> chip, send the logic level output on to the input side of a MAX488 or 
> SN75176 driver chip and leave it at that.

You are never receiving ('one-way RS-485') so you don't need to switch
the direction, and you don't need the resistors (but you do need a
resistor at the far end of the cable!). You can use either SN15176 or
SN15179 (or equivalents).

The major hassle when converting beween RS-232 and RS-485 is switching
directions and (in more difficult situations) buffering of the RS-232
data, but neither applies to your 'send only' case.

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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