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Path: utzoo!mnetor!uunet!husc6!hao!ames!ptsfa!ihnp4!chinet!randy
From: randy@chinet.UUCP (Randy Suess)
Newsgroups: comp.sys.att
Subject: Re: Hayes Compatible 2400 baud modem on 3B2/400
Message-ID: <1399@chinet.UUCP>
Date: Tue, 11-Aug-87 11:57:49 EDT
Article-I.D.: chinet.1399
Posted: Tue Aug 11 11:57:49 1987
Date-Received: Thu, 13-Aug-87 04:53:38 EDT
References: <120@stech.UUCP>
Reply-To: randy@chinet.UUCP (Randy Suess)
Organization: Chinet - Public Access Unix
Lines: 30

In article <120@stech.UUCP> sysop@stech.UUCP (Jan Harrington) writes:
>I've been reading with interest the problems people are having with Hayes
>modems on 3B2/300's.  
> From what I'm
>reading about what's been said about the Hayes dialer in the Basic
>Networking Utilites, it isn't possible to set the thing up as a bi-directional
>line
>Has anyone got a Hayes or Hayes compatible modem working bi-directionally at
>any speed?  

	I ran into this problem when I first got my 3b2/300 a couple of years
	ago.  The problem is that the outbound dialer needs CD (pin 8)
	hi to open the port for dialing.  But you want CD to follow carrier
	on dial in to make sure users get logged out if the line drops.
	What I did, was design a little black box consisting of a couple
	of one shots sitting between the modem and port on pin 8.
	It leaves 8 hi on the port so that outdialing will work, but
	toggles down and up on changes on pin 8 on the modem.  This
	wakes up getty on dial in, and drops the connection on hang up.
	This has been working fine on the one line I use it on for 
	news uucp traffic.
		I, too, would be interested in a software solution, as
	if the box ever breaks, I don't think I remember how I designed
	it!


-- 
that's the biz, sweetheart.....
Randy Suess
..!ihnp4!chinet!randy