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SCPI Command Reference
Tunable Laser Source
75
General Commands
*OPC
Description This command makes synchronization between the instrument
and an external controller possible. The *OPC command causes
the instrument to set bit 0 (Operation Complete) in the Standard
Event Status Register to the TRUE (logic 1) state when the
instrument completes all pending operations.
Detection of the Operation Complete message can be
accomplished by continuous polling of the Standard Event Status
Register using the *ESR? common query command. However,
using a service request eliminates the need to poll the Standard
Event Status Register thereby freeing the controller to do other
useful work.
Type Overlapping.
Syntax *OPC
Parameter(s) None.
See Also
*OPC? on page 75
*WAI
on page 79
*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.
Type Overlapping.
Syntax
*OPC?
Parameter(s) None.
Response Syntax
<Acknowledge>
Response(s) Acknowledge:
The <Acknowledge> response is a single ASCII-encoded byte
corresponding to 1.
The receipt of an <Acknowledge> response indicates that all
pending selected device operations have been completed.
Example(s)
*OPC? returns 1
See Also *OPC on page 75
*WAI on page 79