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Communication BoardsWireless Boards

Basic AT Commands for SIM900A GSM/GPRS Module

basic-at-commands-for-sim900a-gsm-gprs-module

TO CHECK THE MODEM:

AT

OK

TO CHANGE SMS SENDING MODE:

AT+CMGF=1

OK

TO SEND NEW SMS:

AT+CMGS=”MOBILE NO.”

<MESSAGE

{CTRL+Z}

PREFERRED SMS MESSAGE STORAGE:

AT+CPMS=?

+CPMS: (“SM”),(“SM”),(“SM”)

OK

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=?

OK

AT+COPS?

+COPS: 0,0,”AirTel”

OK

AT+CRC SET CELLULAR RESULT CODES FOR INCOMING CALL INDICATION:

AT+CRC=?

+CRC: (0-1)

OK

AT+CRC?

+CRC: 0

OK

AT+CRC=1

OK

+CRING: VOICE

READ OPERATOR NAMES.

AT+COPN=?

OK

AT+COPN

+COPN: “472001”,”DHIMOBILE”

+COPN: “60500

+COPN: “502012”,”maxis mobile”

+COPN:

+COPN: “502013”,”TMTOUCH”

+COPN

+COPN: “502016”,”DiGi”

+COPN: “502017”,”TIMECel””

+COPN: “502019”,”CELCOM GSM”

GPRS COMMANDS:

Command Description

AT+CGATT                   ATTACH/DETACH FROM GPRS SERVICE

AT+CGDCONT             DEFINE PDP CONTEXT

AT+CGQMIN               QUALITY OF SERVICE PROFILE (MINIMUM ACCEPTABLE)

AT+CGQREQ               QUALITY OF SERVICE PROFILE (REQUESTED)

AT+CGACT                   PDP CONTEXT ACTIVATE OR DEACTIVATE

AT+CGDATA                ENTER DATA STATE

AT+CGPADDR              SHOW PDP ADDRESS

AT+CGCLASS               GPRS MOBILE STATION CLASS

AT+CGEREP                 CONTROL UNSOLICITED GPRS EVENT REPORTING

AT+CGREG                  NETWORK REGISTRATION STATUS

AT+CGSMS                  SELECT SERVICE FOR MO SMS MESSAGES

AT+CGCOUNT                         GPRS PACKET COUNTERS

https://www.pantechsolutions.net/wireless-boards/sim900a-gsm-modem

Tags : Basic AT Commands for SIM900A GSM/GPRS Modulesim900a AT commandssim900b at commands
Pantech

The author Pantech

  • Azmin

    Hello,

    Need some help. Just bought an GSM Modem with SIM900A. Tried to connect the modem to the GPRS but ended up with fail. I’ve been already followed the GPRS command that been shown as above. Please someone explain to me why the GSM modem keep showing ERROR while i execute those GPRS command above.

  • Ali Attaran

    Make sure, the connections are correct, like 3VR on GSM to tx0 on TTL to USB converter, 3VT on GSM to rx0 on TTL to USB converter and GND to GND. power supply too, 5v or whatever your modem needs