LCD read out on back (upper right corner) of the Interface box- it should end with the... "A----" showing rotating channel numbers, not dashes; the 'Data' LED on radio (left center of Interface back side) does not light or flicker to show G6 scoreboard radio communication to remote (radio) devices.
Embedded Lantronix box has loose or disconnected 25 pin or 9 pin connections inside the Interface box.
Solution: Remove 5 screws on back of interface box (corners and center – not the ones near the radio or lower right middle). Pry clear plastic back out of the black plastic case carefully.
Find loose connectors (9 pin and/or 25 pin) for the Lantronix box and reattach and secure with screws, or tywraps, etc.