Germany dicon2000 logic control system by a hierarchical control and signal system to provide rapid response to external to the local area network. The system can be serially connected to eight sets of car control manager (C-Com), every car control manager can that operates like a system manager, can independently control the operation of the car. Through the preset system software, can implement group control system. Hall call signal will be connected to the main and auxiliary system, main and auxiliary replacement group management system. The connection between different systems is serial communication.