SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
NOTICES LIST
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or describe copyrighted Telit material, such as computer programs stored in semiconductor
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COMPUTER SOFTWARE COPYRIGHTS
The Telit and 3rd Party supplied So ftware (SW) products described in this i nstruction manual may
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any copyrighted Telit or other 3rd Party supplied SW computer programs contained in the Telit
products described in this instruction manual may not be copied (reverse engineered) or
80591ST10886A Rev.2Page 2 of 200 2018-07-02
reproduced in any manner without the express written permission of Telit or the 3rd Party SW
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applications of Telit or other 3rd Party supplied SW, except for the normal non-exclusive, royalty
free license to use that arises by operation of law in the sale of a product.
80591ST10886A Rev.2Page 3 of 200 2018-07-02
USAGE AND DISCLOSURE RESTRICTIONS
I. License Agreements
The software described in this document is the property of Telit and its licensors. It is furnished by
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III. High Risk Materials
Components, units, or third-party products used in the product described herein are NOT faulttolerant 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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80591ST10886A Rev.2Page 4 of 200 2018-07-02
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TO ANY SEPARATE FILES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
80591ST10886A Rev.2Page 5 of 200 2018-07-02
SW Versions
Modules
APPLICABILITY TABLE
PRODUCTS
LN940A11 SERIES T77W676.0.0.3.7
LN940A9 SERIES T77W676.0.0.3.9
LTE
80591ST10886A Rev.2Page 6 of 200 2018-07-02
CONTENTS
NOTICES LIST ................................................................................................ 2
2. GLOSSARY AND ACRONYMS ................................................ 197
3. DOCUMENT HISTORY ............................................................. 199
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1. INTRODUCTION
Scope
This document covers the more significant standard and proprietary AT commands provided by
Telit's modules. Several module features are described and for each one of them the related AT
commands are explained through examples. This document is not an exhaustive description of
the AT commands implemented on the Telit's modules series, its target is only to give you an
entry point to the AT commands world.
Audience
The present User Guide is addressed to users that need to learn and use quickly standard and
proprietary AT commands. The reader can learn the use of the AT commands through simple
examples shown in the document, and then deepen the interested AT commands reading the
documents [1]/[17] in accordance with the used module.
Contact Information, Support
For general contact, technical support services, technical questions and report documentation
errors contact Telit Technical Support at:
• TS-EMEA@telit.com
• TS-AMERICAS@telit.com
• TS-APAC@telit.com
• TS-SRD@telit.com (for Short Range Devices)
Alternatively, use:
http://www.telit.com/support
For detailed information about where you can buy the Telit modules or for recommendations on
accessories and components visit:
http://www.telit.com
Our aim is to make th is guide as helpful as possible. Keep us informed of your comments and
suggestions for improvements. Telit appreciates feedback from the users of our information.
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AT command type
Syntax
Function
Test command
AT+CXXX=?
The mobile equipment returns the list of parameter sand
Read command
AT+CXXX?
This command returns the currently set value of the
Write command
AT+CXXX=<…>
This command sets user-definable parameter values.
Exec (ution)
AT+CXXX
The execution command reads non-variable parameters
2.
SYNTAX
1.1. AT Command Syntax
The “AT” or “at” prefix must be set at the beginning of each command line. To terminate command line
enter
<CR>.Commands are usually followed by are sponse that includes “<CR> <LF> <response> <CR>
<LF>”. Throughout this document, only there sponses are presented <CR> <LF> are omitted in
tentionally.
Table 1.4: Types of AT command sand responses
value ranges set with the corresponding Write command or
by internal processes.
parameter or parameters.
command
deter-mined by internal processes in the UE.
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Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
3.
BASIC COMMANDS
3.1.
Repeat Previous AT command line.
In general, after beginning a command line with character “a” or “A” a second character “t”, “T” or “/” has to
follow. “/”acts as line terminate character. In case of using a wrong second character, it is necessary to start
again with character “a” or “A”
Repeat Previous Command Line: A/
Syntax
Exec command A/ OK
Parameter Description
NULL
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Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
4.
