B&K Precision 2552-2559 - Programming Manual - Manual (Page 73)

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DESCRIPTION The *OPC (OPeration Complete) command
sets to true the OPC bit (bit 0) in the standard
Event Status Register (ESR). This command
has no other effect on the operation of the
oscilloscope because the instrument starts
parsing a command or query only after it has
completely processed the previous command
or query.
The *OPC? query always responds with the
ASCII character “1” because the oscilloscope
only responds to the query when the previous
command has been entirely executed.
COMMAND SYNTAX
*OPC
QUERY SYNTAX
*OPC?
RESPONSE FORMAT *OPC 1
STATUS *OPC
Command /Query