I have a Linux computer (Ubuntu 20.04.5) and a Harman Kardon AVR51 A/V receiver which has a 3.5mm input jack for IR remote control.
My question is, if it is possible to send some kind of command from a USB port on that computer so the receiver for example turn on/off.
I've tried to Google it but from my searching no one tried this before. My idea is to use a USB to serial port adapter and send the data this way.
So in a short way, my goal is to control the AVR51 receiver from computer through cable.