Subject: trouble interfacing an HP86B to an HP7040 plotter with a serial - test-drb@ccmp.vtda.org

12 Sep 2003

I still have the homemade cable I used to connect a HP7040 to my original
IBM PC in 1983. It is a DB-25S (PC end) to DB25P (plotter end).

Plotter   PC
  1           1
  2           3
  3           2
  4           5
  5           4
  6         20
  7           7
20           6

This would be a null modem cable.

I also found this HP link for a newer plotter
http://www.hp.com/cposupport/plotters/support_doc/bpp01379.html

Michael Holley
www.swtpc.com/mholley

...
  From: "RHahm" &lt;rhahm(a)nycap.rr.com&gt;
 To: &lt;cctalk(a)classiccmp.org&gt;
 Cc: "Vassilis Prevelakis" &lt;vassilip(a)dsl.cis.upenn.edu&gt;du>,
    "John Shadbolt"
   &lt;john_shadbolt(a)talk21.com&gt;
 Subject: trouble interfacing an HP86B to an HP7040 plotter with a serial
   interface
 Date: Tue, 9 Sep 2003 12:51:44 -0400
 Reply-To: cctalk(a)classiccmp.org

 Hi,

 I am having trouble interfacing an HP86B to an HP7040 plotter with a serial
...
  interface.

 I have two HP serial interfaces: standard with male DB25 connector and
 0pt.01 with female connector.

 The plotter has a male DB25 connector.

 I have connected the standard with with a gender changer and the opt. 01
 directly without success.

 I typed PLOTTER IS 10 and (the baud rate on the plotter is set at 9600)I get
...
  an error message.

 This is the first time I have tried a serial connection and unfortunately I
...
  don't have any
 documentation for the HP serial interface.

 Do I need a null modem for the opt. 01 serial interface?

 What am I doing wrong?

 Thanks,

 Bob 