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nRF52840 DK Switching Shield Debug (P20)

I would like to use the Shield Debug (P20) on the nRF52840DK as part of a Device Under Test platform for production devices.  I also want to be able to transmit/receive data to/from the nRF52840 on the DK as this will be running a test program which is checking the functionality of the Device Under Test.

  1. Should the signals SH_VTG, SH_SWDIO, SH_SWDCLK and SH_GND_DETECT be isolated from the DUT and switched into circuit only when the DUT needs to be programmed?
  2. Which signal is actually responsible for causing the interface micro to switch to the SH_XXX signal path?  Is it the presence of voltage on SH_VTG or SH_GND_DETECT being pulled to ground?

Thanks,

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