Rigol DS1204B Programming Manual page 18

RIGOL
Function:
The command sets Math function amd its menu on or off.
10. :KEY:REF
Command Format:
:KEY:REF
Function:
The command sets reference waveform function and its menu on or off.
11. :KEY:F1
Command Format:
:KEY:F1
Function:
The command selects the first option in current menu. If the subordinate menu
existing and its options are available, then these options could be selected
circularly when send repeatly the command.
12. :KEY:F2
Command Format:
:KEY:F2
Function:
The command selects the second option in current menu. If the subordinate
menu existing and its options are available, then these options could be selected
circularly when send repeatly the command.
13. :KEY:F3
Command Format:
:KEY:F3
Function:
The command selects the third option in current menu. If the subordinate menu
existing and its options are available, then these options could be selected
circularly when send repeatly the command
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Programming Guide for DS1000B Series