Research SIM 900A - Basic AT Commands for GSM and GPRS Testing; GSM AT Commands

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GSM GPRS SIM900A MODEM

REV1.0

Basic AT Commands for Testing

GSM AT Commands:

 TO CHECK THE MODEM:

AT ↲

 TO CHANGE SMS SENDING MODE:

AT+CMGF=1 ↲

 TO SEND NEW SMS:

AT+CMGS=”MOBILE NO.” ↲

<MESSAGE

{CTRL+Z}

 TO RECEIVE SMS

AT+CMGD=1 ↲ {to delete the message in buffer}

AT+CMGR=1 ↲ {to receive first message AT+CMGR=1}

{to receive second message AT+CMGR=2 and so on}

+CMGL: 1,"REC READ","+85291234567",,"07/05/01,08:00:15+32",145,37

<MESSAGE

 PREFERRED SMS MESSAGE STORAGE:

AT+CPMS=? ↲

+CPMS: (“SM”),(“SM”),(“SM”)

AT+CPMS? ↲

+CPMS: “SM”,19,30,”SM”,19,30,”SM”,19,30

 TO MAKE A VOICE CALL:

ATD9876543210; ↲

 TO REDIAL LAST NO:

ATDL ↲

 TO RECEIVE INCOMING CALL:

ATA ↲

 TO HANGUP OR DISCONNECT A CALL:

ATH ↲

 TO SET A PARTICULAR BAUDRATE:

AT+IPR=? ↲ {To view the baud rate values}

AT+IPR=0 ↲ {To set the modem to autobauding mode}

 OPERATOR SELECTION:

AT+COPS=? ↲

AT+COPS? ↲

+COPS: 0,0,”AirTel”