Gatewaying into PDM through an M1 or Display

This is not done as usually the device that is being used as the gateway is also powered by the PDM, this means that if the PDM is restarted to enable a change, then the gateway device is also restarted as the PDM restarts.
 
When this happens, the communications are lost and it is possible for the PDM to be set to an inoperable state.

As the UTC is powered by the laptop through the USB cable, it isn't effected by the PDM power cycling.