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Detecting short wires ou open wires on RS422/485

Discussion in 'Electronic Basics' started by Reginald Jean Louis, Sep 27, 2004.

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  1. Hi, I want to know how can I detect if a pair of wires is shorted or
    open in a RS422/485 environment. The MAX3097 and MAX3098 RS422/485
    receiver have this option, but Maxim IC are a bit expensive. I read
    in a maxim application note that if A\ is open, it will be at the same
    level as A (same thing if this two wires are shorted). So if (Va -
    Va\) < 400 mV (or 200 mV) the ALARM pin is set to true (false
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