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gsm interface with microcontroller

shaik shavali

hi, i am trying to interface gsm mobile(ericson )with 8051. mobile and microcontroller responding correctly if i connect with computer serial port(com).but i connect gsm mobile with 8051 with null modem conection mobile is not respoding.in hypertermminal i used without any flow control signals.can you please help me in this?suggest me exate requaired signals to complete communication between mobile and 8051.

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  • 0 in reply to Martin Clausen

    AT Commands are terminated by the single character specified in the S3 register - usually CR

    With command echo enabled, the modem echoes the CR and appends the repsonse formatting character specified in the S4 register - usually LF

    printf("AT\r\n");


    The LF (\n) here is spurious - it probably accounts for the extras you are seeing...

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  • 0 in reply to Martin Clausen

    AT Commands are terminated by the single character specified in the S3 register - usually CR

    With command echo enabled, the modem echoes the CR and appends the repsonse formatting character specified in the S4 register - usually LF

    printf("AT\r\n");


    The LF (\n) here is spurious - it probably accounts for the extras you are seeing...

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