SIM 300 GSM Module

hiii... i m using SIM300 GSM Module in my project.
i need to interface it with the P89V51RD2. Hardware part is done but i m stuck up in software part.. i m not gettin how to start using AT comands for it.. i m using KEIL Software 4 d programming.. module is interfaced with the microcontroller on UART and dat is ready on the PCB..but i m nt able to start with software part including configuration n oder things.. plz help me:-(

hi....
do u hv a list of the AT commands?
if you have them, then to send them to the GSM modem through the controller simply type
printf("AT");
and aftrwads the rest of the commands with some delay in between.
and dont forget to include <stdio.h> as a header file.
Hope that helps.

regards,
shweta1

Thnx a lot 4 d reply. I hv list of all AT commands. ...... Bt i dnt kno how to check GSM Module using AT commands? like connector of our GSM Module is already mounted on d PCB and i m using RS232 for burning d program on d hardware.... plz help me

u need a serial cable for that. connect one end of the serial cable with the on board GSM module and the other end with the serail port of th PC. Then open hyperterminal on the PC and give some name to the connection. Then select the working com port of the PC(usually its Com1 only) and finally in the com1 properties click on the restore default option.
a new connection will be established. Then at the very first type AT and press enter. If the modem replies back OK that means ur GSM modem is working fine.
try until this first.

regards,
shweta1

But How to start GSM Module on board? for that i dint get any AT command for Power ON...

Can i use dis command AT+CPOWD for Power ON?

im nt gttng u. wht do u mean by startng the GSM modem onboard?

u need to switch on the power supply of ur board n thn connect the DB-9 connector of the GSM modem with th serial port of ur PC through serial cable.

regards,
shweta1

I m working on d project of Energy Meter..First let me clear that we are not using a readymade GSM Modem.... we have bought a separate GSM Module n mounted on PCB....n fst v r trying to initiate GSM Module using software....so along with GSM Module we ahve interfaced an LED...so whenever the GSM is ON that LED shud glow!!!

i have used a SIM 300 GSM modem in my projects also. n if im not wrong there is a db9 connector on it along with a power jack(used for supply). rite?

we have 30*2 connector along with the GSm Module.....n that connector is soldered on PCB....n i donno whether it is called db9 connentor or something else....!!!!