Mail Archives: opendos/2004/02/08/21:47:44
Originally to: shadow AT shadowgard DOT com
Hi shadow AT shadowgard DOT com,
You wrote to All on 07.02.04 about "X00 and other stuff":
[snip to this portion]
s> I'll have to look up the settings for "lock baud rate" on a USR.
s> That's one of the things I do when I first get a modem. And I then
s> save it into the non-volatile RAM in the modem so I can just do an
s> ATZ and have the modem be set the way I want it.
Make sure to get hold of a USR manual. Reason: USRs, generally,
use the ATZ and ATZ1 commands somewhat differently from other
modems.
i.e. in short:-
USR modems restore the port speed that was in use when the AT&W
command was issued (saving the profile) and that port speed is
restored in the modem when ATZ is issued. e.g.: With your port
speed set to 57,600, you issue the following command:
AT&F1&W^M.
You then change the port speed to 38,400, and issue the following:
ATZ1^M.
The modem will now be configured to expect a port speed of 57,600.
Your PC port speed is 38,400. If the modem now receives a call, it
will send RING at 57,600bps, and your program will _not_ see the
RING, because the port speed is mismatched. If, however, you send
_any_ AT command (except ATZn), the modem will re-configure to the
current port speed (38,400) and will operate normally.
The rule: configure the modem and save the profile at the _same_
port speed you intend to use with your software.
Get the idea ??
TTFN,
Archie
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