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Model
8902A
Tahk 3-9. SRQ Mask and Statirs Byte Bif Dt>scriDtion.s
Operation
Bit
Number
0
1
2
3
4
5
6
7
Mask
Weight
1
2
4
8
16
32
Condition
Data Ready
HP-I6 Code Error
(Permanently Set)
Instrument Error
Limit Exceeded
Frequency Offset Mode Change
Recalibrate or 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)
and
exceeded
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 RECAL or UNCAL annun-
ciators turn on.
This bit will always be set if any of the other bits are set.
Alwavs
0.
Reading the SRQ Mask
Read the
SRQ
Mask by entering
22.64SP.
This
initiates a "measurement"
of
the mask value which
i s 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
t h i s
w i l l not clear the
HP-IB
Code
Error bit.)
0
Sending the Device Clear ( D C L ) message, sending Instrument
Preset
(IP)
or powering up
the
instrument
.
3-3
1
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