4 Operating the Power Supply Remotely

SCPI Command Completion

SCPI commands sent to the power supply are processed either sequentially or in parallel. Sequential commands finish execution before a subsequent command begins. Parallel commands allow other commands to begin executing while the parallel command is still executing.

The following is a list of parallel commands. You should use some form of command synchronization as discussed in this section before assuming that these commands have completed.

 

OUTPut:STATe

INITiate

 

VOLTage

OUTPut:PROTection:CLEar

 

CURRent

 

 

 

The *WAI, *OPC, and *OPC? common commands provide different

 

ways of indicating when all transmitted commands, including any

 

parallel ones, have completed their operations. Some practical

 

considerations for using these commands are as follows:

*WAI

This command prevents the power supply from processing subsequent

 

commands until all pending operations are completed. For example,

 

the *WAI command can be used to make a voltage measurement after

 

an output on command has completed:

 

OUTPut ON;*WAI;:MEASure:VOLTage?

*OPC?

This command places a 1 in the Output Queue when all pending

 

operations have completed. Because it requires your program to read

 

the returned value before executing the next program statement,

 

*OPC? can be used to cause the controller to wait for commands to

 

complete before proceeding with its program.

*OPC

This command sets the OPC status bit when all pending operations

 

have completed. Since your program can read this status bit on an

 

interrupt basis, *OPC allows subsequent commands to be executed.

 

The trigger subsystem must be in the Idle state for the status OPC bit to be

NOTE

 

true. As far as triggers are concerned, OPC is false whenever the trigger

 

subsystem is in the Initiated state.

 

 

 

 

 

Device Clear

 

 

 

You can send a Device Clear at any time to abort a SCPI command

 

that may be hanging up the GPIB interface. Device Clear clears the

 

input and output buffers of the power supply. The status registers,

 

error queue, and all configuration states are left unchanged by Device

 

Clear. Device Clear also prepares the power supply to accept a new

 

command string. The following statement shows how to send a device

 

clear over the GPIB interface using Agilent BASIC:

 

CLEAR 705

IEEE-488 Device Clear

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Series N5700 User’s Guide

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Agilent Technologies 5743A, 5752A, 5744A, 5748A Scpi Command Completion, Device Clear, Subsystem is in the Initiated state
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