The lift has one call button at each landing, and all car and landing calls are memorised by the controller. The car calls are answered in both directions of travel while landing calls are answered serially during descent. This provides faster access in the downward direction of travel for passengers at landings and reduces random travel of the lift compared to APBC systems. There is a significant saving in power consumption and passenger waiting time.

The lift has one call button at each landing, and all car and landing calls are memorised by the controller. The car calls are answered in both directions of travel while landing calls are answered serially during descent. This provides faster access in the downward direction of travel for passengers at landings and reduces random travel of the lift compared to APBC systems. There is a significant saving in power consumption and passenger waiting time.