failed
563
tx error
564
already listening
Network survey errors
657
Network survey error (No Carrier)*
658
Network survey error (Busy)*
659
Network survey error (Wrong request)*
660
Network survey error (Aborted)*
Supplementary service related error
257
network rejected request
258
retry operation
259
invalid deflected to number
260
deflected to own number
261
unknown subscriber
262
service not available
263
unknown class specified
264
unknown network message
AT+COPS test command related error
680
LU processing
681
Network search aborted
682
PTM mode
*(Values in parentheses are 3gpp TS 24.008 cause codes)

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This is NOT a command; it is the error response to +Cxxx 3gpp TS 27.005
commands
Syntax: +CMS ERROR: <err>
Parameter: <err> - numeric error code. The <err> values are reported in the table:
Numeric Format
Meaning
0...127
3gpp TS 24.011 Annex E-2 values
128...255
3gpp TS 23.040 sub clause 9.2.3.22 values
300
ME failure
301
SMS service of ME reserved
302
operation not allowed
303
operation not supported
304
invalid PDU mode parameter
305
invalid text mode parameter
310
SIM not inserted
311
SIM PIN required
312
PH-SIM PIN required
313
SIM failure
314
SIM busy
315
SIM wrong
316
SIM PUK required
317
SIM PIN2 required
318
SIM PUK2 required
320
memory failure
321
invalid memory index
322
memory full
330
SMSC address unknown
331
no network service
332
network time-out
340
no +CNMA acknowledgement expected
500
unknown error

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The TA response, in case of verbose response format enabled, for the previous examples
command line could be as shown below:
Information response to +CMD1?
<CR><LF>+CMD1:2,1,10<CR><LF>
Information response to +CMD1=?
<CR><LF>+CMD1(0-2),(0,1),(0-15)<CR><LF>
Final result code <CR><LF>OK<CR><LF>
Moreover, there are other two types of result codes:
result codes that inform about progress of TA operation (e.g. connection establishment
CONNECT)
Result codes that indicate occurrence of an event not directly associated with issuance of a
command from TE (e.g. ring indication RING).
Here the basic result codes according to ITU-T V25Ter recommendation
Result Codes
Numeric form
Verbose form
0
OK
1
CONNECT
2
RING
3
NO CARRIER
4
ERROR
6
NO DIALTONE
7
BUSY
8
NO ANSWER