The relay board communicates to the UltraConverter (see the Guardian Series Access Control System – Installation Manual for more on the UltraConverter) on the same RS-485 data network as the keypad system. You can run a dedicated 18/2 OAS wire from the Surge Board on the relay board to the UltraConverter or daisy-chain the data wiring with a nearby keypad.
Note that the relay board can also communicate to the UltraConverter wirelessly. For more information on how to set this up, please read the Guardian Series Access Control System – Installation Manual.
IMPORTANT: The relay board, even though likely mounted in an electrical room or office, should still have the Earth Ground wire on the Surge Board connected to a nearby grounding rod or other adequate grounding source to dissipate any surges that may travel in from nearby keypads.