LG M4720C Owner's Manual page 78

Controlling the Multiple Product
RS-232C
Transmission / Receiving Protocol
38. Scheduling Input select (Command : f u) (Main Picture Input)
To select input source for TV depending on day.
Transmission
[Data 1]
1. f1h to f4h(write/read one index)
f1: read 1st index of On Time Input
f2: read 2nd index of On Time Input
f3: read 3rd index of On Time Input
f4: read 4th index of On Time Input
[Data 2]
Input
*When you read/delete the current On Time Input, [Data2] needs to be FFH.
(ex1: fu 01 f1 ff - when you read 1st index of On Time Input
ex2: fu 01 f3 02 - when you write one On Time Input Data in to 3rd index, "AV")
Acknowledgement
A24