I donīt know Daikin, I have mitsubitshi here in my house, but certainlly maybe the same. The comunication between the indoor and outdoor units itīs Serial. If you post the model of the Daikin you have we can look to find the service manual on the net itīs not diffcult.
Basically the Inverter can divide on several blocks:
-Power Filter and Rectifier
-PWM controller (compresor and fan)
-Logical and signal handling (uProcessor)
In my opinion itīs easy to try to get the unit working removing original electronics, and installing custom controller.
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