I have a quick question about the use of the nRF51 DK's Debug Out port (P19) to program external nRF51 boards.
The user guide says that the DK will "detect the supply voltage of the board" and then activate P19. The P19 connector has pins marked EXT_VTG and EXT_GND_DETECT. I assume that EXT_VTG is the pin that needs to be connected to 3.0V on the external board. However, does EXT_GND_DETECT also need to be grounded for P19 to become activated?
