Programming Fundamentals

Parameters in Commands

Parameters in Commands

There are four basic types of parameters: boolean, key words, variables and arbitrary block program data.

Boolean

The expression OFFON01 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, and queries of the parameter always return a numeric value of 0 or 1.

Key Word

The parameter key words that are allowed for a particular command are defined in the command description and are separated with a vertical slash.

Units

Numerical variables may include units. The valid units for a command depends on the variable type being used. See the following variable descriptions. If no units are sent, the indicated default units will be used. 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 variable range and its optional units are defined in the command description.

In addition to these values, the following key words may also be used in commands where they are applicable.

MINimum - sets the parameter to the smallest possible value.

MAXimum - sets the parameter to the largest possible value.

UP - increments the parameter.

DOWN- decrements the parameter.

Include the key word MINimum or MAXimum after the question mark in a query in order to return the numeric value of the key word.

Example query: [:SENSE]:FREQuency:CENTer? MAXimum

Variable Parameters

<ampl>,

 

<rel_ampl>

The <ampl> (amplitude) parameter and the <rel_ampl> (relative

 

amplitude) parameter consist of a rational number followed by

 

optional units. Acceptable units for <ampl> include: V, mV, V,

 

dBm, dBmV, dBV, Watts, W. <rel_ampl> units are given in dB.

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Agilent Technologies Model  A.08.xx manual Parameters in Commands, Example query SENSEFREQuencyCENTer? MAXimum

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