Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!emory!wa4mei!rsj
From: rsj@wa4mei.UUCP (Randy Jarrett)
Newsgroups: comp.dcom.modems
Subject: Re: Setting High Speed w/ 'AT' command set
Message-ID: <770@wa4mei.UUCP>
Date: 11 Aug 90 19:13:05 GMT
References: <9110@jpl-devvax.JPL.NASA.GOV>
Reply-To: rsj@wa4mei.UUCP (Randy Jarrett)
Organization: Amateur Radio Gateway WA4MEI, Chamblee, GA
Lines: 41


In <9110@jpl-devvax.JPL.NASA.GOV> parlier@puente.jpl.nasa.gov (Randy Parlier) writes:


>	I just received an Infotel 2400 XA modem which is supposed to
>	fully support the Hayes commands.  When I first plugged the
>	modem in the "HS" led was lit but the "AA" led was off.

>	After reading the manual I entered the command:

>		"ats0=1&w0&y0"

>	Which turned on the auto-answer mode.  However,  as soon as
>	I did this the High-Speed LED went off.  Now whenever I receive
		       ^^^^^^^^^^^^^^^^^^^^^^^^

>	a call, the modem answers in 1200 mode and I cannot get it to
>	operate in 2400 baud mode.

What probably happened was that your serial port was at 1200 baud
when you made this change.  Hayes and Hayes compatable modems will
default to the baud rate that was in use when the last command was
used.  You need to setup the port at 2400 baud and access the modem
and if it is truly Hayes compatable then do an "at &w" which will
write the setup back. There should be no changes but by doing this 
at 2400 baud your "hs" lamp should come back on and calling systems
should get the 2400 baud answer tones.

Another problem with Hayes and Hayes compatable modems is that if
you have a caller at at 1200 baud then someone calls at 2400 baud
the modem will answer at 1200 instead of 2400 unless an outgoing
call resets it to 2400.  When I was running 2400 baud modems I had
an script that just sent an "AT" out to the modems occasionally when
they weren't busy.



-- 
Randy Jarrett  WA4MEI 
UUCP  ...!{emory,gatech}!wa4mei!rsj   | US SNAIL: P.O. Box 941217
PHONE +1 404 493 9017		      |           Atlanta, GA 30341-0217