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From: Terry Lambert <terry@lambert.org>
Message-Id: <199706231818.LAA01042@phaeton.artisoft.com>
Subject: Re: getty modem control
To: adam@veda.is (Adam David)
Date: Mon, 23 Jun 1997 11:18:33 -0700 (MST)
Cc: terry@lambert.org, freebsd-current@FreeBSD.ORG
In-Reply-To: <199706212233.WAA19957@veda.is> from "Adam David" at Jun 21, 97 10:33:03 pm
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> > Typically, command interchange with a modem does not involve data
> > exchanges larger than the buffer size.  The CTS/RTS should not be
> > required until DCD is high, and thus the modem is doing data, not
> > command, interchange.
> > 
> > Typically, the symptoms are "no data back from modem until DCD
> > is present".  If you can't change the modem settings, then you
> > will be limited to blind-dialing in all cases.
> 
> I can cu the device and get a normal response without carrier present.
> However, getty times out trying to send the data, with no flicker on the
> modem TXD.

I assume this is your modified getty, since regular getty doesn't
send data, right?

Look at how 'cu' opens the port.  Pay special attention to the
CLOCAL and HUPCL settings.

Note that you MUST be -CLOCAL, HUPCL for correct dial-in operation
(ie: a modem hangup without logout sends SIGHUP to all processes
in the process group to cause a logout, and logging out drops DTR
to modem to cause it to disconnect).

Talking to the modem from getty is evil.


					Terry Lambert
					terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.