Technical data

6 IEEE-488.2 Common Commands
38 U2751A Programmer’s Reference Guide
*OPC/*OPC?
Syntax
*OPC
The command is mainly used for program synchronization. It causes the
instrument to set the OPC bit (bit 0) of the Standard Event Status register
when the instrument has completed all pending operation sent before the
*OPC command.
*OPC?
This query returns "1" to the output buffer at the completion of all the
pending operation. *OPC? command does not suspend processing of
commands.
Remarks
• Please take note of the difference between *OPC and *OPC?.
• Pending operation have completed when:
• all commands sent before *OPC have completed. Commands are
executed sequentially (the execution of a command has to be
completed before the next one is being executed)
• all triggered actions have completed
• *OPC does not prevent the processing of subsequent commands,
however, the OPC bit will not be set until all pending operation have
completed.
Returned Query Format
<NR1>
The command returns "1" to the output buffer.
NOTE
For more information on the system registers, refer to Chapter 2, “SCPI Status
Registers” on page 9.