HP 54501A - Response Header Options

Response
Header
The
format
of
the
returned
ASCII
string
depends
on
the
current
settings
Options
of
the
SYSTEM
HEADER and
LONGFORM
commands.
The
general
format
is:
<
header
>
<
separator
>
<data>
<
terminator
>
The
header
identifies
the data
that
follows and
is
controlled
by
issuing
a
:SYSTEM:HEADER
ON/OFF
command.
If
the
state
of
the
header
command
is
OFF,
only
the
data
is
returned
by
the
query.
The
format
of
the
header
is
controlled
by the
:SYSTEM:LONGFORM ON/OFF
command.
If
longform
is
OFF,
the
header
will
be
in
its
shortform
and
the
header
will
vary
in
length depending
on
the
particular
query.
The
following
would
be
returned
from
a
:MEASURE:FREQUENCY?
frequency
measurement
query:
<
data
>
<
terminator
> (with
HEADER
OFF)
:MEAS:FREQ
<
separator
> <
data
> <
terminator
> (with
HEADER ON/LONGFORM OFF)
:MEASURE:FREQUENCY
<
separator
>
<
data
> <
terminator
> (with
HEADER
ON/LONGFORM
ON)
Note
A
command or
query
may
be
sent
in either
longform
or
shortform,
or
in
any
combination
of
longform
and
shortform.
The
HEADER
and
LONGFORM
commands
only
control
the
format
of the
returned data and
have
no
effect
on
the
way
commands
are
sent. Common
commands never return
a
header.
Refer
to
the
chapter
"System
Subsystem"
for
information
on
turning
the
HEADER and
LONGFORM
commands
on
and
off.
Introduction
to
Programming
an
Oscilloscope
HP
54501A
1-14
Programming