Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!uccba!uceng!cradens
From: cradens@uceng.UC.EDU (carl radens)
Newsgroups: comp.sys.mac
Subject: mac+ modem to RS-232 query
Keywords: RS-422, RS-232, modem
Message-ID: <1744@uceng.UC.EDU>
Date: 27 Jul 89 19:55:37 GMT
Distribution: na
Organization: Univ. of Cincinnati, College of Engg.
Lines: 14


I'd like to use a 1200 baud "hayes compat" modem with a RS-232 type
of 25 pin connector with my mac plus.  I read in the Apple hardware
reference (pg5-18,..) that the mac plus seriel interface (8 pin modem plug)
is at the RS-422 standard. They say that you can ground the positive side
of the RS-422 reciever (mac pin 8) and leave unconnected the positive side of
each transmitter (mac pin 6) to get close to RS-232 functional performance.
I have a mac plus to printer cable (8 pin to 25 pin).
Will this work, or is something going to fry?


Carl Radens
radens@ucece1.ece.uc.edu (internet)
cradens@uceng.uc.edu     (internet)