EXFO FTB-500 - Manual (Page 370)

IEEE 488.2 and Specific Command Reference
362 FTB-500
IEEE 488.2 Required Commands
*OPC?
Description The *OPC? query makes possible the
synchronization between the instrument and an
external controller by reading the Output Queue
or by waiting for a service request on the
Message Available (MAV) bit in the Status Byte
Register. The *OPC? query causes the instrument
to place an ASCII character, 1, into its Output
Queue when the device completes all pending
operations. A consequence of this action is that
the MAV bit in the Status Byte Register is set to
state 1.
Syntax *OPC?
Parameter(s) None
Response Syntax
Response(s) Acknowledge:
The response data syntax for is
defined as a
element.
The response is a single
ASCII-encoded byte corresponding to 1.
The receipt of an response
indicates that all pending selected device
operations have been completed.
Example(s) *OPC? returns 1
See Also *OPC
*WAI