Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!ncar!elroy.jpl.nasa.gov!ames!dftsrv!mimsy!mojo!russotto
From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.misc
Subject: Re: Wiring for hayes modem w/handshaking
Message-ID: <1991Mar26.184152.2837@eng.umd.edu>
Date: 26 Mar 91 18:41:52 GMT
References: <1991Mar24.192306.11160@eng.umd.edu> <1991Mar24.234125.7088@unx2.ucc.okstate.edu>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 19

In article <1991Mar24.234125.7088@unx2.ucc.okstate.edu> minich@unx2.ucc.okstate.edu (Robert Minich) writes:
>ogawa@orion.arc.nasa.gov (Arthur Ogawa) writes:
>: 
>|>Interestingly enough, the NeXT's serial port is RS-423, rather than
>|>RS-422, as in the Mac. The former supports the four independent handshaking
>|>signals.
> 
>by russotto@eng.umd.edu (Matthew T. Russotto):
>| How many pins on the NeXT's port?  In order to support four handshaking
>| signals, you need at least 9 pins.
>| (TxD+, TxD-, RxD+, RxD-, CTS, RTS, DSR, DTR, Gnd)
>
>Not if you don't use differential signals.

Then how is it different from regular RS-232?

--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.