![microcontroller - Velux controller and input panel seem to communicate via a bus wire with a pull-up without resistor, how? - Electrical Engineering Stack Exchange microcontroller - Velux controller and input panel seem to communicate via a bus wire with a pull-up without resistor, how? - Electrical Engineering Stack Exchange](https://raw.githubusercontent.com/timdiels/velux_wli_130/main/oscilloscope/up1.bmp)
microcontroller - Velux controller and input panel seem to communicate via a bus wire with a pull-up without resistor, how? - Electrical Engineering Stack Exchange
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