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From: hhs@hou2h.UUCP (H.SHARP)
Newsgroups: net.dcom
Subject: Hayes 2400 modems
Message-ID: <991@hou2h.UUCP>
Date: Wed, 31-Jul-85 12:15:42 EDT
Article-I.D.: hou2h.991
Posted: Wed Jul 31 12:15:42 1985
Date-Received: Thu, 1-Aug-85 23:51:03 EDT
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 21

I have been trying out a Hayes 2400 modem working with a 
Teletype 5420 terminal.
I have noticed that the Hayes modem does not raise Data Set Ready
until it gets answer tone from the remote modem.  The Teletype
terminal will not receive data from the modem unless Data Set Ready
is raised.  This means that I can call out using the keyboard, but
I get no echo from the modem and I get no call progress messages from
the modem.  Once the connection is made, everything works normally.
I have not found anything in the Hayes manual for setting the modem
so that Data Set Ready follows Data Terminal Ready or any other 
solution.  I am strapping Data Set Ready high on the terminal side.
This problem doesn't occur on the HP 2621 terminal.  What would happen
if a terminal needed Data Set Ready for transmission?

Another problem I have noticed is using the Hayes to call into
our computer.  The computer is using AT&T modems.  About three
out of four times I call in, after I get the "Connect 1200"
message (no 2400 bps modems on the other end) I get a line of
garbage on the screen.  The computer times out and disconnects the
call.  Anyone else notice this problem?