Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!gatech!udel!burdvax!bmiller
From: bmiller@PRC.Unisys.COM (Bruce J. Miller)
Newsgroups: comp.sys.ibm.pc
Subject: Re: RS-232 protocol primer (long)
Message-ID: <10690@burdvax.PRC.Unisys.COM>
Date: 23 Jun 89 18:07:07 GMT
References: <589@megatek.UUCP> <1538@mtunb.ATT.COM>
Organization: Unisys Corporation, Paoli Research Center; Paoli, PA
Lines: 26

In article <1538@mtunb.ATT.COM> dmt@mtunb.UUCP (Dave Tutelman) writes:
>In article <589@megatek.UUCP> hollen@megatek.UUCP () writes:
>
>In fact, your comment about the RS-232 standard itself needs some
>corrections...
>
>> The RS232 "standard" is merely a document which designates
>>the accepted use of the 25 wires in a cable and the physical configuration
>>of the size and shape of the connector (DB-25). 
>
>Why is the word STANDARD in quotes?  There is, in fact, a REAL LIVE
>EIA standard, designated RS-232-C and dated 1981.  (Originally 1969,
>reaffirmed 1981.)  It DOES NOT specify the DB-25 interface connector,
>or any interface connector at all.... 

ANSI/EIA RS-232-D, issued January 1987, now specifies not only the
physical connector, but also such esoteric things as "finger clearance"
(i.e., how close together you can put RS-232 25 pin D connectors so you
can get the cables on and off).




	Bruce Miller (bmiller@burdvax.prc.unisys.com)
	<Insert virus code here>
	Vacuum tubes are not dead - they just smell that way.