ITU-T V.25TER DTE-DCE INTERFACE
COMMAND
4.1.
ATS3 determines the character recognized by the device to terminate an incoming command line. It is also
generated for result codes and information text, along with character value set via ATS4.
Syntax
ATS3 Command Line Termination
Read Command ATS3? <n>
OK
Write Command
ATS3=<n> OK -
-
Parameter Description
<n> 0~127 Default value is 13 (Corresponding ASCII character CR
carriage return )
Notice: if change this value, it possible to affect the
execution of the AT command.
Example
ATS3=32
OK
ATS32?
32
OK
In this point, the AT command line terminator has become a
space instead of the previous carriage return
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Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
4.2.
ATS4 Response Formatting
ATS4 determines the character generated by the device for result code and information text, along with the
command line termination character set via ATS3.
Syntax
Read Command ATS4? <n>
Write Command
ATS4=<n> OK -
Parameter Description
OK
-
<n> 0~127 Default value is 10 (Corresponding ASCII character LF
carriage return )
Response formatting character. It is not recommended
to change this value.
4.3.
ATS5 Command Line Editing
ATS5 determines the character value used by the device to delete the immediately preceding character from the
AT command line (i.e. equates backspace key).
Syntax
Read Command ATS5? <n>
OK
-
Write Command
Parameter Description
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ATS5=<n> OK -
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
<n> 0~127 Default value is 8.
Command line editing character.
It is not recommended to change this value.
4.4.
ATE AT Command Echo
ATE controls if the device echoes characters received from TE during AT command state..
Syntax
Exec Command ATE[<value>] OK -
Parameter Description
<value> 0 Echo mode off
1 Echo mode on
4.5.
ATQ Result Code Presentation Mode
ATQ controls if the device transm its an y result cod e to the TE. Other inf ormation text transmitted as respons e is
not affected.
Syntax
Exec Command ATQ[n] OK -
Parameter Description
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UE transmits result code. It is not recommended to change this
value.
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
<n> [0]
1
Result codes are suppressed and not transmitted.
4.6.
ATV Result Code Format Mode
This command determines the contents of header and trailer transmitted with AT command result codes and
information responses
Syntax
Exec Command ATV[<value>] OK -
Parameter Description
<value> 0 Information response: <text><CR><LF>
Short result code format: <numeric code><CR>
1
Information response: <CR><LF><text><CR><LF> Long
result code format: <CR><LF><verbose code><CR><LF>
4.7.
ATX determines whether or not the device transmits particular result codes to the TE.
ATX also controls whether or not the UE verifies the presence of a dial tone when it begins dialing, and if
engagedtone (busy signal) detection is enabled.
The CONNECT result code indicates that the UE has changed from command state to online data state.
ATX Connect Result Code Format
Syntax
Exec Command ATX[<value>] OK -
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parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Parameter Description
<value> [0]
1 CONNECT <text> result code returned. Dial tone and busy
2
3 CONNECT <text> result code returned. Dial tone detection is
4 CONNECT <text> result code returned. Dial tone and busy
CONNECT result code returned. Dial tone and busy detection
are disabled.
detection are disabled.
CONNECT <text> result code returned. Dial tone detection is
enabled, busy detection is disabled.
disabled, busy detection is enabled.
detection are both enabled.
4.8.
AT&W stores the current AT command settings to a user defined profile in non-volatile memory of device. The
AT command settings will automatically be restored from the user defined profile during power-up or if ATZ is
AT&W Store AT Command Setting to User Defined Profile
used. AT&F restores AT command factory default settings. Hence, until first use of AT&W, ATZ works as
AT&F.
Syntax
Exec Command AT&W[<value>] OK -
Parameter Description
<value> [0] User Profile Number
4.9.
Controls the display of data rate to be either serial rate or wireless connection speed.
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AT&E Store AT Command Setting to User Defi ned P rof il e
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return
Result
Instruction
parameter
Value
Instruction
Syntax
Exec Command AT&E[<value>] OK -
Parameter Description
<value> [0] Serial/DTE rate
1 wireless connection speed
4.10.
