Xref: utzoo comp.graphics:3572 comp.sys.hp:1215
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From: gwyn@smoke.BRL.MIL (Doug Gwyn )
Newsgroups: comp.graphics,comp.sys.hp
Subject: Re: Need to direct drive hpp7585B from VAX-VMS 4.6
Message-ID: <8830@smoke.BRL.MIL>
Date: 9 Nov 88 10:58:51 GMT
References: <10261@ihlpa.ATT.COM>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 10

In article <10261@ihlpa.ATT.COM> tfilm@ihlpa.ATT.COM (Lindenmeyer) writes:
>             We are trying to operate a hp 7585B plotter directly

H-P traditionally uses poor judgement in implementing its RS-232-C
interfaces.  I suspect the plotter in question drops DTR in an attempt
to flow-control (even if you ask for DC3/DC1 flow control); with a bit
of experimentation you may be able to figure out a good way to hot-wire
the handshaking signal lines.  Even then you will probably have trouble;
let us know if you find a way to use one of these plotters at a high
baud rate.  (We never did get our 7550A to work entirely right.)