Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsd!sdcsvax!ucsdhub!hp-sdd!hplabs!hp-pcd!hpvcfs1!rickk
From: rickk@hpvcfs1.HP.COM (Rick Klaus)
Newsgroups: comp.sys.mac
Subject: Re: Serial Cable Length Limitations
Message-ID: <780002@hpvcfs1.HP.COM>
Date: 31 Mar 89 19:09:40 GMT
References: <6807@saturn.ucsc.edu>
Organization: Hewlett Packard, Vancouver, WA
Lines: 11


     The Mac / Imagewriter II interface is RS422 rather than RS232.  As such
you should be able to run a cable (at the 9600 baud IW speed) nearly a mile
long.  The differential nature of the data lines should help cancel the
RF effects which you are worried about.  The handshake line is not
differential, but due to the low speed of signals on this line, you should
be able to run several thousand feet without any problems.

Rick Klaus
HP Vancouver
rickk@hpvcfs1.hp.com