Overview of Messages

Parameters

The parameter format of SCPI is derived from the program parameter format defined in IEEE 488.2.

The representation system of the program data that is used on the PMX is indicated below.

Non-numeric parameters

Character string data (String)

Used when a series of ASCII characters are requested.

Be sure to enclose a string in single or double quotation marks. The start and end quotation marks must match.

SYSTem:LANGuage "SCPI"

If you wish to use a quotation mark as a part of the string, enter two quotation marks consecutively (with no characters in between).

Character data

Character data is used when only a limited number of values are available for the program setting. Responses are returned in the short form.

TRIGger:TRANsient:SOURce {BUS|IMMediate|TIMer}

Boolean data

Boolean data expresses a 1 or 0 condition or an ON or OFF condition. Responses are returned as 1 or 0.

OUTPut {ON|OFF|1|0}

Numeric parameters

R1

Represents an integer.

Details are defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation.

NR2

Represents a real number (floating point).

Details are defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation.

NR3

Represents a real number (exponential).

Details are defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation.

The value +3.80000E+02 is returned for the response data 380. The number of digits to the right of the decimal is 5.

NRf

NRf is a generic term that includes NR1, NR2, and NR3.

Numeric

A numeric is a parameter such as a decimal point, optional prefix, or measurement unit.

The syntax of a numeric representation is the same as NRf.

MINimum and MAXimum are available as substitutes for declaring certain values.

Units such as V, A, and W can also be used in a numeric parameter.

If a value that cannot be assigned is entered, the device rounds the value to the closest possible value.

For example, if the following value is entered for the voltage of PMX18-5 :

VOLT 20

The PMX18-5 voltage can only be set to a value between 0 and 105 % of the rated output voltage, so 18.9 is returned in response to the VOLT? query.

Special form numeric parameters

The special form numeric parameters MINimum, MAXimum and DEFault can be used as substitutes for the values when the parameter is numeric. In the example below, the current limit is set to the minimum value.

CURRent:PROTection MINimum

Queries can be used to inquire the minimum and maximum values for most parameters.

CURRent:PROTection? MAX

CURRent:PROTection? MIN

Measurement units

Below are the default measurement units.

  ·V (voltage) ·A (current)
  ·S (second)  

 

The following optional prefixes are supported.

·M (milli)        ·U (micro)

NOTE

• The unit symbols in the International System of Units (SI) contain lowercase characters. The IEEE standard uses uppercase characters. SCPI commands are not case-sensitive.
Commands are accepted even if a measurement unit is not specified.
• To enter "µ" in the data, use "U" instead.

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