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並前往https://electronics.stackexchange.com/questions/506867/vusb-5v-selector-to-safely-power-knx-project

VUSB / +5V selector to safely power KNX project - Electrical ...

From the datasheet, there is no risk to the TP-UART if you power through the USB when there's no external power (I assume KNX is P1 ).

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