Rigol DS1204B Programming Manual page 13

9. *OPC?
Command Format:
*OPC?
Function:
The command queries whether the command operation has been completed.
Return Format:
The query returns 0 or 1. 1 means operation has been completed, 0 means not.
10. :SINGLE
Command Format:
:SINGLE
Function:
The command sets the trigger mode as Single trigger, means that collect a
waveform when detect a trigger signal, then stop running.
Programming Guide for DS1000B Series
RIGOL
2-5