Agilent Technologies E4406A VSA manual Parameters in Commands

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Parameters in Commands

Programming Fundamentals

SCPI Language Basics

Parameters in Commands

There are four basic types of parameters: booleans, keywords, variables and arbitrary block program data.

OFFON01

 

(Boolean)

This is a two state boolean-type parameter. The

 

numeric value 0 is equivalent to OFF. Any numeric

 

value other than 0 is equivalent to ON. The numeric

 

values of 0 or 1 are commonly used in the command

 

instead of OFF or ON. Queries of the parameter always

 

return a numeric value of 0 or 1.

keyword

The keywords that are allowed for a particular

 

command are defined in the command syntax

 

description.

Units

Numeric variables may include units. The valid units

 

for a command depend on the variable type being used.

 

See the following variable descriptions. The indicated

 

default units will be used if no units are sent. Units can

 

follow the numerical value with, or without, a space.

Variable

A variable can be entered in exponential format as well

 

as standard numeric format. The appropriate range of

 

the variable and its optional units are defined in the

 

command description.

 

The following keywords may also be used in commands,

 

but not all commands allow keyword variables.

 

• DEFault - resets the parameter to its default value.

 

• UP - increments the parameter.

 

• DOWN - decrements the parameter.

 

• MINimum - sets the parameter to the smallest

 

possible value.

 

• MAXimum - sets the parameter to the largest

 

possible value.

 

The numeric value for the function’s MINimum,

 

MAXimum, or DEFault can be queried by adding the

 

keyword to the command in its query form. The

 

keyword must be entered following the question mark.

 

Example query: SENSE:FREQ:CENTER? MAX

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Chapter 2

Page 62
Image 62
Agilent Technologies E4406A VSA manual Parameters in Commands