Go to API Explorer and select SCI > RCI > Query device settings (as shown above)
That creates an HTTP POST request example to the /ws/sci interface with the following XML as the content of the POST:
To limit the request to a specific settings group, simply specify that group in the <query_setting/> tag. The following example will illustrate limiting the settings to just the <system> group.
You will perform an HTTP POST to SCI as above; but this time, change the request content to include the system tag:
(Note the addition of a <system> tag between the opening and closing <query_setting> tags)