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sim900a serial communication problem

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peeyushsigma

peeyushsigma

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hi everyone,
i am using sim900a gsm module ...i have connected the module through serial port ..but when i am sending any command like AT..the reply is
the same ...please help ....
baud rate is 1200 ,1 stop bit ,no parity bit ..
 

Perhaps you need to explain.
You have a sim900 GSM module. That one has what looks like DB9 RS232-type serial connector to interface with a PC.

To get any of these to work, you normally need a SIM card and arrangement with a mobile network operator.

So - if you have a working interface to your PC, you would be able to say that you actually got a reply to a serial command, even if it was not the reply you wanted.
How do you deliver commands?
From a terminal emulator maybe? From supplied software interface program?
We probably cannot help much unless you can more describe the hardware setup, and what you have already managed to do by yourself.
 

thanks for replying..
i am attaching a picture of board .. DSC_0336.jpg
 

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