-= Pete Replied to Bill Grimsley about: USR Courier V34 problems =-

G'day Bill

 PC> i just tried mine using Telix 3.22 DOS starting at a terminal
 PC> speed of 57600, note after i change the port speed all i type is
 PC> ATI4 and the modem senses the change and adjusts.

 BG> That's correct, because the serial port auto-bauds on the first
 BG> AT command (ATI4).  However, if a call comes in BEFORE you issue
 BG> an ATI4 command, the response won't be the expected RING, but
 BG> garbage instead. Seems that ATZ is not a valid command for the
 BG> port to auto-baud,

I've since realized this and reproduced what Paul was stating in the
first place, what i was doing wrong was issueing ATI4 and not ATZ.

 PC> The modem changes speed without problem, i'd say there is
 PC> something wrong with your modem.

 BG> Nope, the anomaly occurs because the USR doesn't auto-baud its
 BG> serial port on an ATZ command.  If you follow this sequence, you
 BG> should be able to see the problem quite clearly...

have done so and reproduced it.

 BG> If you repeat the above with AT&F1 as Telix's init string,
 BG> you'll note that the problem no longer appears.  However, given
 BG> that most people don't continually change their serial port
 BG> rates, I can't see it being a long-term problem.

It seems to be more of a quirk than a problem, once your aware of it
it's not hard to work around i wasn't even aware it existed until Paul
pointed it out.

   -=Pete=-

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