Set up a data connection Telit module

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  1. Q:

    I’m able to set up a data connection and transmit data but the characters I am sending to the GM862 are not received. Why?

     

    A:

    The default flow control is hardware (RTS/CTS). Therefore your
    application should be able to manage those lines.  If your application
    doesn’t use HFC then you have to disable it with AT&K0.

    The hardware flow control works in this way:

    when
    the AVR has filled its receiving buffer and needs to stop the incoming
    data from the module it RAISES to 3.V the RTS signal and the module will
    stop sending data until the RTS is HIGH on the 2.8V interface ( note
    that RS232 levels are inverted).

    On the opposite direction, when
    the module needs the AVR to stop sending data, it RAISES its CTS and the
    AVR must stop sending data to the module until the CTS is HIGH.

    For the other signals, you can ground the DTR and leave open the other control signals (RI, DSR).