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Communication problem between 89V51RD2 & GSM modem

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nirmala h

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Hi everyone,

Communication between 89V51RD2 & Hyper-terminal and SIM300 & Hyper-terminal is proper but, when i try to communicate between 89V51RD2 & SIM300 nothing is happening. I have tried all the ways.
Hardware connection : Controller & Modem both has RS232 so, connecting it directly still no output.
Could anyone suggest what else has to be done..
 

nirmala h

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attach the code which you are using to interface to GSM modem

Hi nikhilele,

Thanks for your response..Finally we were able to communicate between micro-controller & GSM..We changed the communication cable connection, it was the fault..
 

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