First, system overview
The full name of the AFC system is the Automatic Fare Collection System. It is an automated system based on computer, communication, network, and automatic control technology to realize rail transit ticketing, ticket checking, billing, charging, statistics, clearing, and management. Rail transit in developed cities abroad has generally adopted this type of management system and has developed to a fairly advanced technological level. The automatic ticket issuing equipment for urban rail transit stations in China is originally from foreign countries. In recent years, China has carried out a large number of development and research work, proposed various forms of products, and the level of technology has been continuously improved. The development of domestic rail transit AFC system has experienced a process from scratch. With the development of computer technology and software, the technology of China's urban rail transit AFC has been integrated with the city's one card to achieve a card for urban and even urban areas.
The structure of the AFC system has been divided into five levels, namely, ticket, station terminal equipment, station computer system, line central computer system, and clearing system.
The hierarchical structure is based on a fully-closed operation mode, based on the metering mode, using the non-contact IC card as the principle of composition of the ticket media, and dividing the functions, management functions, and locations of the devices and subsystems at each level. of. The currently identified five-tier structural model is based on the national conditions of China and the current status of urban development, and comprehensively takes into account the characteristics of rail transit construction (such as multiple lines and complex, long construction period, multiple owners, etc.) Scalability. The following provisions shall be made for the functions and requirements that must be implemented at each level:
The first floor—the ticket is the fare payment vehicle held by passengers. It specifies the technical requirements for the physical characteristics, electrical characteristics, application file organization, and security mechanisms of stored-value cards and one-way tickets.
The second floor—the station terminal equipment is installed in the station halls of each station to directly provide passengers with equipment for ticket inspection services, and specifies the technical requirements for station terminal equipment and its operation and management;
The third level—station computer system, whose main function is to monitor the status of the second-tier station terminal equipment, collect the transactions and audit data generated by the station, and specify the data management, operation management and system maintenance management of the system. skills requirement;
The fourth layer, the central computer system of the line, whose main function is to collect the transaction and audit data generated by the AFC system of this line, and transmit this data to the urban rail transit clearing system and reconcile it with the Line ticket ticketing management, operation management and system maintenance technical requirements;
The fifth layer—the clearing system, whose main function is to unify various operating parameters within the AFC system of urban rail transit, to collect transactions and audit data generated by the urban rail transit AFC system, and to perform data classification and reconciliation, as well as Connecting the Urban Rail Transit AFC system and the Urban Card Clearing System specifies the technical requirements for ticket management, ticketing management, operation management and system maintenance management.
Second, the system requirements combined with the above application site features the system has the following requirements 1, multi-channel serial port applications 2, multi-channel digital I / O applications such as automatic ticket outlets, non-contact IC cards, display screens for displaying prompt information , Blocking device controllers, central controllers, alarms, etc. 3, network interface, USB interface application requirements, and information communication with the system terminal.
4, low power consumption fanless cooling good demand 5, dust, wide pressure input demand 6, high stability and high demandability requirements
Third, the product list and advantages For the above special application needs EVOC introduced automatic ticket inspection AFC main control system ECR series host, AFC provides the perfect solution.
Product specification:
â— Onboard Intel low-power ATOM N270 1.6G CPU, on-board DDR2 1G memory â— 512KB NVRAM non-volatile memory support
â— Support VGA+LVDS dual display â— 14 serial ports (including 2 RS-232/422/485), 1 parallel port â— 4 USB 2.0 ports, 32 digital I/O ports â— 1 1000Mbps RJ45 network port ( Support network remote wakeup)
â—Working temperature: -20°C～+65°C
â— Power input: DC 18 ~ 26V
IV. Conclusions Advantages of the program:
⊙ Adopting Intel low-power ATOM series CPU as the core of the main control system, low power consumption, no fan-free and fully-enclosed design, and it perfectly solves many stringent requirements such as heat dissipation, dust prevention, vibration, and stability of AFC site.
⊙ Rich serial ports and digital I/Os, in line with a variety of control equipment and monitoring equipment in the field of good access.
⊙ DC wide voltage input, suitable for the fluctuation of different voltages in the field.
⊙ Supports the Windows XP-embedded embedded operating system, supports the embedded system-specific EWF system protection function, and meets the unreliable system's high reliability and high stability requirements.