#: 6718 S12/OS9/68000 (OSK)
    15-Sep-90  21:47:55
Sb: #6560-OSK TSmon
Fm: Jay Truesdale 72176,3565
To: Jay Truesdale 72176,3565 (X)


Greg,

While I didn't ask the origional question, I am remotely interested in a TSMON
that supports modems for OSK.

Some thoughts on programming Hayes "compatible" modems...

They will only connect at speeds up to the one they are initialized with. I.e.
if you initialize the modem at 1200 BPS, it will NOT connect at 2400 BPS even
if the caller is capable of it.  I'd just start at 19.2KB and then work
downwards until I got an intelligible response and mark that as my maximum
speed.

I agree that using the text answers from the modem is the way to go.  There is
no standard for the numeric codes above 1200 BPS.

The product ID code (ATI) is useless for determining the type of modem attached
since other "compatible" modems don't return the same response that the
equivalent Hayes modems do.

It is a good idea to send the initialization strings to the modem one at a time
instead of grouping them together like "ats0=1V1X4" because we had a (in)
"compatible" modem that was sensitive to the ORDER of the commands sent.  (I
was ready to give the manufacturer a REAL nasty phone call and I *REALLY*
wanted to tell the customer to go buy a real modem but the jerks in sales nixed
that idea. )

Some modems don't like lower case.

Different modems have differing amounts of time needed between lowering/raising
signals and sending them a command.

Which leads one to the conclusion that there is NO SUCH THING AS A HAYES
COMPATIBLE MODEM!  (In fact Hayes themselves said this in a large format ad a
while back that we programmers gleefully posted on the wall at work in
agreement.)


While I'd like to have a modem capable TSMON available someday, right now I've
got too many irons in the fire to do anything about it myself.

Regards,

-J