Unix 3.2v4.2 to Fujitsu line printer xon/xoff interface
We have a Fujitsu line printer running at 9600 buad with xon/xoff
interface into an Arnet multiport box. Lately we've been experiencing
strang handshaking related issues (either printer gets buffer overflow
or print job stops in middle, printer still online, job still in
queue.) I'm using the 'dumb' interface and spooling everything. My
stty line in the interface script is:
stty 9600 -parenb cs8 ixon ixoff -ixany clocal 0<&1
I've eliminated the cable (four wire, flat), connector and Arnet port
by using a different port cable and connector with the same strange
errors. The old addage 'boot and try again' seems to help as after
booting, the printer works fine for a week or two and then things go
The original installers of the system setup stty lines in the
/etc/rc2.d/S80lp file for each 'printer' port. Reading the Unix doc,
that appears only necessary for direct printing. I'm always spooling.
Is there anything I'm missing?