LG M5520C Owner's Manual page 79

RS-232C
Transmission / Receiving Protocol
39. Sleep Time (Command : f f)
Set Sleep Time.
Transmission
Data
0 : Off
1 : 10
2 : 20
3 : 30
4 : 60
5 : 90
6 : 120
7 : 180
8 : 240
Acknowledgement
40. Auto Sleep (Command : f g)
Set Auto Sleep.
Transmission
Data 0 : Off
1: On
Acknowledgement
Controlling the Multiple Product
A25