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AT Commands According to V.25TER 

 

Command Description
A/ Re-issues the last command given
ATD Mobile originated call to dial a number
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
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 dialing
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
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
AT&F Factory defined configuration
AT&V Display current configuration
AT&E Set CONNECT Result Code Format About Speed
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

 

 

 

 

A/     Re-issues the Last Command Given

 

E) A/ Re-issues the previous Command

 

 

 

 

ATD     Mobile Originated Call to Dial A Number

  

E) ATD<n>[<mgsm]

This command can be used to set up outgoing data calls.

It also serves to control supplementary services.

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: <err>

 

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<text> TA switches to data mode.

Note: <text> output only if ATX<value> parameter setting with the <value> >0

 

When TA returns to command mode after call release

OK

Parameters

<n>      

String of dialing digits and optionally V.25ter modifiers dialing digits:0-9, * , #, +, A, B, C

Following V.25ter modifiers are ignored: ,(comma), T, P, !, W, @

 

Emergency call:

<n>     Standardized emergency number 112 (no SIM needed)

<mgsm>     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

Parameter Saving Mode NO_SAVE
Max Response Time Timeout set with ATS7 (data call)

 

 

 

 

ATE     Set Command Echo Mode

 

E) ATE<value>

This setting determines whether or not the TA echoes characters received from TE during

Command state.

OK

Parameters

<value>     

0    Echo mode off

1    Echo mode on

Parameter Saving Mode NO_SAVE

 

 

 

 

ATH     Disconnect Existing Connection

  

E) ATH

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 Mode NO_SAVE
Max Response Time 20s

 

 

 

 

ATI     Display Product Identification Information

 

E) ATI

TA issues product information text

 

Example:

SIM7000 R1351

 

OK

Parameter Saving Mode NO_SAVE

 

 

 

 

ATL     Set Monitor Speaker Loudness

 

E) ATL<value> OK

Parameters

<value>      

0..3     Volume

Parameter Saving Mode NO_SAVE

Reference

V.25ter

Note

No effect in GSM

 

 

 

 

ATM     Set Monitor Speaker Mode

 

E) ATM<value> OK

Parameters

<value>      

0..2     Mode

Parameter Saving Mode NO_SAVE

Reference

V.25ter

Note

No effect in GSM

 

 

 

 

+++     Switch From Data Mode Or PPP Online Mode To Command Mode

  

E) +++

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

 

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 Mode NO_SAVE

Reference

V.25ter

Note

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

 

 

 

 

ATO     Switch From Command Mode To Data Mode

 

E) ATO[n]

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 <text>

Note: <text> only if parameter setting ATX>0

Parameter

<n>      

0     Switch from command mode to data mode.

Parameter Saving Mode NO_SAVE

 

 

 

 

ATQ     Set Result Code Presentation Mode

 

E) ATQ<n>

This parameter setting determines whether or not the TA transmits any result code to the TE.

Information text transmitted in response is not affected by this setting.

If <n>=0:

OK

If <n>=1:

(none)

Parameters

<n>      

0     TA transmits result code

1     Result codes are suppressed and not transmitted

Parameter Saving Mode NO_SAVE

 

 

 

 

ATS0     Set Number Of Rings Before Automatically Answering The Call

 

R) ATS0?

<n>

 

OK

Parameters

See Write Command

W) ATS0=<n>

This parameter setting determines the number of rings before auto-answer.

OK

or

ERROR

Parameters

<n>        

0     Automatic answering is disable.

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

Reference

V.25ter

Note

If <n> 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.

 

 

 

 

ATS3     Set Command Line Termination Character

  

R) ATS3?

<n>

OK

Parameters

See Write Command

W) ATS3=<n>

This parameter setting determines the character recognized by TA to terminate an incoming command line.

The TA also returns this character in output.

OK

or

ERROR

Parameters

<n>      

13     Command line termination character

Reference

V.25ter

Note

Default 13 = CR. It only supports default value.

 

 

 

 

ATS4     Set Response Formatting Chracter

 

R) ATS4?

