IEEE 488.2 Command Reference 13
U2000 Series Programming Guide 309
*STB?
The *STB? (STatus Byte) query returns bit 0 to 5 and bit 7 of the power
sensor’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 13- 4 shows the contents of this
register. Refer to the Status Block Diagram at the end of Chapter 9, “STATus
Subsystem” for further information.
Tab le 13-4 *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 sensor 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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