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Hi, I am trying to use a multi-function port (RS-232/422/485) that is most commonly found on Mini-ITX and SBC boards. Anyway, I was trying to code a transfer program and ...
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  1. #1
    Just Joined!
    Join Date
    Sep 2005
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    1

    RS-232 vs. RS-422 Initialization/Programming


    Hi,

    I am trying to use a multi-function port (RS-232/422/485) that is most commonly found on Mini-ITX and SBC boards. Anyway, I was trying to code a transfer program and the 232 works but the 422 does not. I changed the jumpers to make sure the port was running in 422 but does anyone know if I need to initialize the port any different if I am running in 422?Any help would be appreciated.

    Thanks in advance.

  2. #2
    Linux Newbie
    Join Date
    Oct 2004
    Posts
    158
    RS 422 uses differential signal levels. POSIX does not necessarily supply those signals.

    Try pages 8&9 in this heavy-duty explanation:
    http://www.easysw.com/~mike/serial/

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