Movable barrier operator

Abstract

A movable barrier operator having improved safety and energy efficiency features automatically detects line voltage frequency and uses that information to set a worklight shut-off time. The operator automatically detects the type of door (single panel or segmented) and uses that information to set a maximum speed of door travel. The operator moves the door with a linearly variable speed from start of travel to stop for smooth and quiet performance. The operator provides for full door closure by driving the door into the floor when the DOWN limit is reached and no auto-reverse condition has been detected. The operator provides for user selection of a minimum stop speed for easy starting and stopping of sticky or binding doors.

1 . A barrier movement operator comprising: 
 a barrier movement controller for controlling a position of the barrier and having a digital data output port;    a wall control comprising apparatus for generating signals to control the barrier movement controller;    a communication bus connecting the barrier movement controller and the wall control and for conveying electrical power from the barrier movement controller to the wall control for powering the functions of the wall control.    
     
     
         2 . A barrier movement operator according to  claim 1  wherein the barrier movement controller comprises apparatus for transmitting and receiving digital data at the output port.  
     
     
         3 . A barrier movement operator according to  claim 1  where data is communicated and power is conveyed via two conductors of the communication bus.  
     
     
         4 . A barrier movement operator according to  claim 3  wherein the communication bus comprises two conductors.  
     
     
         5 . A barrier movement operator according to  claim 1  wherein the barrier movement controller stores protocols for digital data communication via the communication bus.