Someone sent me one a few years back and I had it working but I remember nothing about what I did. I searched the xLights release Readme and found this so apparently I added code to make it work.
2018.6 Feb 06, 2018
-- enh (gil) Add LOR event to xSchedule which should work with the Input Pup board.
-- enh (gil) Update LOR events to work with multiple cards on one port.
So my guess would be in xSchedule you would do Edit -> Events, Add, set dropdown to LOR, then enter Unit Id, Port #, speed, channel, and set it to the command you want it trigger.