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  1. Replies
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    Re: gsm modem with 16f877a

    Are you sure the x y z modem that you have not study yet, is working at 2400 ?

    I am sorry but cannot guess. Nor I have the magic ball to tell me what you have, how it must be set-up. It is your...
  2. Replies
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    Re: gsm modem with 16f877a

    This example subroutine is for Wavecom. You have to check the manual of your GSM device for the correct commands.
    Also this example supposes that the GSM device responds with ASCII characters and...
  3. Replies
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    Re: gsm modem with 16f877a

    Modem PIC
    Tx -----------X-----------------Rx
    Rx ------X----|-----------------Tx
    | |
    1k 1k
    | |
    PC ...
  4. Replies
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    16,991

    Re: gsm modem with 16f877a

    1. Is your modem communicating with a PC at the specified speed? You seem to use 2400 baud rate...

    2. Do the trick with a second serial port, two resistors (experiment from 10K down to 1K which...
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