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188 Chapter 6

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

Advanced Operations

Passing Control

Passing Control to the Test Set

Control is passed to the Test Set when it is addressed to TALK and then

receives the Take Control Talker (TCT) command. The programming or

controller command which implements the pass control protocol as

outlined in the IEEE 488.1 and 488.2 Standards is language/controller

specific. Refer to the appropriate language/controller documentation for

specific implementations.

Before passing control to the Test Set the Active Controller should send

the Test Set the address to use when passing control back. This is

accomplished using the *PCB Common Command. The *PCB command

tells the Test Set which address should be used when passing control

back to another bus controller. Before passing bus control to the Test

Set, the currently active controller can use the *PCB command to tell

the Test Set where to send the Take Control (TCT) command when the

Test Set is ready to give up active control of the bus. The command is

followed by a number which contains the bus address of the device that

should become the next active controller. The number must round to an

integer in the range 0 to 30 decimal. The command may be followed by

two numbers. The first will be used as the primary address, the second

as the secondary address of the next active controller.

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Agilent Technologies 8935 Series Uživatelský manuál Strana 188