Table of Contents
Advertisement
4.12.5
SCPI Command Hierarchy
SCPI is an ASCII-based command language designed for use in test and measurement equipment.
The command structure is organized around common roots, or nodes, which are the building
blocks of the SCPI subsystems. An example of a common root is OUTPut. Some of the commands
that reside in the OUTPut subsystem are:
OUTPut
[:STATe] <bool>
:PON
:PROTection
A colon (:) is used to separate a command keyword from a lower-level keyword.
4.12.6
Header
Headers are instructions recognized by the power supply. Headers (which are sometimes known
as "keywords") may be either in a long or short form.
Long form: The header is completely spelled out, such as VOLTAGE, STATUS, and DELAY.
Short form: The header has only the first three or four letters, such as VOLT, STAT. and DEL.
The SCPI interface is not case sensitive. It will recognize any case mixture, such as TRIGGER,
Trigger, and TRIGger. Short form headers result in a faster program execution.
4.12.7
Data Formats
Data
Formats
<NR1>
<NR2>
<NR3>
<NRf>
<NRf+>
<Bool>
[:STATe] <DSC>
:CLEar
:FOLDback
[:MODE] <DSC>
Description
Digits with an implied decimal point assumed at the right of the least
significant digit. Example: 255
Digits with an explicit decimal point. Example: .0253
Digits with an explicit decimal point and exponent. Example: 2.33E+2
Extended format that includes <NR1>, <NR2> and <NR3> Examples: 263
263.1 263E+2
Expanded decimal format that includes <NRf> and MIN, MAX. Examples: 263
263.1 263E+2, MIN, MAX. MIN and MAX are the minimum and maximum limit
values that are implicit in the range specification of the parameter. *
Boolean data. Examples: 0|1 or OFF|ON. Boolean parameters represent a
single binary condition that is either true or false. I.e. for a false condition,
the power supply will accept "OFF" or "0". For a true condition, the power
supply will accept "ON" or "1"
* Any number x which holds -0.5<x<0.5 is regarded as FALSE, otherwise
TRUE.
(OUTPut:STATe
{OFF|ON}).
97
Advertisement
Table of Contents
