Device Talking - HP 54501A Programming Reference Manual

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