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RFID Reader-Writer Ascendancy
Sep 20, 2017

The abbreviation of RFID read-write device (Radio Frequency Identification), also known as "the RFID reader", namely the Radio Frequency Identification (RFID), through the radio-frequency Identification signal automatically identify target and obtain relevant data, without human intervention, can recognize the moving objects and can identify multiple RFID tags at the same time, fast and convenient operation. RFID readers have fixed and handheld RFID readers, which include low frequency, high frequency, ultra-high frequency, active, etc.

RFID technology is applied in many industries, such as logistics, anti-counterfeit traceability, industrial manufacturing, ETC. Especially after the concept of industry 4.0, RFID reader is widely used in manufacturing industry.

RFID readers are increasingly prominent in manufacturing, transportation, and warehouse management in the manufacturing industry. In the production process instead of barcode brush gun, automatic collection data; The material pull part is coordinated with AGV car transport; Warehouse link management of goods in and out, inventory, etc.

In the Electronic Toll Collection of the speedway Electronic Toll Collection, the reader is defined as the Road Side Unit, which is the Road Side Unit, which reads and writes the on-board Unit.

RFID reading and writing is applied in the management of the vehicle, realizing the identification of vehicles, automatic deduction. If a long distance RFID reader can be used, it can realize the fast lane of no parking, no card access, or unattended access.

Working principle

RFID reader (reader) wirelessly communicates with RFID electronic tags and can read or write the tag identification code and memory data. A typical reader consists of a high frequency module (sender and receiver), control unit, and reader antenna.

The basic model of the rfid system is shown in figure 8-1. Among them, electronic tags are also known as radio frequency tags, transponders, data carriers. Readers are also known as readout devices, scanners, communicators, readers (depending on whether the rfid tags can wirelessly rewrite data). Between electronic tag and reader rf signal was achieved by coupling element space (no contact) coupling, the coupling channel, according to the temporal relations, achieve energy transmission, the exchange of data.

There are two types of coupling that occur between a reader and an electronic tag.

(1) inductive coupling. The transformer model is coupled by the space high frequency alternating magnetic field, which is based on the law of electromagnetic induction, as shown in the right image.

(2) : electromagnetic backscattering coupling model of radar principle, electromagnetic launch out, after touching the target reflection and carried back to the target information at the same time, the space is based on the electromagnetic wave propagation law.


RFID reader is an essential part of the application system, and the correct selection of the RFID reader will affect the smooth implementation and implementation cost of the customer project. It is best to go through a rigorous process to ensure the success of the project.

First, we need to pay attention to the frequency range of the reader device and see whether it meets the frequency specification of the project.

Second, the maximum emission power of the reader and the antenna selection of the antenna are exceeded;

Third, read the number of antenna ports for read-write devices, and if the application requires multi-interface reader;

Fourth, whether the communication interface meets the requirements of the project;

Fifth, understand the reading distance and anti-collision indicators, and the reading distance indicator should specify what antennas and labels are tested; The collision should make sure that the label is read in exactly how long.

Sixth, a RFID application system in addition to and read and write about, and tags, antenna, also be label material, by labeling items movement speed, surrounding environment, etc, before the equipment is determined it can simulate the scene test and verify, ensure that the product can meet the demand of application;

Seventh, the stability of continuous test equipment under the simulation condition, ensure the stable work for a long time.

Eighth, see whether can meet the demand of system development, development data best support the system you are using, and related routines, best if we do not support, and development time will be very long, and even development.

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