Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!aplcen!decuac!ufp.enet.dec.com!murphy
From: murphy@ufp.enet.dec.com (Rick Murphy)
Newsgroups: comp.sys.dec
Subject: Re: modem dial in AND out possible under Ultrix?
Message-ID: <2847@decuac.DEC.COM>
Date: 18 Dec 89 18:17:43 GMT
References: <29435@prls.UUCP> <2197@isaak.isa.de> <2844@decuac.DEC.COM>
Sender: guest@decuac.DEC.COM
Reply-To: murphy@ufp.enet.dec.com (Rick Murphy)
Organization: Digital Equipment Corporation, Landover MD
Lines: 32


(Reference to dialin/out via DMF-32's...)
 
>     "Easy" ?  Please don't tell me that. I've been knocking my brains out
>   tring to get it to work, though I do know many Ultrix sites are using
>   'shared' mode.
>      I'm using genuine Hayes Smartmodem 2400's on an DMF-32 (VAX 11/750).
>   Even though I've copied all related files from another Ultrix system,
>   I still can't get 'shared' mode to work.
>      Prehaps someone would be kind enough to tell me how the modem must be
>   configured (i.e. contents of the significant S-registers, or a list of
>   equivilant AT commands ).
> 
>    Thank you,

Never having tried it - I still have a few comments.
The DMF32 only has modem control for the first two ports. If you use it with
a modem on the rest of the ports there's no way for the system to determine
that a hangup has taken place. Huge security hole..
The second problem is a "feature" of the DMF's modem control ports - if 
the CD signal isn't asserted, they drop incoming characters on the floor.
You can send "AT" to wake the modem, but the response gets eaten.
There is a command that can be used to tell the Hayes to assert carrier when
the autodialer is in operation; not having a Hayes manual, I can't tell
you offhand what it is - but that may be all you need to know to find it.
	-Rick
 
Rick Murphy, WA1SPT/4                   Digital Equipment, Landover, MD
murphy@ufp.dco.dec.com                 (UFP stands for United Federation
                                         of Planets - not what *you* were
decwrl!ufp.dco!murphy                    thinking!)
Disclaimer: I don't even speak for myself - my wife does!