Agilent Technologies 54645A Manual de Instruções descarregar pdf (Página 41)

Lockout

You can use the SYSTem:LOCK ON command to disable front-panel control

while a program is running. By default, the instrument accepts and executes

bus commands, and the front panel is entirely active.

Restore Front-Panel Control

Cycling power also restores front panel control.

With HP-IB, the instrument is placed in the lockout mode by sending the

local lockout command (LLO). The instrument can be returned to local by

sending the go-to-local command (GTL) to the instrument.

Bus Commands

The following commands are IEEE 488.1 bus commands (ATN true). IEEE

488.2 defines many of the actions which are taken when these commands are

received by the instrument.

Device Clear

The device clear (DCL) or selected device clear (SDC) commands clear the

input and output buffers, reset the parser, and clear any pending commands.

If either of these commands is sent during a digitize operation, the digitize

operation is aborted.

Interface Clear (IFC)

The interface clear (IFC) command halts all bus activity. This includes

unaddressing all listeners and the talker, disabling serial poll on all devices,

and returning control to the system controller.

Programming over HP-IB

Lockout

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Agilent Technologies 54645A Manual de Instruções Página 41