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Interfacing of GSM module with AT89S52

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Prixy Patil

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Hi,

I am interfacing a GSM Module with the help of a AT89S52 Microcontroller. I am writing the program on C and compiling using Keil.

Please could anyone tell me how do I generate a call through the MC using AT commands and how should I enter it in the C program.

Also please could you tell me about the RS232 connections.

Any help on the above would be highly appreciated,

Thank you.
 

If your GSM module has Rx and Tx pins (TTL) then Cross it to MCU Rx and Tx pins. If Your GSM board has RS232 connector then you need to have a MAX232 or MAX233 (better) between your MCU and GSM's RS232 connector. You need to write Serial receive and send code and use Serial send code to send the AT Commands to the GSM module. Google for "8051 GSM projects".

Post your GSM modules datasheet, manual, AT Command manual, etc...
 

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