In article <1992May5.email@example.com>, firstname.lastname@example.org (John R Ruckstuhl Jr) writes...
>This article contains
>1. description of communications problem betw Sun wkstation & HP plotter
>Users here have long suffered spurious diagonal lines plotted along with
>their data. We use sun4c workstations running SunOS 4.1.1 and are
>plotting on an HP DraftPro DXL 7575A .
>I've found success with the HP DraftPro DXL 7575A by remaining with the
>default line characteristics (NO ms, fc, fs, xc, xs fields) and,
>!! FILTERING IN AN HP-GL COMMAND TO SET THE DAMNED PLOTTER TO XON/XOFF
Once upon a time I wrote a program to drive an HP7580A from a Vax (VMS),
which used XON/XOFF, and only 3-wire links since the plotter was
some distance from the computer and used fixed modems on internal phone
lines. As I recollect the default setting of the plotter was an ENQ-ACK
protocol. I had to send an initialisation string containing an excape sequence
to set the plotter to XON-XOFF.
Another possible cause of trouble would be if the OS inserts extra CRLFs in
the output. LF is a command delimiter; it would cause the current command to
be truncated. In my program I generated commands on separate lines, so didn't
run into that problem.
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:06:42 CDT