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From: irwin@uiucdcs.UUCP (irwin )
Newsgroups: net.micro
Subject: Re: What is RS-432??? - (nf)
Message-ID: <6582@uiucdcs.UUCP>
Date: Tue, 3-Apr-84 22:32:44 EST
Article-I.D.: uiucdcs.6582
Posted: Tue Apr  3 22:32:44 1984
Date-Received: Sat, 7-Apr-84 01:35:08 EST
Lines: 11

#R:uicsg:7600018:uiucdcs:10400123:000:563
uiucdcs!irwin    Apr  3 12:33:00 1984

The RS-232 transmit and receive signals are referenced to ground, the
RS-432 signals are not. They are a balanced pair driven by a differential
driver and received by a differential receiver chip. There have been
articles in BYTE showing how to make an adaptor to convert from one to
the other. The idea is that the RS-432 is less prone to noise since one
wire is driven negative while the other is driven positive in the pair
for each logic level change. A foreign "glitch" induced into the pair
would drive them both the same direction and it would be ignored.