14 SSG5000A Programming Guide
2 SCPI Overview
2.1
Command Format
SCPI commands present a hierarchical tree structure containing multiple subsystems; each of the
subsystems is made up of a root keyword and several sub keywords. The command string usually
starts with a colon “
:
”, the keywords are separated by a colon “:” and the parameter settings are
separated by spaces. Query commands add a question mark “?” to the end of the string.
For example:
:SOURce:FREQuency <freq>
:SOURce:FREQuency?
SOURce is the root key of the command, FREQuency is second.
The command begins with “
:
”, and separates the keywords at the same time, <freq> separated by
space and represents the parameter available for setting; “?” represents a query. A query sent to the
instrument indicates that the instrument will have a response string. Therefore, queriies ask a
question and expect a response.
2.2
Symbol Instruction
The following four symbols are not the content of SCPI commands and cannot be sent with the
commands, but are used to describe certain aspects of the commands.
1.
Triangle Brackets < >
The parameter in the triangle brackets must be replaced by an effective value. For example:
Send the “POWer:SPC:TARGet <power>” command in “POWer:SPC:TARGet 0”.
2.
Square Brackets [ ]
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