Card system, "the functional components 
 * Center management subsystem: all equipment used to manage the card, including the host, control equipment, etc., is responsible for setting its various communication parameters, including host ID, serial number port, baud rate, etc.; 
 * Access Control Management Subsystem: Achieving control of electronic door locks, access time recording; 
 * Consumer management subsystem: consumption of internal staff to achieve statistical inquiries; 
 * Attendance management subsystem: the implementation of internal staff time and attendance statistics; 
 * Parking Management Subsystem: on all vehicles entering and leaving the car park building for centralized control and management; 
 * Patrol management subsystem: The inspection staff (or security) of the control and management of inspection records; 
 * Card issuers subsystems: the implementation of the card types are authorized to operate within; 
 * Personnel management subsystems: the system requirements for the card company, department, personnel, vehicles, data entry, modification, management and query; 
 Library management subsystems: management staff to borrow books and statistics; health care management subsystem: medical staff, treatment, effective management of medical costs.