System and method for RFID (Radio Frequency Identification Devices) remote-distance card-reading

Abstract

The invention discloses a system and a card-reading method for RFID (Radio Frequency Identification Devices) remote-distance card-reading. The system comprises a data collector, a card reader and a radio frequency card, wherein the data collector adopts an ARM (Advanced RISC Machines) processor and is connected with the card reader by an RS485 communication interface; the card reader comprises a singlechip and a radio frequency circuit, receives data sent by the radio frequency card and responds to the radio frequency card; the radio frequency circuit is provided with a plurality of channels for reading the data of the radio frequency card and sending the data to the radio frequency card; the radio frequency card adopts an active RFID card; the radio frequency card has a carrier signal detection function and a channel idle evaluation function; and the carrier signal detection function is used by the radio frequency card to judge whether the radio frequency card enters a card-reading zone. According to the invention, low energy consumption and the function of preventing collision confliction can be realized, card-reading distance is long, card-reading efficiency is greatly improved, and requirements on card-reading space are much lowered.

Description

【Technical field】 [0001] The invention belongs to the field of information technology, and specifically refers to an RFID long-distance card reading system and a method thereof, which are mainly used in the fields of logistics, monitoring and attendance checking. 【Background technique】 [0002] The radio frequency identification system (referred to as RDID) uses radio frequency signals to transmit digital data wirelessly. Therefore, the identification card can read and write digital data without contact with the card reader. There is no directional requirement, and the card can be placed in a pocket or purse, and can be directly identified without taking it out. [0003] Passive RFID card readers are commonly used at present. Passive RFID cards use inductive coupling and low-frequency RFID technology. At present, the frequency used in large quantities is below 135khz, and the communication distance is generally less than 1 meter. The read card does not need battery power. ...

AI Technical Summary

Problems solved by technology

The feature of this technology is that the card reading distance is short, the communication distance between the RFID card reader and the RFID card is short, and the card to be read must be close to the card reader to be read, such as swiping card attendance for daily commute to and from get off work, and swiping card attendance attendance for primary and secondary schools, etc. For the application, if there are many people, they must queue up one by one, and the efficiency is relatively low

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