ABSTRACT
Access control system[1][2] is also called the “gateway control system.” It is a management and control system that is in order to ensure people’s production, living, working, property safety, and important road entrances. Access control management is one of the main components in many contents of the modern security system. It has three features: advanced, security, and stability. The access control system realized the control of access by installing door contact, electric control lock, card reader, and other control devices in the building of entrances, elevators, warehouses, and other important departments and was monitored by a computer or a management person and porthole, the nature of the same object, and counterpart time real-time control. As the core of the access control, access controller completes the important work of field data collection, processing, transmission, and so on. Traditional access control is usually developed by SCM, using serial communication port to transmit data to a remote upper computer, and multiple access controller is usually composed of RS485 network.
