Keithley 2182 User Manual page 212

12-8 Common Commands
*OPC – Operation Complete
Description
After the *OPC command is sent, the Operation Complete bit (bit B0) of the Standard Event
Status Register will set immediately after the last pending command is completed. If the
corresponding bit (bit B0) in the Standard Event Enable Register and Bit 5 (Event Summary Bit)
of the Service Request Enable Register is set, the RQS/MSS (Request for Service/Master
Summary Status) bit in the Status Byte Register will set.
When used with the immediate initiation command (:INITiate), the OPC bit in the Standard
Event Status Register will not set until the Model 2182 goes back into the idle state. The :INIT
command operation is not considered finished until the Model 2182 goes back into the idle state.
See the description for *WAI for more information on command execution.
When used with the *TRG command, the OPC bit will not set until the operations associated
with the *TRG command (and the initiate command) are finished. The *TRG command is
considered to be finished when the Device Action completes or when operation stops a control
source to wait for an event (see
To use the *OPC exclusively with the *TRG command, first force the completion of the
initiate command so that only the *TRG command is pending. Do this by sending the :ABORt
command to place the instrument in idle, which (by definition) completes the initiate command.
Since continuous initiation is on, operation continues into the Trigger Model. After sending the
*TRG command, the OPC bit sets when the *TRG command is finished.
Set the OPC bit in the standard event register after
all pending commands are complete
"Trigger model," in Section 7).