Re: SUMMARY: printcap, Sun wkstation & HP plotter

From: A.Daviel (advax@reg.triumf.ca)
Date: Wed May 06 1992 - 17:51:00 CDT


In article <1992May5.213313.15488@eng.ufl.edu>, ruck@zeta.ee.ufl.edu (John R Ruckstuhl Jr) writes...
>This article contains
>1. description of communications problem betw Sun wkstation & HP plotter
<deleted>
>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 .

<deleted>

>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
>!! HANDSHAKING
>
<deleted>

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.

Andrew



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