Multi Access Controller WS-511 
                              For Connect several kinds of the Sensors,Access Equipement 
                              Hopping code (Rolling code type) 
                              Can connect to sensors,access controller,door lock,switch,program switch 
                              With this controller then Can realize the function as following: 
                                Normal automatic; 
                                  Single direction 
                                  Lock 
                                  Hold open 
                                  Half open (Depend on your automatic door controller)  |