Agilent Technologies 8504B - Page 136

FINAL TRIM SIZE : 7.5 in x 9.0 in
Monitoring
the
Instrument
The
following gures
show
the
instrument's
status
reporting
registers
.
These
registers
allow you
to
monitor
the
instrument's
operating
condition
during
a
program.
Use the
*STB?
common
command
to
read
the
status
byte
.
(
*CLS
clears
the status
byte;
*SRE
enables
status-byte
bits
.)
Use
the
*ESR?
common
command
to read
the
standard
event
status
register
.
Refer
to
\IEEE
488.2
Common
Commands"
in
this
chapter
for
information
on
common
commands
.
Status Byte
Bit
Denitions
Bit Name Description
2 Check event
status register
B
One of
the enabled
bits in
event
status
register
B
has
been
set.
3 Message
in
error
queue
An
error
has
occurred
and
the
message
has
been
placed
in
the
error
queue,
but has
not
been
read
yet.
4 Message
in
output
queue
A
command
has
prepared
information
to
be
output,
but
it
has
not
been read
yet.
5 Check
event
status
register
One
of
the
enabled
bits
in
the
event
status
register
has
been
set.
6 Request
service
One
of
the
enabled
status
byte
bits
is
causing
an
SRQ.
4-9
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