Keithley 2657A, Reference Manual, Page: 562 / 805

Model 2657A High Power System SourceMeter® Instrument Reference Manual Section 7: TSP command reference
2657A-901-01 Rev. B/December 2012 7-249
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 measurement
event has occurred.
Bit B0 decimal value: 1
B1 status.SYSTEM_SUMMARY_BIT
status.SSB
Set summary bit indicates that an enabled system event
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 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
Request Service (RQS)/Master Summary Status (MSS).
Depending on how it is used, bit B6 of the status byte
register is either the Request for Service (RQS) bit or
the Master Summary Status (MSS) bit:
•
When using the GPIB or VXI-11 serial poll
sequence of the Model 2657A to obtain the
status byte (serial poll byte), B6 is the RQS bit.
The set bit indicates that the Request Service
(RQS) bit of the status byte (serial poll byte) is
set and a serial poll (SRQ) has occurred.
•
When using the
status.condition
register
command or the *STB? common command to
read the status byte, B6 is the MSS bit. Set bit
indicates that an enabled summary 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, when more than one bit of the register is set,
statusByte
equals 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
statusByte = status.condition
print(statusByte) Returns
statusByte
.
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
(MSS) and B7 (OSB).