AT Commands
AT commands are a group of commands that can be sent by a terminal or host computer to control the ISU (Iridium Subscriber Unit ) in Command mode.
When the ISU is in command mode (or off-line mode), AT commands can be entered to control the phone.
When in data (also called on-line) mode, the ISU is connected to a remote system and any characters sent it will be transmitted to the remote system. It is possible to enter the command mode without terminating call by using the +++ escape sequence detailed below.
An AT command is a string of characters sent by the DTE (Data Terminal Equipment ) to the ISU while the ISU is in command mode.
To send a command mode to a Equipment we need a software which can communicate with the Equipment and know how to interpret this commands .
A software which can be used to send AT commands is Hyper Terminal and you can find it in Start ( menu ) -> Programs -> Communications -> Hyper Terminal .
First step is to configure the Hyper Terminal port for the communication you need .
After the configuration is done you can AT command from Hyper Terminal to DTE by writing commands in the Hyper Terminal window .
After the command was send we receive some response messages like OK or other messages .
Basic AT Commands
List of the basic AT commands with description .
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A/ +++AT ATA ATD ATD><MEM><N> ATD><N> ATDL ATE ATH ATI ATL ATM ATO ATP ATQ ATS0 ATS3 ATS4 ATS5 ATS6 ATS7 ATS8 ATS10 ATT ATV ATX ATZ AT&C AT&D AT&F AT&V AT&W AT+DR AT+DS AT+GCAP AT+GMI AT+GMM AT+GMR AT+GOI AT+GSN AT+ICF AT+IFC AT+ILRR AT+IPR AT+CBST AT+CGMI AT+CGMM AT+CGMR
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Re-issues last AT command given ESC from Data mode to command mode Answer incoming call Mobile Originated call to dialable number Originate call to phone number in memory <MEM> Originate call to phone number in current memory Redial last telephone number used Set command echo mode Disconnect existing connection Display product identification information Set monitor speaker loudness Set monitor speaker mode Switch from command mode to data mode Select pulse dialling Set Result code presentation mode Set number of rings before automatically answering the call Set command line termination character Set response formatting character Set command line editing character Set pause before blind dialling Set number of seconds to wait for connection completion Set number of seconds to wait when comma dial modifier used Set disconnect delay after indicating the absence of data carrier Select tone dialling Set result code format mode Set connect result code format and call monitoring Set all current parameters to user defined profile Set DCD function mode Set DTR function mode Set all current parameters to manufacturer defaults Display current configuration Store current parameter to user defined profile V.42bis data compression reporting control V.42bis data compression control Request complete TA capabilities list Request manufacturer identification Request TA model identification Request TA revision identification Request global object identification Request TA serial number identification (IMEI) Set TE-TA control character framing Set TE-TA local data flow control Set TE-TA local rate reporting mode Set fixed local rate SELECT BEARER SERVICE TYPE REQUEST MANUFACTURER IDENTIFICATION REQUEST MODEL IDENTIFICATION REQUEST REVISION IDENTIFICATION
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Some AT commands for performing SMS and CBS related operations for both Text and PDU modes
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AT+CMGD AT+CMGF AT+CMGL AT+CMGR AT+CMGS AT+CMGW AT+CMSS AT+CMGC AT+CNMI AT+CPMS AT+CRES AT+CSAS AT+CSCA AT+CSCB AT+CSDH AT+CSMP AT+CSMS |
DELETE SMS MESSAGE SELECT SMS MESSAGE FORMAT LIST SMS MESSAGES FROM PREFERRED STORE READ SMS MESSAGE SEND SMS MESSAGE WRITE SMS MESSAGE TO MEMORY SEND SMS MESSAGE FROM STORAGE SEND SMS COMMAND NEW SMS MESSAGE INDICATIONS PREFERRED SMS MESSAGE STORAGE RESTORE SMS SETTINGS SAVE SMS SETTINGS SMS SERVICE CENTER ADDRESS SELECT CELL BROADCAST SMS MESSAGES SHOW SMS TEXT MODE PARAMETERS SET SMS TEXT MODE PARAMETERS SELECT MESSAGE SERVICE |
Not all commands work for all type of modems , if the command not supported by the device you receive a message like “ Command not supported “ or an Error message .
Using the AT Commands you can enter in programming mode that allow you to modify the modem settings .
If you want to see the list of the command supported by modem you can type the AT+CLAC command which returns a list with all commands supported by device .
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