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Reed Switch to RS232

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

  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: www.alcan5000.com

    Regards,
    Rob
     
  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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