Keithley 2461 Reference Manual page 1040

Appendix B: Common commands
*ESR?
This command reads and clears the contents of the Standard Event Status Register.
Type
Query only
Usage
*ESR?
Details
The instrument returns a decimal value that corresponds to the binary-weighted sum of all bits set in
the register.
Decimal
Bit value
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Command errors include:
• IEEE Std 488.2 syntax error: The instrument received a message that does not follow the defined
syntax of the IEEE Std 488.2 standard.
• Semantic error: The instrument received a command that was misspelled or received an optional IEEE
Std 488.2 command that is not implemented in the instrument.
• GET error: The instrument received a Group Execute Trigger (GET) inside a program message.
Example
*ESR?
Also see
Status model
B-4
Affected by
Not applicable
Constant
status.standard.OPC
Not used
status.standard.QYE
Not used
Not used
Not used
Not used
status.standard.PON
Example output:
128
Shows that the Standard Event Status Register contains binary
10000000, which indicates that the instrument was rebooted since the
last time this register was read.
(on page C-1)
Model 2461 Interactive SourceMeter® Instrument Reference Manual
Where saved
Not applicable
When set, indicates the following has occurred:
All pending selected instrument operations are
complete and the instrument is ready to accept new
commands. The bit is set in response to an
(on page B-6) command or TSP
92) function.
Not used.
Attempt to read data from an empty Output Queue.
Not used.
Not used.
Not used.
Not used.
The instrument has been turned off and turned back
on since the last time this register was read.
Default value
Not applicable
*OPC
opc() (on page 8-
2461-901-01 A/November 2015