Can I use an external power supply and still communicate with nRF52840 over USB Serial?

[Deeper]

Hello everyone,

I want to measure current of the whole board, I follow the instruction of nRF52840 DK , which suggest not to use the USB connector to power the board.

So I decide to use an external power supply. But I need the board to communicate with my computer through USB Serial(UART).

My question is :

Can I use an external power supply and still communicate with nRF52840 over USB Serial?

[ketiljo]

You can measure the current from the USB connector. Cut open the cable and measure the current in the red wire, that will be the easiest.