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From: touch@dsl.cis.upenn.edu (Joe Touch)
Newsgroups: sci.electronics
Subject: Re: Converting RS-422 to RS-232
Message-ID: <34494@netnews.upenn.edu>
Date: 10 Dec 90 18:34:25 GMT
References: <1990Dec10.173757.1162@ccu.umanitoba.ca>
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Reply-To: touch@dsl.cis.upenn.edu (Joe Touch)
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Organization: University of Pennsylvania
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In article <1990Dec10.173757.1162@ccu.umanitoba.ca> kujanpa@ccu.umanitoba.ca writes:
>
>I think the problem comes from the Mac (RS-422?)
>talking to RS-232.  All we use is a modified cable
>to emulate RS-232.  Over long distances the voltage
                          ^^^^^^^^^^^^^^
>level coming out of the Mac is very small (ie. not

The first problem isn't the MAC, its the RS232.  RS232 is
designed to go over less than about 30 yards or so.  RS422
is a balanced-pair differential, which IS capable of
going further.

Joe