HP 8901B

Operation
Definitions of the SRQ Mask and - - - - - - - - - - - - -
Status Byte bits
Model 8901B
FREQUENCY
INSTRUMENT "-I8 DATA
READY
LIMIT 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 BIT I
1 if one or more other Status Byte
bits are
1.
- - - - - -c I fl
Asserted if RQS bit is 1
SERVICE REQUEST MESSAGE
(SRQ BUS LINE)
SRQ ANNUNCIATOR
ON FRONT PANNEL
pq
On if SRQ line is asserted and front - - - - - - - +
panel display is updated.
Figure 3-4. Issuing a Service Request
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