The chip might be those ASIC, application specific intergrated circuit chip, not a general purpose UART. It is designed to lower manufacturing costs by high volume. Omerons are magnetic relays to drive the higher current motor to open and close the garage door and buffering for the sensors. Is this from a Chamberlin, Genie Overhead Doors, or Stanley? These are the most popular brands in California, U.S.A.
Lawsen