<n>

 

OK

Parameters

See Write Command

W) ATS4=<n>

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

OK

or

ERROR

Parameters

<n>      

10     Response formatting character

Reference

V.25ter

Note

Default 10 = LF.

It only supports default value.

 

 

 

 

ATS5     Set Command Line Editing Chracter

 

R) ATS5?

<n>

 

OK

Parameters

See Write Command

W) ATS5=<n>

This parameter setting determines the character recognized by TA as a request to delete from the

command line the immediately preceding character.

OK

or

ERROR

Parameters

<n>      

0-8-127     Response formatting character

Reference

V.25ter

Note

Default 8 = Backspace.

 

 

 

 

ATS6     Pause Before Blind Dialing

 

R) ATS6?

<n>

 

OK

W) ATS6=<n>

OK

or

ERROR

Parameters

<n>     

0-2-999    Time

Reference

V.25ter

Note

No effect in GSM

 

 

 

 

ATS7     Set Number Of Seconds To Wait For Connection Completion

 

R) ATS7?

<n>

 

OK

Parameters

See Write Command

W) ATS7=<n>

This parameter setting determines the amount of time to wait for the connection completion in case of

answering or originating a call.

OK

or

ERROR

Parameters

<n>      

0-255     Number of seconds to wait for connection completion

Reference

V.25ter

Note

If called party has specified a high value for ATS0=<n>, 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.

 

 

 

 

ATS8     Set Number Of Seconds To Wait For Comma Dial Modifier Encountered In Dial String Of D Command

 

R) ATS8?

<n>

 

OK

Parameters

See Write Command

W) ATS8=<n>

OK

or

ERROR

Parameters

<n>     

0-2-255 The value of this register determines how long the modem should pause when it sees a

comma in the dialing string.

Reference

V.25ter

Note

No effect in GSM

 

 

 

 

ATS10     Set Disconnect Delay After Indicating The Absence Of Data Carrier

 

R) ATS10?

<n>

 

OK

Parameters

See Write Command

W) ATS10=<n>

This parameter setting determines the amount of time that the TA will remain connected in absence of

data carrier.

If the data carrier is once more detected before disconnecting, the TA remains connected.

OK

or

ERROR

Parameters

<n>     

1-14-255     Number of tenths seconds of delay

 

 

 

 

ATV     TA Response Format

 

E) ATV<value>

This parameter setting determines the contents of the header and trailer transmitted with result codes and information responses.

When <value>=0

0

When <value>=1

OK

Parameters

<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> The result codes, their numeric

equivalents and brief descriptions of the use of each are listed in the following table.

 

 

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 <text>

Manufacturer-

specific

Same as CONNECT, but includes manufacturer-specific text that may specify DTE

speed, line speed, error control, data compression, or other status

 

 

 

 

ATX     Set CONNECT Result Code Format And Monitor Call Progress

  

E) ATX<value>

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

<value>      

0     CONNECT result code only returned, dial tone and busy detection are both disabled.

1     CONNECT<text> result code only returned, dial tone and busy detection are both disabled.

2     CONNECT<text> result code returned, dial tone detection is enabled,

busy detection is disabled.

3     CONNECT<text> result code returned, dial tone detection is disabled,

busy detection is enabled.

4     CONNECT<text> result code returned, dial tone and busy detection are both enabled.

 

 

 

 

AT&C     Set DCD Function Mode

 

E) AT&C<value>

This parameter determines how the state of circuit 109 (DCD) relates to the detection of received line

signal from the distant end.

OK

 

ERROR

Parameters

<value>      

0     DCD line is always ON

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

 

 

 

 

AT&D     Set DTR Function Mode

 

E) AT&D[<value>]

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

or

ERROR

Parameters

<value>     

0     TA ignores status on DTR.

1     ON->OFF on DTR: Change to Command mode with remaining the connected call.

2     ON->OFF on DTR: Disconnect call, change to Command

mode. During state DTR = OFF is auto-answer off.

 

 

 

 

AT&E     Set CONNECT Result Code Format About Speed

 

E) AT&E[<value>]

This parameter setting determines to report Serial connection rate or Wireless connection speed.

It is valid only ATX above 0.

