Keithley 2461 Reference Manual page 895

Section 8: TSP command reference
Details
You can use this command to read the status byte, which is returned as a numeric value.
When an enabled status event occurs, a summary bit is set in this register to indicate the event
occurrence. The returned value can indicate that one or more status events occurred. If 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). See
additional information about reading bit values.
If you are using the GPIB, USB, or VXI-11 serial poll sequence of the Model 2461 to get the status
byte (also called a serial poll byte), B6 is the Request for Service (RQS) bit. If the bit is set, it
indicates that a serial poll (SRQ) has occurred. For additional detail, see
page C-14)
The meanings of the individual bits of this register are shown in the following table.
Bit Decimal
value
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Example
statusByte = status.condition
print(statusByte)
Also see
None
8-222
Model 2461 Interactive SourceMeter® Instrument Reference Manual
Constant
status.MSB
Not used
status.EAV
status.QSB
status.MAV
status.ESB
status.MSS
status.OSB
Understanding bit settings
When set, indicates the following has occurred:
An enabled measurement event
An error or status message is present in the Error Queue
An enabled questionable event
A response message is present in the Output Queue
An enabled standard event
An enabled summary bit of the status byte register is set
An enabled operation event
Returns statusByte.
Example output:
1.29000e+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).
(on page C-16) for
Serial polling and SRQ (on
2461-901-01 A/November 2015