Exfo FTB-500 (Window XP) Manual do Utilizador descarregar pdf (Página 396)

IEEE 488.2 and Specific Command Reference

388 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 <Acknowledge>

Response(s) Acknowledge:

The response data syntax for <Acknowledge> is

defined as a <NR1 NUMERIC RESPONSE DATA>

element.

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

*WAI

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