Panasonic A75C3208 Remote

[barchasse38]

Hello,

Thank you for the project and the work accomplished.

I'm trying to control a Panasonic Inverter, the remote part provided in the manual is CWA75C3208.

I tried all the Panasonic protocol provided in the project and none of them was entirely satisfactory.

DKE / LKE / JKE / NKE works for the mode selection (OFF / HEATCOOL / HEAT / COOL / DRY) but the temperature selection doe not ;
-Selecting the minimum temp send the max temp to the inverter
-Selecting the maximum temp send the min temp to the inverter
-Selecting other temp does nothing.

Could the problem be with the hardware?
Or it just means that the remote use another protocol ?

If so I want to try to decode this new protocol and share it on the project.

Thank you for your help

[ToniA]

Hi, it's probably a protocol issue. It seems that on every model Panasonic does some minor tweaking to the protocol. I friend of mine has a couple of years old Panasonic on this summer cottage, and I just could get any sense out of the protocol. We finally ended up sending recorded signals, instead of trying to understand what they do.

[barchasse38]

Hi Toni,

Thank you for your quick response.

I will try to understand how the protocol works by testing this week-end, I will let you know how I progress and I will try to implement it in the project.

Regards

[barchasse38]

I had time to do some tests.

Just like the other Panasonic protocol, the remote sends 2 frame :

First frame, 8 bytes :
0x40,0x04,0x07,0x20,0x00,0x00,0x00,0x60]

No change from the other Panasonic protocols

Second frame, 19 bytes
0x40,0x04,0x07,0x20,0x00,0x92,0x14,0x01,0xF5,0xB0,0x00,0x70,0x07,0x00,0x00,0x81,0x00,0x00,0x44

Byte 6 : Mode (0x92 -> Heat)
Byte 7 : Temp (0x14 -> 20°)
Byte 9 : Air Swing & Fan Speed
Byte 19 : Checksum

Seems similar to the DKE / JKE / NKE protocol, the temp is on byte 7, i don't understand why it doesn't work

Powerfull / Quite button sends a second frame of 8 bytes
0x40,0x04,0x07,0x20,0x01,0x39,0x4C,0x2A

Seems similar to the AltDKE protocol

I am rather optimistic, there is not much missing for me to be able to write a functional protocol.
If you have any idea why the Temp doesn't work.