autobauding a TrailBlazer on a UNIX PC

[Michael A. Goldsmith]

In article <282 at ditka.UUCP> kls at ditka.UUCP (Karl Swartz) writes:
>
>I recently put a TrailBlazer on my 3B1 (UNIX PC) and now
>I can't in a 1200 baud.  I've got /etc/gettydefs set to
>start with 19200, drop to 2400, then to 1200.  The first
>to work fine, but not 1200.
>
>Swapping 1200 and 2400 makes 1200 work, but then 2400
>won't work.  It seems that it won't go to the third
>choice, whichever it is.
>
>Any ideas?  BTW, this is running uugetty and HDB with
>3.51a system software.
>

It is not necesasary to auto-baud at all with the Trailblazer.
You can set a register (S66=1, I believe.  My manual is at home.)
that locks the serial line betweeen the modem and the 3B1 at
9600 or whatever you wish to use.  When a call comes in, the modem
negotiates baud rates with the calling modem and then communicates
with the caller at that rate.  The serial line remains at the
locked-in rate.

The same thing happens on an outgoing call.  Thus, you can set up
your /usr/lib/uucp/L* files to place all calls at 9600 (or whatever)
and uucp will be unaware that the actual communication is taking
place at a lower rate.

BTW, you can also chose (check the manual, I don't remember which register)
whether to use XON/XOFF or RS-232 handshake signals for flow control.

Hope this helps.


Michael A. Goldsmith
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Name:	Michael A. Goldsmith
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