🚀 go-pugleaf

A while ago I purchased an HSD Interfax 24/96 NX (fax & data) modem.
I have been successfully using the modem for outgoing faxes, but I
just recently have tried to use the modem for data communications.

The modem is connected to serial port A & I am attempting to use tip
to dial out.  The entry for cua in /etc/remote has been edited to add
parameters du and pn=phonenumber.  (Actually I have tried a number of
different settings here but I can't find anything which works.  Among
other things, I have experimented with both 9600 & 2400 in the cua entry;
being a novice at communications, I *think* 9600 should be ok as the
modem manual suggests something above 2400 to achieve data compression,
then again I tried 2400 as this is, after all, a 2400 baud modem.)

The modem is set up for data communications as suggested in the
manufacturer's literature (which says to use print manager to make the
faxmodem "unavailable" when data rather than fax use is intended.)
(Actually, again, I have tried this both with settings "unavailable" 
and "private" just in case the modem manual is incorrect, but still no
luck.)

What happens is this: in a terminal shell, I use "tip portname" where 
portname is the string substituted for "cua9600" in /etc/remote.  The
response I get is
  
   /dev/cua: device busy
   link down

I have checked /usr/spool/uucp/LCK for LCK..cua as suggested in the next
NSA manual, but this lock file does not exist.

Any ideas ?  Help is much appreciated.  I tried to get some help from 
farnsworth computers in Chicago, where I purchsased the modem, but they 
have not come up with an answer.

Thanks in advance.

John Watts
Purdue University