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1 Introduction to RFID technology
Radio Frequency Identification (RFID) is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and electromagnetic coupling to transmit data to realize automatic identification of identified objects.
According to the working frequency of the label, it is divided into:
Low frequency, representing frequency 125KHz
High frequency, representative frequency 13.56MHz
UHF, representative frequency 915MHz
Microwave, representative frequency 2.45GHz
It can be seen from the above that the IDs and ICs currently in use are actually RFID technology. The lower the frequency, the longer the wavelength and the closer the radio frequency signal transmission distance. This can explain why ID and IC cards can only read a few centimeters. -Tens of centimeters, while UHF cards can read several meters or even dozens of meters.
2 Demand analysis of UHF for access control and attendance
Existing time and attendance management systems (ID, IC) often require too many close manual operations, especially in factories with a large number of personnel. During peak hours, there are often a large number of employees at the door, which is extremely inefficient. The RFID (UHF) technology is introduced into the attendance management system, and the anti-collision of UHF tags is used to input the employee information corresponding to the electronic tag number in the background, so that multiple people at a long distance (3m-5m) can swipe their cards to complete the attendance at the same time. It greatly improves the efficiency of personnel attendance management, and can also be seamlessly connected with the original relevant management system of the enterprise, which improves the overall management level and grade of the enterprise.
3 Application introduction
Real-time display and recording of attendance records: the read data is transmitted to the management system in real time, and displayed in the management center computer in real time; various information such as employee information, event time, door address, event type, and event type can be truthfully recorded and recorded Cannot be changed.
Remote real-time query: help corporate managers use the network to know the attendance of internal personnel at any time, and timely query personnel attendance, access management and other platform services. Remote information and data statistics synchronization business processing.
Parallel processing of attendance and salary calculation: the attendance of attendance employees is linked to wages, and the intelligent management software can export the attendance records of employees, which is convenient for linking with financial software, reducing possible errors and inconveniences caused by repeated data processing.
Report system: The system provides a comprehensive report system for users to check at any time, which truly realizes the paperless operation of the report system. It can also generate various intelligent reports: personnel management registration reports, personal attendance reports, various normal attendance and abnormal attendance reports, etc.
4 Difficulties of UHF Remote Access Control and Time Attendance System
UHF radio frequency signals will be absorbed by metals and liquids. If these two types of objects exist in the environment of use, they will cause unpredictable obstacles to the entire communication process. The human body environment in personnel attendance will absorb UHF radio frequency signals, so leakage is easy. Reading phenomenon, in practical applications, we recommend that customers install an LED electronic display where they are checking attendance, and connect it to the control board of the attendance machine. When the cardholder successfully reads the card information in the induction area, the background system sends instructions To the control board, the control board transmits the signal to the display screen, displays the cardholder’s name on the screen, and sets the time the information stays on the screen as needed; so that the cardholder goes to the sensing area without seeing himself on the screen Take out the card and adjust it to the best reading position until you see your name displayed on the screen.
5 Main components of UHF RFID remote access control and attendance system
Attendance machine control panel: connect the attendance machine, the display screen and the background host, receive the signal from the attendance machine, and send it to the host. The host sends the instructions back after processing, and the control panel then transmits the instructions to the display screen or the attendance machine.
Attendance machine (card reader): directly connected to the control board, the terminal of the intelligent attendance management system reads the information on the employee’s attendance card, records the time of reading the card at that time, and transmits the information to the control board.
Attendance card: RFID (UHF) electronic tags can be customized according to customer needs.
LED display:
Attendance management software: realize attendance record, query, statistics, print, attendance shift setting, report output and other functions.
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