> I've got a situation where I need to sense maybe 24 contact closures to
> "ground" and drive about 24 open drain outputs. The sense and drive
> circuitry needs to be on an isolated supply to avoid a ground loop with
> the equipment that is driving it (referenced to its ground). It seems like
> the simplest way to get data back and forth is to use a UART in a PIC on
> the floating side and two opto-couplers, one in each direction to talk to
> a UART on the nonfloating side.
> 
> Any ideas for something simpler?

I don't get the full picture. Is there one "ground" to which the 
switches close, or one per switch? Idem for the OC outputs?

-- 

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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