The Design Of Intelligent District Entrance Guard System Based On DCS

Entrance guard system is a system of detecting people coming in and out, and it isalso called access management system. Entrance guard system has already become theimportant components of the houses or buildings and the sign of intelligent districtmanagement.In this paper, an intelligent district entrance guard system based on the DCS usingwireless data transmission module is designed, which achieved the management ofwalk-in in intelligent district. This system consists of hardware design and softwaredesign.In hardware design, various kinds of function parts are designed, such as the non-contact-type ID card(H4001 card) reader based on U2270B chip, an entrance guardcontroller, which cosists of wireless data transmission module, LCD module, randompasswords keyboard module, data storage module. Thereinto, the LCD module is used todisplay district broadcast messages, assists keyboard to complete the random passwordoperation, data storage module contains MM36SB020 and FM24C256 chip, 16×16lattice Chinese characters is loaded by the former, and the latter is used to store cardholders’ information, card brushing information, district broadcasting information, randomkeyboard module has the essential input function, furthermore, it provides anothermethod of opening door for users. In addition, the lock drive circuit, preventing pry alarmcircuit and the host communication interface circuit design are introduced respectively.In software design, the slave software design and the software design are described indetail. In the slave software design, by analyzing the data structure of the entrance guardsystem, a main program design, card reading module program, card brushing recordmodule program and passwords keyboard program design are introduced respectively. Inthe host software design, the Access database is used, and technology of ADO is used toaccess the database. Finally, convenient operating and administrating interface is designed.Communication is the key to ensuring the normal operation of systems. Comparingpolling way and slave request way, the slave request forms is proposed as thecommunication proposal for the DCS. Control orders in communication protocol isformulated, the method of time delay at random is applied to send message and theprinciples of limited lifespan is adopted, which ensure the successful communication inDCS. In the intelligent district entrance guard system based on DCS, wirelesscommunication is adopted to realize the communication between the controller and themanagement center server. Which is easy to install and demolition, thereby the difficultyof system construction is reduced greatly, which will help the future managers to improvedthe facilities. In summary, the intelligent district entrance guard system based on the DCShas broad application prospects.