User`s manual

:FREQuency:POINts?
[SOURce:]LIST2:FREQuency:POINts? returns a number that shows the length of
the currently defined frequency list.
Comments Executable when Initiated: Yes
Coupling Group: None
*RST Condition: Unaffected
Power-On Condition: No frequency list is defined
Example Query the Frequency List Length
LIST:FREQ2:POIN? Queries frequency list length.
[SOURce:]LIST2
360 Command Reference Chapter 8