Syntax Syntax; Diagrams - HP 54501A Programming Reference Manual

Syntax
Diagrams
The
syntax diagrams in this chapter are similar to
the
syntax
diagrams in
the
IEEE 488.2 specification. Commands and queries are
sent to the
instrument
as a sequence
of
data bytes. The allowable byte sequence for
each functional
element
is defined
by
the
syntax
diagram that
is
shown
with
the element description.
The
allowable byte
sequence can
be determined
by following
a
path
in
the
syntax
diagram. The proper path through the
syntax
diagram
is
any
path
that follows the direction
of the arrows.
If
there
is
a
path around
an
element, that element
is optional.
If
there
is
a
path
from
right to left
around
one or
more elements, that element or those elements may be
repeated
as
many times
as
desired.
Syntax
Overview
This overview is
intended to give
a
quick glance
at the syntax defined
by
IEEE
488.2.
It
should allow
you
to understand many
of
the things about
the syntax you
need to know. This chapter
also
contains the details of the
IEEE
488.2
defined
syntax.
IEEE 488.2 defines the blocks used to build messages which are
sent
to
the instrument.
A whole string
of
commands can therefore be broken up
into individual components.
HP 54501A
Programming
Message Communication and System Functions
3-5