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RTS behavior

Discussion in 'Electronic Design' started by Sam, Apr 12, 2008.

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  1. Sam

    Sam Guest

    Hi everyone,

    (except advertising spammers...)

    I use the command line:
    COPY anyfile.dat COM2
    to send in a simple way a stream of data to a device. It works fine. Only
    the Tx line is used here.

    The serial port setting as reported by the command MODE COM2 is:

    Serial port status COM2:
    Baud : 115200
    Parité : None
    Bits de données : 7
    Bits d'arrêt : 1
    Temporisation : OFF
    Protocole CTS : OFF
    Protocole DSR : OFF
    Sensibilité DSR : OFF
    Circuit DTR : OFF
    Circuit RTS : ON

    I would like to know a bit more about the RTS line that goes high (negative
    to positive voltage that is) during the
    transmission. I would like to use it to control a gating circuit at the
    receiving end.

    So my question is:
    Is the RTS line goes high *before* the first byte is sent and goes low
    *after* the last byte has been sent?

  2. I dunno about MS software, but normally, if no hardware handshaking,
    RTS is just a bit in the UART that you can set and reset, it
    will stay set or reset all the time.
    The above list you show suggests RTS is 'on' all the time.
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