Re: linux and rs-485
From: Paul Keinanen (keinanen_at_sci.fi)
Date: 08/09/03
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Date: Sat, 09 Aug 2003 17:56:32 +0300
On Thu, 07 Aug 2003 13:33:00 +0930, Andrew Kelly
<Andrew.Kelly@motorola.com> wrote:
>RS-485 allows multiple transmitters and receivers on the line at
>the same time (up to a limit - 10 I think from memory?) ...
Standard RS-485 transceivers allow 32 stations on a single half duplex
balanced pair. Non-standard low current receivers may allow 128 or
even more.
>If you are happy for your PC to use two tranceivers, get a converter
>that has an "always Tx'ing" converter hooked to your rs-232 Tx line,
>and an "always Rx'ing" converter hooked to your rs-232 Rx line ...
That is RS-422, which requires two balanced pairs.
Unless you can hook up the Tx+, Tx-, Rx+ and Rx- wires at both ends of
the cable to separate terminals at both ends, your suggestion does not
work.
Paul
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