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Reed Switch to RS232

Discussion in 'General Electronics' started by Rob, Nov 21, 2003.

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  1. Rob

    Rob Guest

    Hi All,

    I'm trying to ascertain how best to bring the input from a Reed
    Switch to a DB9 RS232 computer port.

    Here's the scenario: A friend is planning to ride the Alcan 5000
    Rally in 2004 on a KTM Adventurer. I work for a software development
    company who is going to write a rally program (time, distance, speed)
    for him. We are mounting a tablet pc on the bike.

    I can get the Reed Switch setup off the shelf for the standard
    Enduro style computers easily enough. However, I'm not certain what I
    need to do to bring that to an RS232 port.

    Any help would be greatly, greatly appreciated. You can check out
    the website for the rally at:

  2. Robert Baer

    Robert Baer Guest

    Reed relay?? 300 baud rate??
    If so, use external power supply, -15V source thru 4.7K to input pin,
    relay contacts from input pin to +15V should do the job.
    I think that the negative level is a logic "one", but it has been over
    30 years since i worked with teletypes.....
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