) How To Use Hp 7470 Documentation; For First Encounters With The 7470; For First Encounters With Hp; For Experienced Hp-Gl Programmers - HP 7470A Interfacing And Programming Manual

B
HP-IL — Hewlett-Packard Interface Loop — an interface used on some
Hewlett-Packard personal computing products to communicate with
peripheral devices such as the 7470 plotter. The HP-IL interface is
standard on the Option 003 plotter.
)
) How to Use HP 7470 Documentation
) This manual contains interfacing and programming information for
the HP 7470 Plotter and all its interfacing options. The Option 001
plotter is equipped with the RS-232-C/CCITT V.24 Interface. The Option
002 plotter is interfaced through the Hewlett-Packard Interface Bus
(HP-IB) which conforms to ANSI/IEEE 488-1978 specifications. The
Option 003 plotter is equipped with the Hewlett-Packard Interface Loop
for personal computing devices. All interfaces use the Hewlett-Packard
Graphics Language (HP-GL) for control of plotter graphics capabilities.
Unless specifically noted, all information in this manual pertains to all
configurations.
NOTE: All information in this manual for Option 001 plotters applies
equally to RS-232-C and CCITT V.24 interfaces. For purposes of sim­
plicity, both are referred to as RS-232-C. ■
Documentation for this plotter is designed to enable you to use the
plotter easily without reading unnecessary manuals. All plotters are
shipped with this manual, an Operator's Manual (Part No. 07470-
90002), an Interconnection Guide (07470-90003), and a Reference Card
(07470-90004). The Operator's Manual contains all information you will
need to operate, but not program, the plotter. The Interconnect Guide
explains how to physically connect your plotter to certain computers or
calculators, and contains instructions for verifying that the connection
has been made. The Reference Card contains a list of the plotter's HP-
GL instructions with their parameters, its device control instructions
for the RS-232-C version, and a list of error numbers and their meanings.
1-2 GETTING STARTED
For First Encounters with the 7470
If you have just received your HP 7470, read the Operator's Manual
and the Interconnection Guide before attempting to operate the plotter.
After inspecting your plotter, its power cord, and accessories as
described in the Operator's Manual, refer to the appropriate chapter of
this manual for initial setup and addressing or handshaking protocol
for your configuration. RS-232-C users should read Chapter 10, HP-IB
users should read Chapter 9, and HP-IL users should read Chapter 11.
For First Encounters with HP-GL
If you have never programmed in HP-GL, after reading the interfacing
chapter, read Chapters 1 through 5 in order. These chapters describe
the instructions you will use in almost every application. Running the
examples given with the instructions will help you learn. Next, read
Chapter 8 to see how all the instructions work together in a program.
When you have an application requiring digitizing or plotter output,
read Chapters 6 and 7.
For Experienced HP-GL Programmers
If you are an experienced HP-GL programmer, you may find Appendix
B of this manual or the Reference Card most helpful. Since there are
differences in syntax between this and other plotters, you should read
Chapter 1 of this manual before programming. The 7470 has added
capabilities not found in earlier plotters. Among these are the ability to
plot to non-integer user-unit values, to mirror labels using negative size
and direction parameters, and to output the current window values. To
understand these differences, you need to read the sections on scaling
(SC, Chapter 2),- plotting (PA and PR, Chapter 3), and setting label size
and direction in Chapter 5. In the instruction set summary in Appendix
B, page numbers for the complete description are listed with each
instruction.
Understanding Manual Conventions and Syntax
Before reading any part of this manual, you should understand the
meaning of type styles, symbols, and number representation used in
text. A detailed explanation of syntax symbols is given in the section
entitled HP-GL Syntax in this chapter and Command Syntax for
Device Control Instructions in Chapter 10. The following conventions
also apply. Words typed in small boldface type are either buttons,
switches, or words actually found on the plotter or computer. Headings
in liWHiMJI type are used to help locate specific parts of the writeup of
an instruction. i:i*'ia:M^ type in a smaller size is used to denote a single
ASCII character which should be sent to the plotter. Numbers are
typed using SI (International System of Units) standards; numbers
with more than four digits are placed in groups of three, separated by a
GETTING STARTED 1-3