Model 2110 5½ Digit Multimeter Reference Manual
Appendix B: Status model
2110-901-01 Rev. C/August 2013
B-9
Standard Event Register
Bit
Definition
Decimal
value
Description
0
Operation Complete
1
Set bit indicates that all pending selected device operations are
completed and the instrument is ready to accept new
commands. This bit only sets in response to the *OPC
command. See
*OPC — operation complete command
5-6) and
*OPC? — operation complete query
(on page 5-6) for
details.
1
Not used.
2
Set to 0.
2
Query Error (QYE)
4
Set bit indicates that you attempted to read data from an empty
Output Buffer; a new command line was received before a
previous query was read; or both the input and Output Buffers
are full.
3
Device-Dependent
Error (DDE)
8
Set bit indicates that an instrument operation did not execute
properly due to some internal condition.
4
Execution Error
(EXE)
16
Set bit indicates that the instrument detected an error while trying
to execute a command.
5
Command Error
(CME)
32
Set bit indicates that a command error has occurred. Command
errors include:
•
IEEE-488.2 syntax error — instrument received a
message that does not follow the defined syntax of the
IEEE-488.2 standard.
•
Semantic error — instrument received a command that
was misspelled or received an optional IEEE-488.2
command that is not implemented.
•
The instrument received a Group Execute Trigger (GET)
inside a program message.
6
Not used.
64
Set to 0.
7
Power ON (PON)
128
Set bit indicates that the instrument has been turned off and
turned back on since the last time this register has been turned
off.
Monitor the contents of the Output Buffer by using *OPC
The *OPC command causes the instrument to set the Operation Complete Bit (OPC) after all pending
operations are complete.
The *OPC? operation complete query places an ASCII “1” in Output Buffer after all pending
instrument operations are complete.
Typically, either one of these commands is sent after the INITiate command. The INITiate command
is used to take the instrument out of idle in order to perform measurements.
•
After the instrument completes all programmed commands, the instrument returns to the idle
state. Then the instrument completes all pending commands including:
•
*OPC command. Completing this command sets the OPC bit
•
*OPC? command. Completing this command places an ASCII “1” in Output Buffer
If there are too many messages in the Output Buffer before the *OPC command is sent, the buffer
cannot accept any additional messages and the instrument will stop taking readings.
