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From: jpr@dasys1.UUCP (Jean-Pierre Radley)
Newsgroups: comp.unix.questions,comp.dcom.modems
Subject: Re: telebit trailblazer plus at 19200
Keywords: the Letter 'A" ; resister S51
Message-ID: <10903@dasys1.UUCP>
Date: 11 Oct 89 17:29:18 GMT
References: <177@lgc.UUCP>
Reply-To: jpr@dasys1.UUCP (Jean-Pierre Radley)
Organization: TANGENT
Lines: 22

In article <177@lgc.UUCP> max@lgc.UUCP (Max Heffler @ Landmark Graphics) writes:
>I have been successfully communicating from a Compaq 386/25 running ISC 386/ix
>2.0.2 at 9600 with a Telebit Trailblazer Plus.  When I attempt to change my
>existing Systems and Devices files for 19200, I can not even get to the dialing
>phase.  The modem responds with garbage, implying a baud problem very early
>in the modem init. sequence. 


Two things, one of them omitted from some versions of the manual for the
Trailblazer Plus: S51 = 254 is for Autobauding at 19200.

And when S51 = 254 or S51= 255, the modem selects the interface speed upon
seeing a letter 'A'.  You may need to modify your Dialer source code, or
your chat script, to send an 'A", or maybe two of them, before you try to
send a number to dial.

Try talking to your modem with 'cu' at 19200, with register S51 set at
254. If the first thing you type is "AT", you may not get anything back.
But if you type "AAT", then you see the "OK".
-- 
Jean-Pierre Radley					      jpr@jpradley.uucp
New York, NY					      72160.1341@compuserve.com