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