https://devzone.nordicsemi.com/f/nordic-q-a/35585/debug-messages-using-swd-interfaceHi currently I am working with the nRF52840 Preview DK. Using the on-board J-Link interface I can send debug messages to the debug console of the Segger Embedded Studio. However, if I use the SWD interface together with an external J-Link programmeren-USTelligent Community 13Thu, 21 Jun 2018 16:19:54 GMThttps://devzone.nordicsemi.com/thread/137158?ContentTypeID=1Thu, 21 Jun 2018 16:19:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:85fb7e0e-8b00-44c3-a674-0e5c529b5c89Kenneth<p>Hi,</p> <p>Not sure why you want to use an external J-Link programmer if you already have the on-board programmer on the DK, but to answer your question:</p> [quote user=""]However, if I use the SWD interface together with an external J-Link programmer the debug messages do not appear on the console. How can I fix that?[/quote] <p>Can it be that you now have two debuggers on the interface? Have you also connected GND and VTG?</p><div style="clear:both;"></div>