Xref: utzoo comp.sys.ibm.pc:30803 comp.periphs:1868 comp.misc:6442
Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!att!mtunb!dmt
From: dmt@mtunb.ATT.COM (Dave Tutelman)
Newsgroups: comp.sys.ibm.pc,comp.periphs,comp.misc
Subject: Re: RS-232 protocol primer (long)
Message-ID: <1543@mtunb.ATT.COM>
Date: 29 Jun 89 12:13:16 GMT
References: <1538@mtunb.ATT.COM> <592@megatek.UUCP> <1954@ssc.UUCP> <32@holston.UUCP>
Reply-To: dmt@mtunb.UUCP (Dave Tutelman)
Organization: AT&T Bell Labs - Middletown, NJ
Lines: 26

In article <32@holston.UUCP> barton@holston.UUCP (barton) writes:
>
>Get this: I ordered an Epson LQ-1050 printer, which according to
>the doc's comes with a "standard" RS-232C serial interface, only
>to find out that the so called "standard" interface is actually
>a 6 pin DIN connector! I wonder which standard they are refering 
>to?

Barton,
As I posted previously, the 232-C standard DOESN'T specify the connector.
(I am told that the newer RS-232-D does, but I haven't seen it;
anyway, your supplier said "C".)

The standard DOES list (in Section Five) a collection of 14 subsets
of the full 25-lead interface, which are allowable standard interfaces.
Several of them use six or fewer leads.

Thus there's nothing in the use of a 6-pin DIN connector to prevent
it from complying with the RS-232-C standard.

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