autobauding a TrailBlazer on a UNIX PC
Michael A. Goldsmith
mag at astroatc.UUCP
Tue May 24 01:47:59 AEST 1988
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
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Name: Michael A. Goldsmith
UUCP: ... {seismo | harvard | ihnp4} !uwvax!astroatc!mag
arpa: astroatc!mag at rsch.wisc.edu
usmail: 5800 Cottage Gr. Rd. ;;; Madison WI 53716
phone: 608-221-9001 X117
The options expressed above are my own and do not necessarily reflect
those of my employer.
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