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RIGOL Chapter 1 SCPI Overview
1-2 DSA800 Programming Guide
Syntax
SCPI commands present a hierarchical tree structure and contain multiple sub-systems, each of which is
made up of a root keyword and one or more sub-keywords. The command string usually starts with ":", the
keywords are separated by ":" and are followed by the parameter settings available, "?" is added at the end
of the command string to indicate query and the command and parameter are separated by a space.
For example,
:CALCulate:BANDwidth:NDB <rel_ampl>
:CALCulate:BANDwidth:NDB?
CALCulate is the root keyword of the command. BANDwidth and NDB are the second-level and
third-level keywords respectively. The command string starts with ":" which separates the multiple-level
keywords. <rel_ampl> represents the parameter available for setting, "?" represents query and the
command :CALCulate:BANDwidth:NDB and parameter <rel_ampl> are separated by a space.
"," is generally used for separating different parameters contained in the same command, for example,
:SYSTem:DATE <year>,<month>,<day>
Symbol Description
The following four symbols are not the content of SCPI commands and will not be sent with the commands,
but are usually used to describe the parameters in the commands.
Braces { }
The parameters enclosed in the braces are optional and can be ignored or set for one or more times. For
example,
In the [:SENSe]:CORRection:CSET<n>:DATA <freq>,<rel_ampl>{,<freq>,<rel_ampl>} command, the
frequency and amplitude in {,<freq>,<rel_ampl>} can be omitted or be set to one or more values.
Vertical Bar |
The vertical bar is used to separate multiple parameters and one of the parameters must be selected when
sending the command. For example,
In the :DISPlay:ANNotation:CLOCk[:STATe] OFF|ON|0|1 command, the command parameters available are
"OFF", "ON", "0" or "1".
Square Brackets [ ]
The content (command keyword) enclosed in the square brackets can be omitted. For example,
for the [:SENSe]:POWer[:RF]:ATTenuation? command, sending any of the four commands below can
generate the same effect:
:POWer:ATTenuation?
:POWer:RF:ATTenuation?
:SENSe:POWer:ATTenuation?
:SENSe:POWer:RF:ATTenuation?
Triangle Brackets < >
The parameter enclosed in the triangle brackets must be replaced by an effective value. For example,
send the :DISPlay:BRIGhtness <integer> command in :DISPlay:BRIGhtness 5 format.
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