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nRF9160 DK as a Debugger for a second nRF9160 DK


I plan to design my own hardware based around nRF9160. Prior to this, I want to verify that I can use the nRF9160DK as a debugger for my own board. As an initial test, I plan to use two nRF9160 DK boards, one as a target and one as a debugger. I would like to verify the set up for this please.

On the "debugger" nrf9160DK, I connect a USB cable into J4.

I connected a 10pin cable from P22 (Debug Out) on the debugger board into P3 (nrf91 Debug in) on the target board. 

On the target board, I select "nRF only" via SW1.

Connect a second USB cable to J4 on the target board. This will provide power and VCOM on the target board.

So, I have three questions. 

1. Are my connections above correct?

2. Are there any other switches or settings I need to adjust

3. With only the target board connected to the PC, and SW1, nRF ONLY selected, I don't see any serial data over the USB connector.  I know my code is running, as it toggles a GPIO pin which I can monitor. Where is the serial port visible when the target is in nrf only mode?