As Wirt points out, there is handshaking going on when you use function keys
(keys lock until a DC1 is received).  It is possible that you have flow
control enabled on the modems, such that characters such as DC1 are treated
by the modem as flow control characters to be acted upon my the modem, and
not as data to be passed along to the terminal.

-----Original Message-----
From: Wirt Atmar [mailto:[log in to unmask]]
Sent: Tuesday, July 16, 2002 11:29 AM
To: [log in to unmask]
Subject: Re: Modem Problem


Terry asks:

> I am installing some modems on a DTC48 and 939KS.  The modems work ok
except
> they do not recognize function keys.  If I type the escape sequence for
the
> Function key and hit return they work ok.
>
>  Does anyone have any ideas as to the problem?

Your problem almost certainly doesn't have anything to do with the modems
themselves. Function keys have three modes: local, transmit, and normal, and
they react differently with the host.

If the function keys are in local mode, nothing gets transmitted to the
host.
The function key contents are executed wholly locally in the terminal. If
the
keys are in transmit mode, the key contents are transmitted to the host in
one fell swoop and a CR is attached at the end, and the keys go into a
locked
mode (if you press a second function key) until a DC1 is returned from the
host. If the keys are in normal mode, each character is transmitted one
character at a time, just as if you typed it by hand. In this last mode, you
have to purposefully put in CR's if you want them there.

The last mode should be indistinguishable from you typing the sequences by
hand.

Wirt Atmar

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