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From: Troy Schultz
User-Agent: Mozilla/5.0 (X11; U; Linux 2.4.17-acpi i686; en-US; m18) Gecko/20010110 Netscape6/6.5
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Subject: Re: RS-485 termination
Date: Thu, 24 Oct 2002 14:37:17 GMT
NNTP-Posting-Date: Thu, 24 Oct 2002 10:37:17 EDT
> 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
> acceptable? ie..
> maximum resistance with one.....minimum with 10?
> I'm staying with a mere 1200 baud.
For some very good information on RS-485 check out the following
Hopefully this will help you better understand the issues at hand.
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