Agilent Technologies 8504B - Page 140

FINAL TRIM SIZE : 7.5 in x 9.0 in
Programming
IEEE 488.2
Common
Commands
*CLS
Clears
the
status
byte,
the event
status register
,
and
the
event
status
register
B
.
Syntax:
*CLS
*ESE
Enables
specic
bits
of
event status
register.
Query
Syntax: *ESE{?|<value>}
Item Description
value 0
to
32767
(2
15-1
)
*ESR?
Returns
the
contents of
the
standard
event
status
register
.
Syntax: *ESR?
*IDN?
Outputs
the
identication
string,
\HEWLETT
P
A
CKARD
,
HP
8504B
,0,X.XX",
where
X.XX
is
the
rmware
revision.
Syntax:
*IDN?
*OPC
T
ells
the
reectometer
to
set
bit
0,
(OP
eration
Complete
bit),
in
the
event
status
register
when
it
completes
all
pending
operations
.
When
used
in
Query
form,
the
reectometer
will
output
a
1
when
the
operation
is
complete
.
Its
use
is
enabled
by
issuing
the
command
OPC;
or
OPC?;
prior
to
an
OPC'able
command.
F
or
example
,
issuing
OPC;SING;
causes the
OPC bit
in
to
be
set
at
the
completion
of
the
single sweep
. Issuing
OPC?; instead
causes
the
reectometer
to
output
a
1
when
the
sweep is
completed. A
ddressing the
reectometer
to
talk
will
then
hold
HP-IB
trac
until the
sweep is
completed
and
the
\1"
has
been
accepted.
Syntax: *OPC
*PCB
Sets the HP-IB address which the reectometer uses to communicate
with an
external controller
.
Syntax: *PCB{?|<value>}
4-13
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