Keithley 2651A, Справочное руководство, Страница: 619 / 800

Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 7: Command reference
2651A-901-01 Rev. A / March 2011 7-311
For information about .condition, .enable, .event, .ntr, and .ptr registers, refer to Status register sets (on page E-
2) and Enable and transition registers (on page E-18). The individual bits of this register have the following
meanings:
Bit Value Description
B0
status.MEASUREMENT_SUMMARY_BIT
status.MSB
Set summary bit indicates that an enabled event in the
Measurement Event Register has occurred.
Bit B0 decimal value: 1
B1
status.SYSTEM_SUMMARY_BIT
status.SSB
Set summary bit indicates that an enabled event in the
System Summary Register has occurred.
Bit B1 decimal value: 2
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 event in the
Questionable Status Register 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 event in the
Standard Event Status Register has occurred.
Bit B5 decimal value: 32
B6 Not used. Not applicable.
B7
status.OPERATION_SUMMARY_BIT
status.OSB
Set summary bit indicates that an enabled event in the
Operation Status Register has occurred.
Bit B7 decimal value: 128
In addition to the above constants,
requestEventRegister
can be set to the decimal equivalent of the bit(s)
set. When more than one bit of the register is set,
requestEventRegister
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
requestEventRegister = status.request_event
print(requestEventRegister)
Reads the status request 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 request event register are presently
B0 (MSB) and B7 (OSB).
Also see
status.condition (on page 7-250)
status.system.* (on page 7-314)
Status model overview (on page E-4)
Status byte and service request (SRQ) (on page E-14)