HP 54501A - Sequential and Overlapped Commands; Response; Notation Conventions and Definitions; Generation

Sequential
and
Overlapped
Commands.
IEEE 488.2
makes
the distinction
between
sequential
and
overlapped
commands.
Sequential
commands
finish
their task
before
the
execution
of
the
next command starts. Overlapped commands
run concurrently,
and
therefore
the
command
following
an
overlapped
command
may
be
started
before
the
overlapped
command
is
completed.
All
the
commands
of the
HP
54501A
are
sequential.
Response
Generation
IEEE
488.2
defines
two
times at
which
query
responses
may
be
buffered.
The first
is
when
the
query
is
parsed by
the
instrument,
the
second
is
when
the
controller
addresses
the
instrument to
talk
so
that
it
may
read
the
response.
The
HP
54501A
will
buffer
responses
to
a
query
when
the
query
is
parsed.
Notation
Conventions
and
Definitions
The
following
conventions
are
used
in
this
manual
in
descriptions
of
remote
(HP-IB)
operation:
< >
Angular
brackets
enclose words
or
characters
that
are
used to
symbolize
a
program
code
parameter or
an HP-IB
command.
::
=
"is
defined
as."
For
example,
<A>::=
<B>
indicates
that
<
A
>
can
be
replaced
by
<
B
>
in
any
statement
containing
< A
>.
|
"or." Indicates
a
choice
of
one
element from
a
list.
For
example,
< A >
|
<
B
>
indicates
< A >
or
<
B
>
but
not
both.
...
An
ellipsis
(trailing dots)
is
used
to
indicate that the
preceding
element
may
be
repeated one
or more
times.
[ ] Square
brackets
indicate
that the
enclosed
items
are
optional.
{ }
When several
items
are
enclosed
by
braces,
one,
and
only
one
of these
elements
must
be
selected.
HP
54501A
Programming
Programming
and Documentation
Conventions
4-7