Chapter
3
Plotter Interconnection
Introduction
This interconnection guide
is
designed
to
help you connect the HP 7475A
Graphics Plotter
to
your computer and verify communication between
them.
IWad the general instructions in the following paragraphs, then locate
and use the interfacing instructions for the computer you are using.
Each instruction set lists a required minimum system configuration,
gives connection instructions for the hardware, and provides a short
program
to
verify that programming information is being sent cor·
rectly from the computer
to
the plotter. Once this has been verified, you
can use the Interfacing and Programming Manual
to
write your own
programs (refer
to
Accessories Available
in Chapter
I),
or you can use a
software package already written for your computer/plotter system.
If Your Computer Isn't Listed . . .
If your computer isn't listed, there
is
a good possibility that it still can
be interfaced
to
the HP 7475A. First, determine which kinds of commu
nication interfaces are available for your computer. If your computer
supports an RS·232-C/CCITI Y.24 interface or an ANSVIEEE
488-
1978 (HP-IB) interface, then it probably can be interfaced to an
HP 7475A. IWad the manual that describes the communications eqnip
ment for your computer, and then detennine how information is sent
and received. Next, refer
to
either Chapter 9 or 10 in the HP 7475A
Interfacing and Programming Manual (depending on which interface
you're using)
to
get a better understanding of how information is sent
and received by the plotter. In the RS-232·C environment, pay particular
attention
to
the cabling requirements between the computer and the
plotter. (Appendix A contains RS·232·C pin allocations and cable
schematics for Hewlett-Packard cables.) Then, choose a computer con·
figuration in this guide that appears similar
to
yours and use this as a
guideline for creating your own communication verification program.
PWITER INTERCONNEcrION
3·1
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