Abstract: A remote unit (14) couples to an obstacle detection sensor (13) to both detect an obstacle in the path of a movable barrier (11) and operability of the obstacle detection sensor (13) itself. Information regarding these and, optionally, other parameters (such as battery status) is coded and transmitted as a short burst wireless transmission to an interface unit (15). The interface unit (15) decodes the message and provides controlling information to a movable barrier operator (12) as appropriate when an obstacle is present, when the sensor (13) is faulty, or when other monitored parameters are out of normal bounds. In addition, the interface unit (15) can provide local alarms (auditory and visual) when detecting one or more of the above conditions.

Abstract: A remote unit 14 couples to an obstacle detection sensor 13 to both detect an obstacle in the path of a movable barrier 11 and operability of the obstacle detection sensor 13 itself. Information regarding these and, optionally, other parameters (such as battery status) is coded and transmitted as a short burst wireless transmission to an interface unit 15. The interface unit 15 decodes the message and provides controlling information to a movable barrier operator 12 as appropriate when an obstacle is present, when the sensor 13 is faulty, or when other monitored parameters are out of normal bounds. In addition, the interface unit 15 can provide local alarms (auditory and visual) when detecting one or more of the above conditions.