Hello,
Even it's and very old topic, I want to put the solution for the others in here.
I have a Whirlpool HSXC 40920 dryer, and need also to know how it's the communication made.
When I was trying to measure the signal by the oscilloscope it made a big short circuit, maybe because
the levels of voltage is not raised from absolute reference ground (GND, 0V, the case, PEN, etc...) but its a difference
between potencials, raised up to the power supply voltage (230V or around that).
I was expecting that there is a 0-5V TTL logic levels, but there was so big higher voltage.
(or there were an other error, i don't know... in any case, touch of GND wire of oscilloscope to "ground" wire
at the wires between main PCB and PCB of BLCD motor made huge short circuit. Main PCB was dead.
Vdd and Vss on the PIC is connected together somewhere on the PCB).
Now I have ordered a new main PCB, and when it comes to me, will replace the broken one by the new one
(and I hope so there isn't any other parts of dryer broken. Fortunately the BLCD motor was disconnectet in that time).
For first information:
- PIC is using the UART 1-TX, UART-2RX, which is on pins 9 and 10.
- The communication wires is connected not only to PCB of BLCD motor. It's also connected to touch-screen board.
So there may be even a packets between main PCB and this panel.
By this, I'm not sure that the bytes you captured is bytes for the motor. May it be also bytes for the touch screen.
Further informations will comes next week, when the main PCB will be replaced.