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NNTP-Posting-Date: Tue, 22 Oct 2002 10:08:59 -0500
Subject: RS-485 termination
Date: Tue, 22 Oct 2002 10:19:14 -0500
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Up to now I've been using a PIC'S software SEROUT RS-232 to drive an
optocoupler at only 1200 baud to feed a group of receivers in sort of an
optoisolated current loop situation and it's worked flawlessly.
I need though to eliminate the RFI being generated by the unbalanced
connection and want to change everything to
RS-485, (something I've never "tutored myself" on).
One thing that puzzles me though, if I were to have these
systems where the end-user can install anywhere from 1 receiver to a
maximum of 10 receivers on the line, what kind of termination resistance
could I put on each receiver so that there is a "window" that will be
maximum resistance with one.....minimum with 10?
I'm staying with a mere 1200 baud.
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