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Programming
Monitoring the Instrument
Table 4-8. Bits in Questionable Status Register
Bit
Definition
0, 1, and 2
not used
3
POWer - indicating that the instrument is measuring too high of a
power.
4 through 8
not used
9
Maximum signals - indicating that the instrument has found the
maximum number of signals.
10
Drift Reference - indicating that the number of reference signals is
different from the current number of input signals.
11
Delta Reference - indicating that there is no delta reference signal.
12 through 13
not used
14
Command Warning - indicating that the instrument has received
some extra unexpected parameters for one of the measurement
functions.
15
not used
The contents of the Standard Event Status Register can be read and the register
cleared by sending the *ESR? query. The value returned is the total bit weights of all
of the bits that are set at the present time.
Enabling register bits with masks
Several masks are available which you can use to enable or disable individual bits in
each register. For example, you can disable the Hardcopy bit in the OPERation Sta-
tus Register so that even though it goes high, it can never set the summary bit in the
status byte high.
Use the *SRE common command to set or query the mask for the Status Byte Reg-
ister.
The masks for the OPERation Status and QUEStionable Status registers are set and
queried using the STATus subsystem's ENABle commands.
Use the *ESE common command to set or query the mask for the Standard Event
Status Register.
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