HP 8901B Operation And Calibration Manual page 149

Operation
Model 8901B
Table 3-9. SRQ
M a s k
and Status Byte Bit Descriptions
Bit
Number
0
-
1
2
3
4
5
6
7
Mask
Weight
1
2
4
8
16
32
Condition
Data Ready
HP-IB Code Error
(Permanently Set)
Instrument Error
Limit Exceeded
Frequency Offset Mode Change
Uncalibrated
RQS
(Request Service)
Unused
Description
Asserted if unmasked when valid data is ready after a
measurement. This can be used for any function which
outputs to the bus.
Asserted when an invalid code is sent to the bus, or an
error is made in programming the instrument. (Always
unmasked
.)
Asserted if unmasked when an error is displayed on the
instrument. Note that invalid bus codes are also instrument
errors
Asserted
if
unmasked when limits are enabled (14.XSP)
andexceeded
Asserted if unmasked when in Frequency Offset Mode and
Manual Tune frequency is changed, or when entering or
exiting the mode through 27.0/1/3 SPCL.
Asserted if unmasked when the UNCAL annuniciator turns
on.
This bit will always be set if any of the other bits are set.
Always 0.
Reading the
SRQ
Mask. Read the SRQ Mask
by
entering
22.64SP.
This initiates a "measurement"
of the mask value which is displayed
and
available over the bus. This value will
be
displayed in decimal
and
can be interpreted using Table 3-9
"SRQ
Mask
and
Status
Byte Bit
Descriptions".
Clearing the
SRQ
Mask. Clear the
SRQ
Mask by any of t h e following operations:
0
Entering
22.0SP
(Remember this will not clear the
HP-IB
Code Error
bit.)
0
Sending
t h e Device Clear
(DCL)
message, sending Instrument Preset (IP)
or
powering up the
instrument.
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