INTERFACING 8051 with gsm module.

[Naresh10]

Pls anyone can u tell me wat to do for interfacing 8051 with GSM module, i hav bought AT89S51, i am jus beginner and need to buy GSM module. What are the steps i need to follow for interfacing ?? Anyone pls help me??

 

[aameer]

First check whether it is a Sim300/Wave form..
i have worked with sim 300.Check whether it is a TTL output or inbuilt max232 output.if it is a TTL output then connect the RX and TX pin to MAX 232 board and connect a DB9 connector to your PC..Insert SIM in GSM Module & Switch on.
Open Hyperterminal and set Baud Rate of 9600.
Type AT .....Press Enter
If you get OK then it is working
Later Type AT+CMGF=1 ......Press enter
You will get OK
To Read a message AT+CMGR=1 ......Press enter........this will read first message if u want another then Type a number

To Send a message AT+CMGS="9966333220" .......... ......Press enter (You type to which mobile number the message has to send)
you will get >
Then Type the message you want to send..
Then Press Ctrl+Z...
After sending it will give OK.

then Disconnect and connect the RX ant TX pin of GSM module to Pin 8 and 9
write the program as i described the above steps.

---------- Post added at 13:45 ---------- Previous post was at 12:16 ----------

First check whether it is a Sim300/Wave form..
i have worked with sim 300.Check whether it is a TTL output or inbuilt max232 output.if it is a TTL output then connect the RX and TX pin to MAX 232 board and connect a DB9 connector to your PC..Insert SIM in GSM Module & Switch on.
Open Hyperterminal and set Baud Rate of 9600.
Type AT .....Press Enter
If you get OK then it is working
Later Type AT+CMGF=1 ......Press enter
You will get OK
To Read a message AT+CMGR=1 ......Press enter........this will read first message if u want another then Type a number

To Send a message AT+CMGS="9966333220" .......... ......Press enter (You type to which mobile number the message has to send)
you will get >
Then Type the message you want to send..
Then Press Ctrl+Z...
After sending it will give OK.

then Disconnect and connect the RX ant TX pin of GSM module to Pin 8 and 9
write the program as i described the above steps.

PRODUCT NAME : GSM MODEM
HARDWARE : SIM 300 MODULE
COMMUNICATION : RS232
COMMANDS : AT
INPUT VOLTAGE : 12VDC / 1AMP
*************************************************************************************************************************
ANTENNA - PULL THE ANTENNA OUT IF THE SIGNAL IS WEAK

HOW TO TEST!!!!

1. INSERT THE SIMCARD INTO SIM TRAY BACKSIDE
2. CONNECT THE RS232 CABLE TO THE PC SERIAL PORT - SERIAL PORT PROPERTIES ( RESTORE DEFAULTS - 9600 BAUD RATE)
3. OPEN HYPERTERMINAL FROM WINDOWS START>PROGRAMS>ACCESARIES>COMMUNICATIONS>HYPERTERMINAL
4. SELECT THE COMPORT WITH BAUD RATE 9600
5. TYPE "AT " ECHO "OK" IF ECHO IS OK COMMUNICATION IS OK !!!!!!!!!+


6. CHECK THE LED STATUS ( NETWORK SERCHING , NETWORK CONNECTED, IS SHOWN IN LED STATUS GIVEN BELOW)
****************************************************************************************************************************
Working state of network status indication LED OUTPUT

State SIM300 function

Off SIM300 is not running
64ms On/ 0.8SEC Off SIM300 does not find the network
64ms On/ 3 SEC Off SIM300 find the network
64ms On/ 300ms Off GPRS communication
*****************************************************************************************************************************

TO CHQ GAIN - AT+CSQ=?
TO CHK NETWORK - AT+COPS=?


Examples for send and receive SMS

For sending SMS in text Mode:

AT+CMGF=1 press enter
AT+CMGS=”mobile number” press enter
Once The AT commands is given’ >’ prompt will be displayed on the screen.
Type the message to sent via SMS. After this, press ctrl+Z to send the SMS.
If the SMS sending is successful, “ok” will be displayed along with the message number.


For reading SMS in the text mode:
AT+CMGF=1 Press enter
AT+CMGR= no.
Number (no.) is the message index number stored in the sim card. For new SMS, URC will be received
on the screen as +CMTI: SM ‘no’. Use this number in the AT+CMGR number to read the message.
Voice call
Initiating outgoing call:
ATD+ mobile number; press enter
For disconnecting the active call:
ATH press enter
For receiving incoming call:
ATA press enter



**************************************************USEFUL AT COMMANDS FOR SETTINGS *****************************************************************

TO CHANGE BAUDRATE - AT+IPR=BAUDRATE(Ex 9600) 0-115200 For maore details refer AT commands Document page 33

TO SAVE THE SETTINGS AT&W

TO RESTORE FACTORY DEFAULTS TYPE AT&F THEN SAVE IT AT&W

 

[ud23]

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refer above link it might help you