dv@well.UUCP (David W. Vezie) (02/10/89)
I have a Supra 2400 baud modem. It works great, and is apparently fully
Hayes compatible. There is one problem I'm having with it, and I wonder
if anyone else out there has experienced similar problems.
First system info:
It's hooked up to a Sun 2/120 running SunOS 1.1 (don't look at me like
that -- we're planning to upgrade. I don't think it's a software problem
anyway). It's hooked up to a systech board (if this is meaningless,
ignore it), and is used for both dialin and dialout using Sun's dual
device system (if you open it with the high bit set in the minor device
number, then it opens immediately, and you can call out. If you open it
without it set, then it blocks on the open until carrier is detected,
and noone is currently dialing out on it. It's a great system).
Now that that's out of the way, here's the problem: If I dial out
at 2400 baud, everything is fine with the world. I can dial in later
at 1200 baud or 2400 baud, and it does the Right Thing (connects at the
proper speed, and the software takes care of the rest). However, if
I dial out at 1200 baud, then the next time I dial in, it connects at
1200 baud, even if I tried dialing in at 2400 baud.
Anyway, I called Supra customer service, and they said that it was a
problem, and the only workaround is to send a string (even AT\r) to the
modem at 2400 baud after dialing out at 1200 baud. With the software
we're using (tip), that's not very feasible.
The funny thing is that I talked with Hayes at a conference, and they
said (after saying that Hayes modems are so much better because they
are guaranteed compatible) that what I described was a "feature" of
Hayes modems as well (yes, he said "feature", although I would consider
it a bug).
Now, we're looking to buy some more 2400 baud modems, preferably for the
same or similar price as the Supra. Does anyone know if other Hayes
compatible modems have the same problem (or rather, which ones don't!)?
It's tricky, because in order to be Hayes compatible, you have to have
this bug (if you think it's a feature, let me know. I'm not convinced!).
--
Name: David W. Vezie | Voice: "Hey, Dave"
UUCP: {apple|pacbell}!well!dv | Last-name-pronounced: "VEE-zee"
Company: Lucasfilm Ltd | Phone: +1 415 662 1222