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From: wsr@lmi-angel.UUCP (Wolfgang Rupprecht)
Newsgroups: net.dcom,net.lan
Subject: Re: RS485 communication standards?
Message-ID: <36@lmi-angel.UUCP>
Date: Mon, 28-Apr-86 18:44:35 EDT
Article-I.D.: lmi-ange.36
Posted: Mon Apr 28 18:44:35 1986
Date-Received: Fri, 2-May-86 21:08:11 EDT
Reply-To: wsr@lmi-angel.UUCP (Wolfgang Rupprecht)
Distribution: net
Organization: LISP Machine, Inc (Cambridge Engineering HQ)
Lines: 16
Xref: linus net.dcom:1633 net.lan:1280

In article <> bryanf@fluke.UUCP writes:
>I'm looking for information on RS485 networks that connect industrial
>input-output devices. RS485 is an electrical standard for a multidrop,
>balanced, twisted pair, transmission medium (like RS422). 

	I remember seeing something like that from Corvus. They called
it 'Omninet'. It had normal sync usarts linked over a multidrop, +/-5v
balanced line (at 1Mbaud). Their protocol was all proprietary, so it
probably isn't a very good starting point.

	The Apple Mac-bus is another similar bus, although they use
transformer coupling to the two-wire serial cable. A request to
net.micro.mac should provide lots of info. 

-- 
	Wolfgang Rupprecht		{harvard|cca|mit-eddie}!lmi-angel!wsr