US Patent 7057547 Mounted remote control unit with plug-in module interface

A fixed position remote control unit 20 as used with a movable barrier operator 11 has an externally accessible plug-in module interface 25. This interface 25 operably couples to the link 23 and 24 between the remote control unit 20 and the operator 11. So configured, a plug-in module 40 that docks and couples with this plug-in module interface 25 can receive operating (or charging) power from the movable barrier operator 11, exchange signaling with the movable barrier operator 11, or both. The ability to readily exchange signaling without invasive wiring permits a wide variety of plug-in modules 40 to be utilized.