Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 190)

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O:\Manuals\E6380A_Progguid\Book\Advoper.fm

Advanced Operations

Passing Control

Requesting Control using IBASIC

The Test Set has the capability to request control of the bus from the

Active Controller from a running IBASIC program using the IBASIC

command EXECUTE ("REQUEST_CONTROL"). When the EXECUTE

("REQUEST_CONTROL") command is executed from a running

IBASIC program, the Request Control bit, bit 1, of the Test Set’s

Standard Event Status Register is set to the TRUE, logic 1, condition.

The Active Controller detects the request in the Test Set’s Standard

Event Status Register either as a result of an SRQ indication by the

Test Set or by some polling routine which periodically checks bit 1 of the

Standard Event Status Register of all potential controllers on the bus.

The Active Controller would then send the Test Set the address to

which the Test Set is to later pass control using the *PCB Common

Command. The Active Controller would then pass control to the Test

Set.

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