Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!lll-winken!uunet!tektronix!reed!lclark!dan
From: dan@lclark.UUCP (Dan Revel)
Newsgroups: comp.unix.wizards
Subject: modems dmf-32s
Summary: how do you connect modems to dmfs?
Message-ID: <400@lclark.UUCP>
Date: 23 Mar 89 02:34:05 GMT
Reply-To: dan@lclark.UUCP (Dan Revel)
Organization: Lewis & Clark College, Portland OR
Lines: 30

I've been going around and around trying to get these things to work
right and it just seems like a catch 22 situation.  Perhaps someone
can shed some light on this for me.

What I'm trying to do is to connect some 1200/2400 baud modems to our
VAX 750 (4.3bsd unix) to use as dial-in ports.  (The modems are
'Hayes compatible' Practical Peripherals...)

I have the modems defaulting to 2400 baud and answering on the first ring.
With the standard getty (D2400) they had trouble setting the right speed
for 1200 baud calls (they did OK if you sent a break, but sometimes you
just can't send a break, Red Ryder fer instance...).  OK, I thought, I
can change getty to read the connect message from the modem and set the
line-speed accordingly.  Well, it's not that easy because the modems don't
assert a carrier detect until *after* they send their CONNECT message (always
at a known speed, 2400).  OK, the modems can be set to hold CD on, or else
the dmfs driver has bits in dmfsoftCAR which can be set, great, it works!
But now I need to get processes to hang-up when the madem goes off-line,
and with CD dummied up they don't seem to notice when that happens.  I would
like to twiddle the dmfsoftCAR bits but can't get at them until I open the
device, I can't open the device unless the CD is on... around and around.

Any helpful hints and/or suggestions?

Many thanks,
		Dan

-- 
dan@lclark
tektronix!reed!lclark!dan			Dylsexics untie! (-|