HP 8901B Operation And Calibration Manual page 147

Operation
Definitions of the SRQ Mask and
- - -
- -
-
- -
- - - -
-
Status Byte bits
Model 8901B
FREQUENCY
INSTRUMENT
"-I8
D A T A
READY
L I M I T
CODE
EXCEEDED
ERROR ERROR
UNCALIBRATEO
oiL:ET
CHANGE
SRQ MASK
1
User sets to
1
to unmask condition
using Special Function 22. HP-IB
Code Error bit
IS
permanently
--------------
unmasked
STATUS
BYTE
0
1
if
condition has occurred and
-
SRQ Mask bit has been set to
1
I
I
RQS B I T
I
1 if
one or more other Status Byte
bits are
1.
- - -
-
-
-c
I f l
Asserted
if
RQS bit is
1
SERVICE REQUEST MESSAGE
(SRQ
BUS L I N E )
SRQ ANNUNCIATOR
ON FRONT PANNEL
p q
On
if
SRQ line is asserted and front
- - - - - - -
+
panel display is updated.
Figure
3-4.
Issuing
a
Service Request
3-28