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Programming Manual

3 Introduction to SCPI

SCPI (Standard Commands for Programmable Instruments) is a programming language for

controlling instrument functions over the RS232 or IEEE 488 bus. The same SCPI commands

and parameters control the same functions in different classes of instruments. For example, you

would use the same MEAS:VOLT? command to measure the Power supply output voltage or

the output voltage of a SCPI-compatible Multimeter.

3.1 Conventions Used in This Manual

Angle brackets<> Items within angle brackets are parameter abbreviations. For example,

<NR1> indicates a specific form of numerical data.

Vertical bar Vertical bars separate alternative parameters. For example, 0 | 1

indicates that either "0" or "1" can be used as a parameter.

Square Brackets [ ] Items within square brackets are optional. The representation

[SOURce:]VOLT means that SOURce: may be omitted.

Boldface font Boldface font is used to emphasize syntax in command definitions.

CURR <NRf> shows a command definition.

Upper case font Upper case font is used to show program lines in text. OUTP 1 shows a

program line.

3.2 The SCPI Commands and Messages

This paragraph explains the syntax difference between SCPI Commands and SCPI messages.

The power supply supports two types of commands, IEEE-488-2 common and SCPI subsystem

commands.

 IEEE-488-2 common commands are generally not related to specific operations but to

controlling overall Power supply functions such as reset, status and synchronization. All

common commands consist of a three-letter mnemonic preceded by an asterisk:

*RST *IDN? *SRE 255

 SCPI Subsystem commands perform specific Power supply functions. They are organized

into an inverted tree structure with the "root" at the top. Some are single commands while

others are grouped within specific subsystems. You must include the root header in all

commands sent to the Power supply.

Refer to appendix A for the SCPI tree structure.

Types of SCPI Messages

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

 A program message consists of one or more properly formatted SCPI commands sent from

the controller to the Power supply. The message, which may be sent at any time, requests

the Power supply to perform some action.

 A response message consists of data in a specific SCPI format sent from the Power supply

to the controller. The Power supply sends the message only when commanded by a

program message called a "query."

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Argantix KDC 80-62 Manuel d'utilisateur Page 20