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SCPI Command Overview
SCPI (Standard Commands for Programmable Instruments) is a standardized
instrument programming language that is built upon the existing standard IEEE 488.1
and IEEE 488.2 and conforms to various standards, such as the floating point
operation rule in IEEE 754 standard, ISO 646 7-bit coded character set for information
interchange (equivalent to ASCII programming). The SCPI commands provide a
hierarchical tree structure, and consist of multiple subsystems. Each command
subsystem consists of one root keyword and one or more sub-keywords.
Syntax
The command line usually starts with a colon; the keywords are separated by colons,
and following the keywords are the parameter settings available. The command
ending with a quotation mark indicates querying a certain function and returns the
query results. The keywords of the command and the first parameter are separated by
a space. For example,
:SYSTem:COMMunication:LAN:IP:ADDress
<
value>
SYSTem
is the root keyword of the command,
COMMunication
is the second-level
keyword,
LAN
,
IP
,
ADDress
are the second-level, third-level, forth-level and fifth-
level keywords respectively. The command line starts with a colon, and different levels
of keywords are also
separated by colons. <
value> indicates a settable parameter.
The command ending with a quotation mark
"?"
indicates querying. The command
keywords
:SYSTem:COMMunication:LAN:IP:ADDress
and the parameter <
value>
are separated by a space.
In some commands with parameters,
","
is often used to separate multiple
parameters. For example,
[:SOURce][:RF
<
channel>
]:SWEep:LIST:ADDList
<
freq>,<level>,<time>
Symbol Description
The following symbols are not sent with the commands.
1. Braces { }
The parameters enclosed in the braces are optional. You do not have to set it, also
you can set for one or more times.
2. Vertical Bar |
The vertical bar is used to separate multiple parameters. When using the
command, you must select one of the parameters. For example,
:SYSTem:LANGuage
<
type>
Wherein, <
type> can be set to CHINese|ENGLish.
3. Square Brackets [ ]
SCPI Command Overview
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