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1-26 Programming Guide

Preparing for Use ESG Family Signal Generators

Getting Started with SCPI

Standard Notation

This section uses several forms of notation that have specific meaning:

Command

Mnemonics Many commands have both a long and a short form and you must use

either one or the other (SCPI does not accept a combination of the two).

Consider the FREQuency command, for example. The short form is FREQ

and the long form is FREQUENCY. This notation type is a shorthand to

document both the long and short form of commands. SCPI is not case

sensitive, so fREquEnCy is just as valid as FREQUENCY, but FREQ and

FREQUENCY are the only valid forms of the FREQuency command.

Angle

Brackets Angle brackets indicate that the word or words enclosed represent

something other than themselves. For example, <new line> represents

the ASCII character with the decimal value 10. Similarly, <END> means

that EOI is asserted on the GPIB interface. Words in angle brackets have

much more rigidly defined meaning than words shown in ordinary text.

For example, this section uses the word “message” to talk about messages

generally. But the bracketed words <program message> indicate a

precisely defined element of SCPI. If you need them, you can find the exact

definitions of words such as <program message> in a syntax diagram.

How to Use Examples

Programming with SCPI requires knowledge of two languages. You must know the

programming language of your controller (BASIC, C, Pascal) as well as the language of

your instrument (SCPI). The semantic requirements of your controller’s language

determine how the SCPI commands and responses are handled in your application.

Command Examples

Command examples look like this:

:FREQuency:CW?

This example tells you to put the string :FREQuency:CW? in the output statement

appropriate to your application programming language. If you encounter problems, study

the details of how the output statement handles message terminators such as <new line>.

If you are using simple OUTPUT statements in HP BASIC, this is taken care of for you. In

HP BASIC, you type:

OUTPUT 719":FREQuency:CW?"

Command examples do not show message terminators because they are used at the end of

every program message. See “Details of Commands and Responses” on page 1-35 for more

information about message terminators.

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