As far as I am aware the "Functions" have only been used with Lintronics to date and are intended for 3rd party control.
The Lintronic relay card is a good example and teh following are the "Control" and "Function" commands
CONTROL COMMANDS
Control 0 = All relays
Control 1 = Relay 1
Control 2 = Relay 2
Control 3 = Relay 3
Control 4 = Relay 4
Control 5 = Relay 5
Control 6 = Relay 6
Control 7 = Relay 7
Control 8 = Relay 8
FUNCTION COMMANDS
Function 1 = On for 1 second
Function 2 = On for 2 seconds
...
Function 30 = On for 30 seconds
Function 31 = On constantly
Function 32 = Off constantly
Function 33 = Toggle On/Off
Function 34 = Reserved
Function 35 = Reserved
Function 36 = Reserved
Function 37 = Toggle "Input 1"
Function 38 = Toggle "Input 2"
These are used with the "Light" command