Wemos D1 Mini V3 - Connecting to the EMS Bus; Bus Connection Options; Reference Repository

Connecting to the bus
You can use EITHER the EMS bus service jack OR the screw terminal.
Do not connect them at the same time, because you might short circuit the bus.
If you use the screw terminal, polarity does not matter because the circuit corrects both orientations.
OR
You can use the following Github repository as a general starting point:
https://github.com/bbqkees/EMS-Wiki