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Remote Control

*RST = *rst

:DATA? = :data?

:SYSTem:PRESet = :system:preset

Long-form and short-form versions

A SCPI command word can be sent in its long-form or short-form version.

However, the short-form version is indicated by upper case characters.

Examples:

:SYSTem:PRESet long-form

:SYST:PRES short form

:SYSTem:PRES long-form and short-form combination

Note that each command word must be in long-form or short-form, and

not something in between.

For example, :SYSTe:PRESe is illegal and will generate an error. The

command will not be executed.

Query

Observe the following precautions with queries:

⚫ Set up the proper number of variables for the returned data. For example, if

you are reading back a measurement array, you must dimension the array

according to the number of measurements that you have placed in the

measurement buffer.

⚫ Read back all the results of a query before sending another command to

the electronic load. Otherwise a Query Interrupted error will occur and the

unreturned data will be lost.

1.4 Message Type of SCPI

There are two types of SCPI messages, program and response.

⚫ program message: A program message consists of one or more properly

formatted SCPI commands sent from the controller to the electronic load.

The message, which may be sent at any time, requests the electronic load

to perform some action.

⚫ response message: A response message consists of data in a specific

SCPI format sent from the electronic load to the controller. The electronic

load sends the message only when commanded by a program message

called a "query."

The next figure illustrates SCPI message structure:

ITech IT8512A+ Programming Guide

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