B&K Precision MDL Series - Programming Manual - Manual (Page 26)

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*OPC This sets the OPC status bit when all pending operations have completed. Since your
program can read this status bit on an interrupt basis, *OPC allows subsequent commands
to be executed.
NOTE: The trigger system must be in the Idle state in order for the status OPC bit to be true. Therefore,
as far as triggers are concerned, OPC is false whenever the trigger system is in the Initiated state.
Using Device Clear
You can send a device clear at any time to abort a SCPI command that may be hanging up the GPIB
interface. The status registers, error queue, and all configuration states are left unchanged when a
device clear message is received. Device clear performs the following actions:
• The input and output buffers of the electronic load are cleared.
• The electronic load is prepared to accept a new command string.
The following statement shows how to send a device clear over the GPIB interface using GW BASIC:
CLEAR 705 IEEE-488 Device Clear
The following statement shows how to send a device clear over the GPIB interface using the GPIB
command library for C or QuickBASIC:
IOCLEAR (705)