Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!zaphod.mps.ohio-state.edu!usc!jarthur!nntp-server.caltech.edu!toddpw
From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel)
Newsgroups: comp.sys.apple2
Subject: Re: RS-232-C
Message-ID: <1991Jan22.014249.24066@nntp-server.caltech.edu>
Date: 22 Jan 91 01:42:49 GMT
References: <7030@crash.cts.com> <8049@minyos.xx.rmit.oz.au>
Organization: California Institute of Technology, Pasadena
Lines: 14

jh4o+@andrew.cmu.edu (Jeffrey T. Hutzelman) writes:

>DTR and DSR are the 2 pins on the bottom.  TxD+ and RxD+ are the pins
>you want to use for normal RS-232 communications; they're the two end
...
>Actually, don't trust me on using the positive data lines either; I
>think that's how I did it last weekend, but I don't remember for sure. 

Use the negative data lines. RS-232-C Transmits inverted data, and RS-422
(the mini 8 pin standard) transmits both true (+) and inverted (-) data
together for speed over long distances.

Todd Whitesel
toddpw @ tybalt.caltech.edu