SIM 300 GSM Module

so to set baud rate the very first command we need to send is "AT+IPR=xxxx " right? But i m confused 'coz i read that initially we should only send "AT" command, to check the module, and we should get "OK" back in reply.....so now i m confused whether i should use simple "AT" command or "AT+IPR=xxxx"

pakvainim

No you don't have to start with "AT", it is just a quick way to confirm the modem is working,
it does nothing.

Of course the baud rate is already set when the modem switches on, you only need to use
"AT+IPR=xxxx " if you want to change it.
Also you need to know the modems current baud rate to be able to
send "AT+IPR=xxxx " .

Please avoid using bold type unless there is something you need to emphasize.

I checked my GSM Module.. We also tried to send SMS and called other no. n received cal through hyper terminall...everything is working perfectly fine....Now i want to burn the program 4 it on the microcontroller... so what should i write in the printf statement for CMGS in KEIL Software???

thnks in advance :-)

you have to write exactly the same thing you did on hyper terminal its like you are emulating hyperterminal and you on controller.

so printf statement for sending sms would look like this..

printf("AT+CMGS=\"+1234567890\"\r");
printf("this is my message text");
UartSendByte(0x1A); //you have to write some simple byte sending function too coz 0x1A or controlZ is not a displayable character.

//check your mobile inbox :)

okk i will try that and will let u know...

and for sending UART byte do i need to add nethng else in my program or directly write UartSendByte(0x1A); ??

I m sorry
it was UartSendByte(0x1A);

void UartSendByte(unsigned char dat){
    while(!TI);
    TI=0;
    SBUF=dat;
}

add this function..

void main()

{


printf("AT\r\n");
printf("AT+CMGF=1\r\n");
delay(1*2000);
printf("AT+CMGS=\"+1234567890\"\r");
delay(1*2000);
printf("Hello\r");
delay(1*2000);
UartSendByte(0x1A);
delay(1*2000);
}
void delay(unsigned int ms)
{ unsigned int i;
while(ms--)
{
for (i=0; i<DELAY; i++); /* For 1 ms */
}

}


What else do i need to change in this??
Plz reply..

ok i vl add that function.. thnx a lot..

I tried thea program but it is giving something else only on the Hyperterminal... Dint even get message in my inbox:-( Please help me out...