SIM 300 GSM Module

i know one db9 connector which we are using is RS232.......if u r talking about this db9 connector then wat is it got to do with GSM Module?

see, i guess one db-9 connector will be there to program the controller.
im talking abt the db9 connector which is on the SIM 300 GSM module. through that db9 connector u can communicate the PC and th GSM.

We dint get any db9 connector with GSM Modul!....!!!. but d one which v r usin can be connected 2 PC to burn our program on the microcontroller...so now how is it going to help to initiate our GSM?.

printf("AT+CPOWD=0");
printf("AT+IPR=9600");
printf("AT&W");
printf("AT\r\n");

This is the program that i wrote...so can i use this code to start off with my GSM Module?

hmm....
the first command should always be
printf("AT");
then u can write the commands according to what you want the GSM to do.
I dnt knw about the meaning of the first command that you used ie
printf("AT+CPOWD=0");
n can upload a snap of ur project?

i can upload a snap....but it vl tk tym so i vl do it 2morrow........will wait 4 ur cooperation 2morrow....

I want to know that whether we have to burn the "AT" command on the microcontroller or we can check the GSM Module by directly using Hyper Terminal???

well if you are checking your module to be working or not then you can test it using Hyper terminal.

ofcourse when you are making controller based application you have to burn the commands inside it so that controller can send it.

and.. you forgot to send \r after each command sent to modem from controller.

no need to send \n after every command.

Hello pakvainim
According to the Sim300 pdf you need to set the PWRKEY pin (Power on)
low for 1.5 seconds then high.
The modem will send the text "RDY"

As far as I can see AT+CPOWD =1 will turn the modem off,
but AT+CPOWD =0 will not turn it on.

Can you write some code into your micro to read whatever the modem sends to you
and pass that back to your PC for you to read in Hyperterminal.

Can you supply a circuit diagram of your project ?

you will only get RDY message if modem is configured with specific baudrate using AT+IPR. so do not expect any message from modem if modem is in autobaud mode.

you can check modem configuration using AT+IPR?
if you get 0 then modem is configured for autobaud.