Operation Model 8904A
3-6.
REMOTE
OPERATION
General Information
The Hewlett-Packard Interface Bus (HP-IB)
is
an IEEE-488 compatible
digital
remote control system
used for controlling up
to
15
different instruments at one time.
It
uses
common
TTL
level
signals
for
8
data
lines and
8
interface and communication management lines.
A
description of the HP-IB connector
is provided
at
the end of Section
2
of this manual.
The HP 8904A Multifunction Synthesizer can be remotely controlled
via
the HP-IB
to
perform any
function
that
can be done with the front panel keys; with the exception of turning line power on or
off
and reading or setting the
HP-IB
address.
The HP-IB address
is
read and changed by using the
ADRS
key. Valid addresses
are
00
to
30.
Tutorial
0
Tutorial Description
of
the Hewlett-Packard Interface
Bus
(HP part number
5952-0156)
This
very helpful guide explains the capabilities and specifications for understanding and using HP-IB
control. Hardware setup, interface circuitry, and programming are discussed in detail.
It
is
written
to
both the experienced
and
inexperienced user.
Programming Considerations
0
HP-IB programs examples in
this
manual are written in HP BASIC language.
0
This manual
is
not intended
to
teach BASIC language programming. The tables and programming
examples
that
follow assume
that
you have enough programming experience
to
understand and
apply the information given
in
them.
0
Some parameters must be specified before others; such
as
specifying the correct destination for a
signal before setting
its
amplitude, and entering the proper mode for the type of signal you need
before attempting
to
set any signal parameters in
that
mode.
0
The front panel display only changes
to
show
what
mode the instrument
is
in when changing
parameters remotely. The different parameters
that
can be changed are not shown
as
they are
being altered.
To
be able
to
view the parameter changes during HP-IB operation,
you
must
manually select the menu that shows the parameters you want
to
look
at before sending the
HP-IB commands.
3-18
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