IEEE 488.2 Command Reference 17
N1911A/1912A P-Series Power Meters Programming Guide 753
*STB?
The *STB? (STatus Byte) query returns bit 0 to 5 and bit 7 of the power
meter’s status byte and returns the Master Summary Status (MSS) as
bit 6. The MSS is the inclusive OR of the bitwise combination (excluding
bit 6) of the Status Byte and the Service Request Enable registers. The
format of the return is <NR1> in the ranges of 0 to 255. Table 17- 93
shows the contents of this register. Refer to the Status Block Diagram at
the end of Chapter 11 for further information.
Tab le 17-93 *STB? Mapping
Bit Weight Meaning
0 1 Not used
1 2 Device Dependent
0 - No device status conditions have occurred
1 - A device status condition has occurred
2 4 Error/Event Queue
0 - Queue empty
1 - Queue not empty
3 8 Questionable Status Summary
0 - No QUEStionable status conditions have occurred
1 - A QUEStionable status condition has occurred
4 16 Message Available
0 - no output messages are ready
1 - an output message is ready
5 32 Event Status Bit
0 - no event status conditions have occurred
1 - an event status condition has occurred
6 64 Master Summary Status
0 - power meter not requesting service
1 - there is at least one reason for requesting service
7 128 Operation Status Summary
0 - No OPERation status conditions have occurred
1 - An OPERation status condition has occurred
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