Model 2651A High Power System SourceMeter® Instrument Reference Manual
Section 7: Command reference
2651A-901-01 Rev. A / March 2011
7-265
Bit Value
Description
B0
status.MEASUREMENT_SUMMARY_BIT
status.MSB
Set summary bit indicates that an enabled measurement
event has occurred.
Bit B0 decimal value: 1
B1 Not
used
Not applicable
B2
status.ERROR_AVAILABLE
status.EAV
Set summary bit indicates that an error or status message
is present in the Error Queue.
Bit B2 decimal value: 4
B3
status.QUESTIONABLE_SUMMARY_BIT
status.QSB
Set summary bit indicates that an enabled questionable
event has occurred.
Bit B3 decimal value: 8
B4
status.MESSAGE_AVAILABLE
status.MAV
Set summary bit indicates that a response message is
present in the Output Queue.
Bit B4 decimal value: 16
B5
status.EVENT_SUMMARY_BIT
status.ESB
Set summary bit indicates that an enabled standard event
has occurred.
Bit B5 decimal value: 32
B6
status.MASTER_SUMMARY_STATUS
status.MSS
Set bit indicates that an enabled Master Summary Status
(MSS) bit of the Status Byte register is set.
Bit B6 decimal value: 64
B7
status.OPERATION_SUMMARY_BIT
status.OSB
Set summary bit indicates that an enabled operation event
has occurred.
Bit B7 decimal value: 128
In addition to the above constants,
nodeEventRegister
can be set to the decimal equivalent of the bit(s) set.
When more than one bit of the register is set,
nodeEventRegister
contains the sum of their decimal weights.
For example, if 129 is returned, bits B0 and B7 are set (1 + 128).
Bit
B7 B6 B5 B4 B3 B2 B1 B0
Binary
value
0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1
Decimal
128 64 32 16 8 4 2 1
Weights (2
7
) (2
6
) (2
5
) (2
4
) (2
3
) (2
2
) (2
1
) (2
0
)
Example
nodeEventRegister = status.node_event
print(nodeEventRegister)
Reads the status node event register.
Sample output:
1.02
Converting this output (129) to its binary
equivalent yields: 1000 0001
Therefore, this output indicates that the set bits
of the status byte condition register are presently
B0 (MSB) and B7 (OSB).
Also see
(on page 7-314)
Status byte and service request (SRQ)
