Laboratory access control system based on CAN bus and Ethernet

Abstract

The invention discloses a laboratory access control system based on a CAN (Controller Area Network) bus and Ethernet. The system comprises a server, a communication bus and an access control lower computer. The server is a PC (Personal Computer) for management and monitoring; the communication bus comprises a CAN bus, CAN-to-Ethernet modules, an Ethernet and a switch. The access control lower computer comprises an external collector, a main controller, an exit button and an electric control lock; each floor is provided with one CAN-to-Ethernet module; the CAN bus is connected with the Ethernet through the CAN-to-Ethernet modules; the switch gathers the converted Ethernet of each floor and is connected to the server side through the Ethernet; the external collector sends a card number or password data to the main controller through serial port communication. By virtue of the advantages of reliability, real-time performance and flexibility of CAN bus communication and the additional arrangement of the CAN-to-Ethernet modules, problems of limited underlying equipment, short communication distance, decentralized management and the like of the traditional access control are solved, andefficient centralized management of an open laboratory is realized.

Description

technical field [0001] The invention relates to the fields of field bus technology and automatic control, in particular to a laboratory access control system based on CAN bus and Ethernet. Background technique [0002] With the advancement of the construction of "new engineering" and the continuous development of innovation and entrepreneurship education, major universities have strengthened the construction of open laboratories. At present, many laboratories still restrict students from entering and leaving the laboratory through traditional door locks, which not only increases the difficulty of laboratory management, but also cannot be open around the clock, making the idle resources of the laboratory unreasonable. The emergence of the access control system has solved these problems, and the effect of intelligent management can be achieved by using the access control system. However, most of the communication methods of access control systems currently on the market are o...

AI Technical Summary

Problems solved by technology

One-to-one communication access control equipment is not conducive to the centralized management of the laboratory; the access control system using the RS485 bus has a limited number of bottom access control card reading devices, which is not suitable for large-scale laboratories, and the RS485 bus is in There are also deficiencies in data transmission rate, anti-interference ability and response speed.

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