difference between debug (P18) in and debug out (P19)

[Cindy]

Hi

I plan to use nrf52 DK to program my device by using a connector https://www.tag-connect.com/product/tc2030-idc-nl

But should I connect it to debug in or debug out?

what's the difference between them?

Thanks,

Cindy

[ketiljo]

No, it will only be able to connect and program one device at the time. 

From the user guide: When the external board is powered, the interface MCU will detect the supply voltage of the board and program/debug the target chip on the external board instead of the onboard nRF52832.

[Cindy]

so with the same PuTTY setting, I should be able to get the data reading from my external board no problem?

[awneil]

PuTTY is just a terminal - it needs to connect to a UART.

The Debug Out connector does not carry any UART signals.