This set command defines the asynchronous character framing to be used whenautobauding is disabled
AT+ICF DTE-Modem Character Framing
Syntax
Test Command AT+ICF=? +ICF: (3),(0-3)
OK
Read Command AT+ICF? +ICF:
<value>,<parity>
OK
Write Command AT+ICF=[<format>,
[<parity>]]
OK -
-
-
Parameter Description
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the number of bits in the data bits, the presence of a parity bit, and the number of
etermines how the parity bit is generated and checked, if present; this sub parameter has no
Type
Command
Possible Return
Result
Instruction
parameter
Value
Instruction
<value>
<parity> D
Determines
stop bits in the start-stop frame.
[3]
meaning.
0 Odd (not supported)
1
2
[3]
8 data bit, 1 stop bit
Even (not supported)
Mark
None
4.11.
This set command selects the flow control behavior of the serial port in both directions: from DTE to modem
(<by_ta> option) and from modem to DTE (<by_te>).
AT+IFC DTE-Modem Local Flow Cont rol
Syntax
Test Command AT+IFC=? +IFC: =(<by_te>list),
(<by_ta>list)
OK
Read Command AT+IFC?
Write Command AT+IFC=<by_te>, <by_ta> OK -
+IFC: =<by_te>,
<by_ta>
OK
Parameter Description
-
-
< by_te >
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Flow control option for the data received by DTE
0 flow control None
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
1
[2]
3
< by_ta > Flow control option for the data sent by modem
0
1
[2]
XON/XOFF filtered
C105 (RTS) (factory default)
XON/XOFF not filtered
flow control None
XON/XOFF
C106 (CTS) (factory default)
4.12.
First ATZ resets the AT comm and settings to their factory default val ues, similar to AT&F. Afterwar ds the AT
command settings are r es t or ed f rom a user defined prof ile i n n on-volatile memory, if one was stored w ith AT&W
before. Any addition al AT c omm and on the sam e comm and line ma y be ignored. A dela y of 300 m s is required
ATZ Restore AT Command Settings from User Defined Profile
before next AT command is sent.
However, ATZ does not change the current bit rate of asynchronous serial interface (UART).
Syntax
Exec Command ATZ[<value>] OK -
Parameter Description
<value> [0] User Profile Number
4.13.
AT&F resets AT command settings to their factory default values.
However, the command does not change the current bit rate of asynchronous serial interface (UART).
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AT&F Reset AT Command Settings to Factory Default Values
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
Syntax
Exec Command AT&F[<value>] OK -
Parameter Description
<value> [0] Reset parameters to their factory default values
4.14.
ATI Display Product Identification Information
The ATI execute command delivers a product information text.
The AT+GSN returns the serial number. Please enter an IMEI in NV550.
Syntax
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AT+GSN Display Serial Number
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Exec Command AT+GSN <sn>
OK
Test Command AT+GSN=? OK -
-
Parameter Description
<sn> The serial number of device.
4.19.
The AT+GCAP returns the Capabilities List.
AT+GCAP Display Product Capabilities List
Syntax
Exec Command AT+GCAP +GCAP: <name>
OK
Test Command AT+GCAP=? OK -
-
Parameter Description
<name> Additional function list, such as +CGSM
Example:
AT+GCAP
+GCAP: +CGSM
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Type
Command
Possible Return Result
Instruction
parameter
Value
Instruction
Type
Command
Possible Return Result
Instruction
OK
4.20.
The command sets the ASCII character to be used as escape character.
ATS2 Escape Character
Syntax
Read Command ATS2? <value>
OK
Write Command ATS2=[value] OK -
Parameter Description
<value> 1-255 43(+) is default value
-
4.21.
This set command sets the amount of time, in seconds, that the device shall allow between either answering a
call (automatically or by A command) or completion of signaling of call addressing information to network
(dialing), and establishment of a connection with the remote device.
ATS7 Connection Completion Ti m e-Out
Syntax
Read Command ATS7? <value>
OK
Write Command ATS7=[value] OK -
Parameter Description
-
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