I think with my newly gained knowledge, I need to do further investigation. Unfortunately, the unit is mounted in a small house in the garden, which is not well insulated. This is why I am unsure whether the temperature was either 13°C or 19°C.
When I started the unit approximately 15 minutes earlier, it was 2°C inside, which is why my values indicate a rather cold environment.
I still haven’t installed the wired remote control - when I tested it, it was lying on a pile of chair cushions.
The reply of 0xC4 matches the reply of 0xC6. I am currently extending the dissector. I’ll create a new repository later where I will put my filtered packet dumps for your own research.
My ESP32 board has some electrical issues, which is why some frames may be corrupt. I will fix this before my next tests.
Just guessing here, but the IR remote has 3 different ‘follow me’ commands. There’s a ‘start follow me mode’, ‘follow me temp update’, and ‘stop follow me mode’. The only practical difference between the first two are the ‘update’ doesn’t cause the unit to beep, as that would be annoying every 3 minutes.
For future reference if people already have a Midea Wifi Subassembly installed by default (which was the case for me) simple plug in the SLWF-01pro. This could also be done by the poster who made this tutorial. The soldering part of the female USB A is redundant.
Display panel communication in CN1
4 pin (gnd, +5v, tx, rx) My clima Main panel Indoor unit CN18
See picture. Main panel communicate the display panel microcontroller RX, TX (RED draw the picture)
microcontroller comunnication the wifi modul RX TX, CN3 fake USB (Yellow draw the picture)
or wired controller not communication RX,TX (+ and - out the panel and back isolated 2 pin IR led… Work the cover reflect IR signal the normal IR receiver)
i think the short answer is: as far as i know nobody really looked into this communication channel and tracing of wires! (But these just exist on the newer high wall units, in cassette or duct systems, there is no equivalent and CN3 is directly wired to the main board)
On my unit the chain is XYE-Bus-Adapter (official multifunction board) >> R/T pin CN1 >> DisplayBoard-processor “itself”>> RX/TX(CN1) >> Wall-Unit Main board. (which means these pins can route all most commands to mainboard) The R/T pin is a bidirectional! interface pin with currently unknown protocol.
If you have not already read it: the old 90’s style remotes (pre-bus versions) where just wired remotes, that transmitted the ir signals over a wire, but were constantly powered with 5V (Send only, no return) CN2 may be such a “relict”
On the unit i have access to, i cannot hardwire a logic analyzer, but i think it is worth a look.
My guess is that the processor on the display board is just something like a packet router/filter that for some request/response-patterns writes the result to the display. (That may be why the"mute" function for follow-me is needed)
I have tested with my air cond., esp32 and TTL to RS485
I just wanted to give you some feedback for the project.
I also tried the original IR remote and the status of the air conditioner changes (seen on HA).
It does not read only the fan speed change, which remains on automatic.
In my case I tried to set a timer from the air conditioner and it is seen perfectly.
I do not have a correct return of the ‘Outside coil temp’ value.
Current always shows 255.
Automode does not work
If you need other tests let me know.
[19:12:39][D][uart_debug:114]: <<< AA:C0:80:00:00:00:30:10:00:80:1A:53:4E:FF:46:FF:00:00:00:00:00:00:00:00:00:00:00:14:FF:FF:EF:55
[19:12:40][D][uart_debug:114]: >>> AA:C0:00:00:80:00:00:00:00:00:00:00:00:3F:81:55
[19:12:40][W][component:237]: Component midea_xye.climate took a long time for an operation (150 ms).
[19:12:40][W][component:238]: Components should block for at most 30 ms.
If you want to precisely figure out the Follow Me temperature, you could set up another board with an IR blaster and send a specific temperature (I believe your wall remote can receive IR commands directly?) rather than trying to determine the physical temp.
In my MKG-V300C the PQE is not factory soldered and the modbus chip seems to be missing. Could you please share more information about how you managed to get it working via the XYE?
Can you tell me how to use an external temperature sensor from the home assistant (indoor) to control the air conditioner?? Will I be able to control this thermostat through automation?
Maybe I didn’t put it right, I want to use the air conditioner as a heat pump. The indoor unit will be missing, so I don’t need to monitor the temperature sensor that is located on the indoor unit, but it is this sensor that appears in the thermostat (climate: - platform: midea). That is, I need to control this thermostat using an external sensor.
