HP LD4220tm and LD4720tm Digital Signage Touch Displays

IR codes
Use this method to connect your wired remote control port on the display.
Remote Control IR Code
Output waveform
● Single pulse, modulated with 37.917kHz signal at 455kHz
●
Carrier Frequency
◦
FCAR = 1/Tc=fosc/12
◦
Duty Ratio = T1/Tc = 1/3
Configuration of frame
● 1st frame
●
Repeat frame
Lead code
Repeat code
Bit description
●
Bit “0”
0.56 ms
1.12 ms
ENWW IR codes 91