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NNTP-Posting-Date: Wed, 23 Oct 2002 08:13:42 -0500
References: <3DB580A9.C3C4AC4A@scazon.com> <3DB64E6D.7E42A7A8@scazon.com>
Subject: Re: RS-485 termination
Date: Wed, 23 Oct 2002 08:23:57 -0500
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DON'T FORGET that you will need
> a third (ground reference ) wire as well for RS485.
But do the grounds need to connect between Xmtr and Rcvrs? I see in my
National data sheet (AN1057,figure 1) that it shows a single 2 wire twisted
pair....do you mean the individual "circuit ground" for the chips?
I thought you meant a "short run" when you said stubs.
One problem I may run into is that my transmitter will probably be located
in a central terminal room with all the receiver cable runs leading to the
one room.....how do you think this will influence things? The cable length
could be a mere 25' to one room for instance and up to 200' to the farthest
perhaps. I would put a jumper on my receivers so that the farthest rcvr
could be terminated.
By the way, the reason I'm delving into RS485, from what I've read is that
RS422 is being overshadowed by 485's advantages. ??
THANKS everyone, very kindly.
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