HP 54501A - Device Talking

Device
Talking Syntax
The
talking
syntax
of
IEEE
4882
is
designed
to
be
more
precise
than
the
listening
syntax.
This
allows
the
programmer
to
write
routines
which
can
more
easily interpret
and
use
the
data
the
instrument
is
sending.
One
of
the
implications
of
this
is
the
absence
of
<
white
space
>
in
the
talking
formats.
The
instrument
will
not
pad
messages
which
are
being
sent to
the
controller
with
spaces.
<
response message
>.
This
element
serves
as
a complete
response
from
the
instrument.
It
is
the
result of
the
instrument
executing
and
buffering
the
results
from
a
complete
<
program
message
>.
The
complete
<
response
message
>
should
be
read
before
sending
another
<
program
message
>
to
the
instrument.
Figure
3-20.
<
response message
>
<
response
message
unit
>.
This
element serves
as
the
container
of
individual
pieces
of
a
response.
Typically
a
<
query
message
unit
>
will
generate
one
<
response
message
unit
>,
although
a
<
query
message
unit
>
may
generate
multiple <
response message
unit
>
s.
<
response
header
>.
The
<
response
header
>,
when
returned,
indicates
what
the
response
data
represents.
HP
54501A
Programming
Message
Communication
and System
Functions
3-21