Alexey

I ran into exactly the same issue with an LG S09EQR air conditioner. The circuitry for the CN_REMO connector was not populated on the PCB. I found the missing components...

> это имеет смысл, но может быть на модуле esp есть еще один делитель напряжения? I've already figured it out and realized that in this project, the device doesn't receive...

> That's incorrect, there's definitely two way communication. The controller receives settings and status information from the AC. But in this hardware implementation, when sending messages to the ESP32, you...

> I'm not sure if the 'Drying' mode turns the outdoor unit on - does anyone know? I've never used that mode :) Drying mode is essentially the same as...

> Unknown as state tells that the serial link doesn't works ? The cables are connected behind the PREMTB100. And I did not connect the 3.3V to the ESP as...

> На данный момент я не могу это воспроизвести: > It's possible that the different behavior between modules is related to the fact that, after each change to the initial...

> Does the controller actually _receive_ messages from the AC? Is it possible to check this somehow through logging? Or only with an oscilloscope? )) I thought that the line:...

Replaced R5 with 10 kOhm. Nothing changed in the logs.

> Это от контроллера (он тоже получает свои сообщения). Для сообщений от AC он должен сказать что-то вроде "получил C8...." I did some investigation using my basic oscilloscope. As I...