Agilent Technologies N8201A Service Manual download pdf (Page 159)

SCPI Basics 6

Agilent N8211A/N8212A Performance Upconverter Synthetic Instrument Module, 250 kHz to 20 / 40 GHz 159

For example, with the :FREQuency:REFerence:STATe ON|OFF|1|0 command, the

N8211A/N8212A accepts :FREQuency:REFerence:STATe ON,

:FREQuency:REFerence:STATe 1, :FREQ:REF:STAT ON, :FREQ:REF:STAT 1

to turn on the frequency reference mode.

Each parameter type has one or more corresponding response data types. A setting that

you program using a numeric parameter returns either real or integer response data when

queried. Response data (data returned to the controller) is more concise and restricted and

is called precise talking.

Precise talking means that the response format for a particular query is always the same.

For example, if you query the power state (:POWer:ALC:STATe?) when it is on, the

response is always 1, regardless of whether you previously sent :POWer:ALC:STATe 1

or :POWer:ALC:STATe ON.

Numeric Parameters

Numeric parameters are used in both common and subsystem commands. They accept all

commonly used decimal representations of numbers including optional signs, decimal

points, and scientific notation.

If a N8211A/N8212A setting is programmed with a numeric parameter which can only

assume a finite value, it automatically rounds any entered parameter which is greater or

less than the finite value. For example, if a N8211A/N8212A has a programmable output

impedance of 50 or 75 ohms, and you specified 76.1 for the output impedance, the value is

rounded to 75. The following are examples of numeric parameters:

Table 15 Parameter and Response Types

Parameter Types Response Data Types

Numeric Real, Integer

Extended Numeric Real, Integer

Discrete Discrete

Boolean Numeric Boolean

String String

100 no decimal point required

100. fractional digits optional

−1.23 leading signs allowed

4.56E<space>3 space allowed after the E in exponential

−7.89E−001 use either E or e in exponential

+256 leading + allowed

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Agilent Technologies N8201A Service Manual Page 159