Introduction to the SCPI Language
Keywords
Queries
Command Separators and Terminators
Syntax Conventions
Parameter Types
Device Clear
Typical Command Processing Times
Introduction
This instrument complies with the rules and conventions of the present SCPI version (see
SYSTem:VERSion?).
SCPI (Standard Commands for Programmable Instruments) is an ASCII-based instrument command
language designed for test and measurement instruments. SCPI has two types of commands,
common and subsystem.
IEEE-488.2 Common Commands
The IEEE-488.2 standard defines a set of common commands that perform functions such as reset,
self-test, and status operations. Common commands always begin with an asterisk ( * ), are three
characters in length, and may include one or more parameters. The command keyword is separated
from the first parameter by a blank space. Use a semicolon ( ; ) to separate multiple commands as
shown below:
Subsystem Commands
Subsystem commands perform specific instrument functions. They are comprised of alphabetically
arranged commands that extend one or more levels below the root in a hierarchical structure, also
known as a tree system. In this structure, associated commands are grouped together under a
common node or root, thus forming subsystems. A portion of the OUTPut subsystem is shown below
to illustrate the tree system. Note that some [optional] commands have been included for clarity.
OUTPut
[:STATe] OFF|0|ON|1
:DELay
:FALL <value>|MIN|MAX
:RISE <value>|MIN|MAX
:INHibit
:MODE LATChing|LIVE|OFF
6 SCPI Programming Reference
203 Keysight N6900/N7900 Series Operating and Service Guide
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