Re: Second Serial Port on Multia

E.T.C. (mfkole4@xmission.com)
Wed, 30 Oct 1996 11:31:46 +0000

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Please figure out what is wrong with your e-mail address!!! We have
30 e-mail messages for you.

Thanks!!!

Date: Thu, 31 Oct 1996 00:23:08 -0500 (EST)
From: "Brian E.W. Wood" <beww@intac.com>
To: axp-list@redhat.com
Cc: axp-list@redhat.com, Alastair Martin <alastair@annex.co.uk>
Subject: Re: Second Serial Port on Multia
Reply-to: axp-list@redhat.com

On Wed, 30 Oct 1996, Andrew J. Hutton wrote:

> >
> > > Can someone please tell me where the second
> > > serial port on my multia is???
> >
> > It may sound silly, but the second serial port is presented on the
> > same 25-pin connector as the first port. The trick is that it uses
> > rarely used pins and you need to make up a splitter cable to use
> > both ports. This is the infamous "Y-Cable" - near unobtainable, but
> > check out http://www.annex.co.uk/systems/udbycabl.html if you want
> > to make up your own cable...
>
> I believe the Sparc standard is being used, therefore any Sparc A/B Cable should work. I would appreciate it if someone could confirm this, I've misplaced mine...
> --
> Linux sparta.achilles.net 2.0.18 #1 Wed Sep 11 09:11:54 EDT 1996 alpha

Actually the "rarely used" pins that are used are in fact part of the
RS-232 specification, which specifies two ports on the standard DB-25
connector. Assuming that the SPARC adheres to the official standard
then its cable should work as well.

This standard is for asynchronous ports. Although modems will work
when connected directly to a two-port connector you may (read will)
run into trouble if you connect a synchronous device.

For example my Motorola Bitsurfr will NOT work when connected
directly to the UDB port but works just fine (asynchronously)
when connect to either port of a "Y" cable.

Brien E.W. Wood
beww@intac.com

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