Before I realized it already a month has passed since my last log so here is a little update.

Because my old and trusty laptop is undergoing a huge transformation to become a dedicated compact desktop for my hobby, all I had on hand to use with my cheap logic analyzer was my useless Nexus 7 tablet. Since there’s an Android version of PulseView available, I decided to give it a go. After two long weeks of flashing various ROMs and trying all the USB cables I had, I couldn’t manage to get PulseView to detect my logic analyzer… Until I realized that none of my USB cables were OTG type. Fortunately, I had an extension USB cable lying around long enough to connect my logic analyzer in the living room to my computer in the next room.

It strikes me how stupid I can be sometimes.

After this miserable failure, I hooked everything up and captured the data between the air conditioner and the RAC adapter, with no controller connected, while adjusting the settings via the remote control.

Here are the results:
 - the RAC adapter sends the same message composed of 9 packets, each starting with "MT" and ending with 0D (hex). The time between each packet is about 48ms and the same message is sent every 4376ms. The packet structure is "MT P=xxxx C=yyyy[0D]".
 - the air conditioner responds to each packet sent, roughly after 12ms. Each response packet starts with "OK" and ends with the same 0D (hex). The packet structure is "OK P=xxxx C=yyyy[0D]" or "OK P=xx C=yyyy[0D]".

You can check the files "Analysis (2020_06_06).xlsx" and "No controller_OFF.sr" for more details.