34
<>
The text in the brackets represents the parameters of the command.
[ ]
The words in square brackets indicate optional commands.
{}
When braces contain several parameter items, it means that only one
item can be selected from it.
( )
The abbreviations of parameters are in parentheses
majuscule
The abbreviation of command.
9.1.3 Command tree structure
SCPI commands are tree-structured and can be parsed down three levels (note: the
instrument's command parser can parse down any level), where the highest level is called
subsystem commands.The subordinate command is valid only if the subsystem command
is selected, and the SCPI uses a colon (:) to separate the high-level command from the
low-level command.
Fig 9
‐
1 Command tree structure
For example:
ROOT:CCC:DDD ppp
ROOT
CCC
DDD
Third level
ppp
Parameters
9.2 Commands and parameters
A command tree is composed of commands and parameters, separated by 1 spaces
(ASCII: 20H).
For example: AAA:BBB 1.234
commands [parameters]
9.2.1 commands
Command words can be long command format or abbreviated form, using long format for
engineers to better understand the meaning of the command string; abbreviated form for
writing
。
9.2.2
Parameters
Single command word command, no parameter
