HP 54501A - Command Structure; Common Commands; Root Level Commands; Subsystem Commands

Command
Structure
The
HP
54501A
programming
commands
are
divided
into
three types:
common
commands, root
level
commands,
and
subsystem
commands.
A
programming
command tree
is
shown
in
figure
4-1.
Common
The
common
commands
are
the
commands
defined by
IEEE
488.2.
Commands
These
commands
control
some
functions
that
are
common
to
all
IEEE
488.2
instruments.
Sending
the
common
commands
do
not
take the
instrument out
of
a
selected
subsystem.
ROOt L6Vel
The
root
level
commands
control
many
of
the
basic
functions
of
the
Commands
instrument.
Subsystem
There
are
several
subsystems in
this
instrument.
Only
one
subsystem
may
Commands
be selected at
any
given
time.
At
power
on,
the
command
parser
is
set
to
the
root
of
the
command
tree,
therefore
no
subsystem
is
selected.
Note
When
a
program message
terminator
or
a
leading
colon
(:)
is
sent
in
a
program
message,
the
command
parser
is
returned
to
the
root
of
the
command
tree
HP
54501A
Programming
Programming
and
Documentation Conventions
4-9