HP 8901B

Operation
Model 8901B
Table 3-9. SRQ Mask 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 the following operations:
0 Entering 22.0SP (Remember this will not clear the HP-IB Code Error bit.)
0 Sending the Device Clear (DCL) message, sending Instrument Preset (IP) or powering up the
instrument.
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