Path: utzoo!attcan!uunet!lll-winken!scooter!neoucom!wtm
From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: comp.dcom.modems
Subject: Re: short info from a telebit's brochure
Summary: I think it is done with S103
Message-ID: <1468@neoucom.UUCP>
Date: 17 Jan 89 23:58:40 GMT
References: <1306@altger.UUCP> <1465@neoucom.UUCP> <282@microsoft.UUCP>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 53


Page 4-29 of the 90048-01 Rev.A "Commands and Registers Reference
Manual" for the Trailblazer Plus says that automatic redial is
accomplished with S103.  It looks like option 2 is the one:

"2   Enable automatic dialing whenever the modem is on-hook and the
     DTR control signal is active.  This option allows the modem to
     automatically attempt to re-establish a dropped connection
     without operation intervention which is useful when the local
     DTE behaves as if it were connected to a dedicated line.

     ...

     In each of the above cases, the modem will attempt to connect
     in either originate or answer mode depending on the setting of
     the S100 register.

     For modems which have front panel switches, the number dialed
     is dependent on the setting of the A/B switch when the dialing
     function is initiated.  If the A/B switch is in the A position
     the first number (N0) in the Number Directory is dialed;
     whereas if the switch is in the B position the second number
     (N1) is dialed.

     If you modem does not have front panel switches, it will dial
     the first number in the Number Directory when the auto-dial is
     initiated via the DTR signal as described for options 1 and
     2."

S101 is probably the register for you if you are running the
trailblazers on a leased line.  Option 1 attempts a connect in
answer mode every 20 seconds whenever a carrier is NOT present.
Option 2 attempts to connect in originate mode every 20 seconds if
a carrier is not present.

You'd need to remember to set S103 back to option 0 after you
finish your call.  Uucico would need minor hacking if you were
running a uugetty on the line to make sure that the S103 was at
option 0.  I'm not exactly sure what to do about the potentially
indeterminate start-up delay if you didn't have HDB source for
hacking.  In Xenix you could hanle it nicely in your dialer.c
script.  I suppose with HDB, you could do your dialing inside your
own c program and then fork uuccico and wait for uucico to finish,
then go ahead and kill the modem.

By the way, I use a bunch of /d (22 to be exact) in my dialer
expect-send string when attempting a PEP answer last connect.  We
have ESS-4 (apparently) here, and even long distance calls seem to
make it in 40 sec (including the answer handshake).  That gives us
4 seconds to spare.  Season to tase for crossbar or step-by-step
(yuck!) offices.

--Bill