I am in possession of a solar water heater with Resol BX controller with VBus output. Try the VBus read with UART and Arduino Mega and the program of bbqkees. What should I omit in this program to read out only S1, S2, S3, S4, P1 and P2 via serial Pc? 0x7421 is the code for my Resol BX. Who can help ...