HP 54501A Programming Reference Manual page 37

Multiple Queries
You
can send
multiple queries to
the instrument within
a
single program
message,
but you must
also read
them back within
a
single program
message.
This
can be
accomplished by either reading them back into
a
string variable or
into multiple
numeric variables. For example, you could
read
the result of the
query
:TIMEBASE:RANGE?;DELAY?
into the
string variable Results$ with the command:
ENTER 707;Results$
When you read the result
of multiple queries
into string variables, each
response is separated by
a
semicolon.
For example, the
response
of
the
query
:TIMEBASE:RANGE?;DELAY?
with
HEADER
and
LONGFORM
on would be:
:TIMEBASE:RANGE
<range_setting>;:TIMEBASE:DELAY <delay_setting>
If
you do not need to see the headers when the numeric
values are
returned,
then you could use
following program
message
to read the query
:TIMEBASE:RANGE?;DELAY? into multiple
numeric variables:
ENTER
707;Resultl,Result2
Note
Instrument Status
When you
are receiving numeric data into numeric variables,
the
headers should be turned
off.
Otherwise the headers
may cause
misinterpretation of
returned data.
Status registers
track
the
current
status
of
the instrument. By checking
the
instrument
status, you can find
out whether
an
operation
has
been
completed, whether the instrument is receiving triggers, and more. The
chapter "Message Communication and
System Functions" explains how to
check the
status
of the instrument.
HP
54501A
Programming
Introduction to Programming an Oscilloscope
1-19