OK

or

ERROR

Parameters

<value>

0       Wireless connection speed in integer format.

1       Serial connection rate in integer format. Such as: “115200”

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GCAP     Request Complete TA Capabilities List

  

E) AT+GCAP

TA reports a list of additional capabilities.

+GCAP: list of supported <name>s

 

OK

Parameters

<name>      

+CGSM    GSM function is supported

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GMI     Request Manufacturer Identification

 

T) AT+GMI=?

OK

E) AT+GMI

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

SIMCOM_Ltd

 

OK

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GMM     Request TA Model Identification

 

T) AT+GMM=?

OK

E) AT+GMM

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

model of device.

<model>

 

OK

Parameters

<model>        

Product model identification text

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GMR     Request TA Revision Identification Of Software Release

 

T) AT+GMR=?

OK

E) AT+GMR

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

software release.

Revision: <revision>

OK

Parameters

<revision>

Revision of software release

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GOI     Request Global Object Identification

  

T) AT+GOI=?

OK

E) AT+GOI

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.

<Object Id>

 

OK

Parameters

<Object Id>

Identifier of device type

see X.208, 209 for the format of <Object Id>

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+GSN     Request TA Serial Number Identification(IMEI)

 

T) AT+GSN=?

OK

E) AT+GSN

TA reports the IMEI (international mobile equipment identifier) number in information text which permit

the user to identify the individual ME device.

<sn>

 

OK

Parameters

<sn>         

IMEI of the telephone(International Mobile station Equipment Identity)

Parameter Saving Mode NO_SAVE

Reference

V.25ter

Note

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

 

 

 

 

AT+ICF     Set TE-TA Control Character Framing

 

T) AT+ICF=?

+ICF: (list of supported <format>s),(list of supported <parity>s)

 

OK

Parameters

See Write Command

R) AT+ICF?

+ICF: <format>,<parity>

 

OK

Parameters

See Write Command

W) AT+ICF=<format>[,<parity>]

This parameter setting determines the serial interface character framing format and parity

received by TA from TE.

 

OK

Parameters

<format>      

1     8 data 0 parity 2 stop

2     8 data 1 parity 1 stop

3     8 data 0 parity 1 stop

4     7 data 0 parity 2 stop

5     7 data 1 parity 1 stop

6     7 data 0 parity 1 stop

<parity>       

0     odd

1     even

3     space (0)

Reference

V.25ter

Note

The Command is applied for Command state;

In <format> parameter, “0 parity” means no parity;

The <parity> field is ignored if the <format> field specifies no parity and string

“+ICF:<format>,255″ will be response to “AT+ICF?” Command.

 

 

 

 

AT+IFC     Set TE-TA Local Data Flow Control

 

T) AT+IFC=?

+IFC: (list of supported <dce_by_dte>s),(list of supported <dte_by_dce>s)

 

OK

Parameters

See Write Command

R) AT+IFC?

+IFC: <dce_by_dte>,<dte_by_dce>

 

OK

Parameters

See Write Command

W) AT+IFC=<dce_by_dte> [,<dte_by_dce>]

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

OK

Parameters

<dce_by_dte>        Specifies the method will be used by TE at receive of data from TA

0       No flow control

1       Software flow control

2       Hardware flow control

<dte_by_dce>    Specifies the method will be used by TA at receive of data from TE

0       No flow control

1       Software flow control

2       Hardware flow control

 

 

 

 

AT+IPR     Set TE-TA Fixed Local Rate

 

T) AT+IPR=?

+IPR: (list of supported auto detectable <rate>s),(list of supported fixed-only <rate>s)

 

OK

Parameters

See Write Command

R) AT+IPR?

+IPR: <rate>

 

OK

Parameters

See Write Command

 

 

 

 

W) AT+IPR=<rate>

This parameter setting determines the data rate of the TA on the serial interface.

The rate of Command takes effect following the issuance of any result code associated with the

current Command line.

OK

Parameters

<rate>       Baud rate per second

0

300

600

1200

2400

4800

9600

19200

38400

57600

115200

230400

921600

2000000

2900000

3000000

3200000

3686400

4000000

Parameter Saving Mode AUTO_SAVE

 

 

 

 

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