Fingerprint network attendance system of serial port server

This article discusses a system that uses fingerprint identification technology for attendance, combined with the serial server ATOP TIgerLink GW21S-256 protocol conversion function, will only provide RS232 / 485 serial attendance terminals to access Ethernet to achieve network attendance. The design idea, overall composition, and software and hardware implementation of the system are introduced, which has certain practical value for the modernization of enterprise personnel management.

1 Introduction

At present, fingerprint recognition technology has been applied to various comprehensive information management systems, and it can be designed to use fingerprint recognition technology for attendance. Instead of the traditional punch card system, avoid the phenomenon of punch card substitution. However, the fingerprint attendance terminal is a single-chip microcomputer control system, which usually only provides RS232 / 485 serial communication. For units with scattered attendance locations, long distances, and multiple attendance terminals, RS232 / 485 cannot complete long-distance network data transmission. . At present, the network architecture technology based on the TCP / IP protocol has been widely used in various environments such as companies, campuses, factories, and government agencies. In terms of host computer software, TCP / IP libraries are provided under various operating systems and programming language environments. Writing TCP / IP applications is as simple as writing a serial port program, or even simpler. Under this premise, through a special protocol conversion device (TCP / IP protocol-serial communication protocol), also known as a serial server, you can easily connect the device to Ethernet without changing the program of the terminal device to achieve real-time Network transmission of data.

There are two types of application systems using fingerprint identification technology-embedded systems and desktop application systems connected to PCs. The embedded system is a relatively independent complete system, it can complete its designed functions independently without connecting other devices or computers, and the desktop application system connected to the PC has a flexible system structure. And fingerprint identification devices can be shared by multiple systems, and large database applications can be established.

With the development of industrial control networking, the real-time data of field terminal equipment is required to be transmitted through the existing local area network or even wide area network to become a general need for industrial automation. The serial port server is Yang Wenzhong: Master Lecturer Education Science and Technology Research Key Project (Teaching Technology Division 2001224), a protocol conversion module that provides RS-232 or RS-422 / 485 serial ports by providing 1, 2, 4, 8, or 16 ports Interface, and a 10 / 100M Ethernet interface, can connect RS-232 / 422/485 serial devices to TCP / IP network without changing the control program, the host computer uses TCP / IP protocol to access through Ethernet The connected terminal device. The upper computer adopts Socket programming.

2 Overall system design

2.1 Design ideas

The embedded fingerprint identification system is embedded in the application system of the single chip microcomputer as a fingerprint time and attendance terminal, which eliminates the phenomenon of card punching, which is simple in design and easy to use. Use the serial port server to convert the RS232 serial communication protocol of the fingerprint attendance terminal controlled by the single chip microcomputer into TCP / IP protocol, so as to easily access the TCP / IP network, and download the pre-collected user fingerprints from the upper PC to the fingerprint attendance through the network conveniently Terminals, terminal attendance records can also be easily uploaded to the upper management system through the network at any time, so as to achieve network attendance.

2.2 Overall system composition

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