LG M4720C Owner's Manual page 87

RS-232C RS-232C
Output waveform
single pulse, modulated with 37.917kHz signal at 455kHz
► Configuration of frame
▪ 1st frame
Lead Low
code custom code
C0 C1 C2 C3 C4 C5 C6 C7 C0 C1 C2 C3 C4 C5 C6 C7 D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7
▪ Repeat frame
Repeat code
►
Lead code
►
Repeat code
►
Bit description
▪ Bit "0"
0.56 ms
1.12 ms
►
Frame interval : Tf
▪ The waveform is transmitted as long as a key is depressed.
Tf = 108 ms @ 455 kHz
Controlling the Multiple Product
Remote Control IR Code
Tc
T1
High
custom code
9 ms
9 ms
2.25 ms
▪ Bit "1"
Tf
IR Codes
Carrier frequency
FCAR = 1 / Tc = fosc / 12
Duty ratio = T1 / Tc = 1 / 3
Data code
Tf
4.5 ms
0.55ms
0.56 ms
2.24 ms
Tf
A31 A31
Data code