When a reader reads the information sent back by multiple tags at the same time, the problem of label collision occurs. Label conflict is the conflict between the information received by one reader and the information received by another reader, resulting in overlap.
Read-only labels: like those readable USB sticks, are only readable, that is, the internal read-only memory of the label stores the label identification information, which is usually written into the memory by the manufacturer during the manufacturing process. Such electronic labels are called read-only labels, because they are only read-only.
Readable and writable labels. As the name implies, it is the internal memory of the electronic tag, not only can read the memory, but also can write the memory. This kind of memory is generally in addition to storing data, but also can erase the previous information in the label under certain conditions to re-write the function, that is, can be used multiple times, in a certain applicable environment, the same item, may need to change the configuration of information, so, this is the use of our readable and writable electronic label.
1. Logistics: goods tracking in the logistics process, automatic information collection, storage application, port application, postal service, express delivery
2. Retail: real-time statistics of sales data, replenishment and anti-theft
3. Manufacturing industry: real-time monitoring of production data, quality tracking and automatic production
4. Garment industry: automatic production, warehouse management, brand management, single product management, channel management
5, medical treatment: medical equipment management, patient identification, baby theft prevention
6. Identification: electronic passport, ID card, student card and other electronic documents.
7, anti-counterfeiting: valuables (tobacco, alcohol, drugs) anti-counterfeiting, ticket anti-counterfeiting, etc
8. Asset management: all kinds of assets (valuable or large quantity and high similarity or dangerous goods, etc.)
9. Transportation: high-speed non-parking, taxi management, bus hub management, railway locomotive identification, etc
10, food: fruit, vegetables, fresh, food and other freshness management
11, animal identification: training animals, livestock, pets and other identification management
12, library: bookstores, libraries, publishing houses and other applications
13, car: manufacturing, anti-theft, positioning, car keys
14, aviation: manufacturing, passenger tickets, baggage package tracking
15, military: ammunition, guns, materials, personnel, trucks and other identification and tracking
16. Others
UHF RFID tag market application scenarios are quite broad, with the ability to read multiple tags at one time, long identification distance, fast data transmission speed, high reliability and life, tolerance to outdoor harsh environment and other advantages. It can be used for asset management, production line management, supply chain management, storage, anti-counterfeiting traceability of all kinds of goods (such as tobacco, alcohol, medicine, etc.), retail, vehicle management and so on.
At present, the common UHF RFID air port protocols in China include international standards, national standards, industry standards, enterprise standards and so on. The most popular standards for 6C and 6D standards, namely ISO/IEC 18000-6C(63), ISO/IEC18000-6D(64), in addition to China in May 2014 formally implemented the Chinese national standard GB/T 29768-2013.
The definition of UHF electronic tag frequency band varies around the world, such as: Frequency bands 840~844MHz and 920~924MHz for China, 865MHz~868MHz for EU, 952MHz~954MHz for Japan, 920MHz~925MHz for Hong Kong, Thailand and Singapore, The frequency band in the United States, Canada, Puerto Rico, Mexico and South America ranges from 902MHz to 928MHz.
1. the environmental problems of label application
Especially for UHF RFID products, metals and liquids have a great impact on their performance. Therefore, whether the environment of application is metal or non-metal, liquid or plastic, glass, wood, etc., is the primary consideration.
The direct impact of raw materials on the RF signal: metal has an impact on the RF signal of RFID tags. It is necessary to use anti-metal electronic tags when using metal objects or working environments with a lot of metal effects, so as to reduce the impact of metal on the tag data signal and facilitate the normal use of RFID electronic tags.
The performance of UHF RFID tags is easily affected by the environment. If we need to determine whether the product is suitable for the actual application environment, in the early test stage, the performance must be directly used on the object test to have reference value.
2. Influencing factors on label recognition distance
The reading distance is also directly related to the reader and antenna. It is necessary to clarify the installation position and Angle relationship between the label and the reader antenna. At the same time, power selection, antenna gain, polarization mode, radiation Angle and other parameters need to be considered.
In the whole RFID system, every detail may affect the actual reading distance, and whether the project can finally meet the requirements, even the length of the feeder (the cable connecting the antenna and the reader) needs to be considered in place.
3. Understanding of the size of the label
In our past experience in many projects, customers often want the label size to be small, so that it is both beautiful and easy to install.
However, the size of the label is precisely one of the main factors that determine the performance of the label. Generally speaking, the larger the size, the better the label performance can be designed. The manufacturer is not the same, the model and specification are not the same, the production process of integrated IC and the manufacturing technology of antenna are different, and the price has a certain difference. Consumers should choose according to the actual use and cost budget.
4. Other considerations
In addition, there are other detailed considerations, such as: does the label have environmental reliability requirements such as temperature and humidity resistance? How much data does the label need to write? What is the maximum number of tags to read at a time? etc.
With the continuous development of RFID technology in our country, RFID electronic tag has become increasingly common in our life. RFID technology is similar to bar code scanning, which also saves the data on the carrier in a certain way and reads the internal data through a special reading device.
Bar code is by printing data on the surface of the object, although the cost is low, convenient and fast, but the data is easy to lose, and it is not suitable for harsh environment. RFID tag technology uses a special RFID reader and a special RFID electronic tag that can be attached to the target. Frequency signals are used to transmit information from the RFID electronic tag to the RFID reader.
The industrial production environment is complex and the read and write frequency is high. How to ensure the normal read and write of tags under the use of RFID for a long time and high frequency? If the RFID tag fails, then it will not be able to scan and apply, so what is the case of RFID electronic security tag failure?
1. The label is damaged
Usually the label uses PPS, PVC, resin, ceramic and other industrial materials as the shell, but in extreme cases, it is possible to damage the label, such as external pressure exceeding the label bearing force resulting in chip damage or coil fracture, high static electricity or high voltage will also cause irreparable damage to the label.
The label protection level of morning control intelligent production reaches IP68, and it also has the ability of waterproof, high temperature, chemical corrosion, acid and alkali, oil and so on. It can be applied to most industrial environments and can be used normally. Therefore, as long as the label is installed to avoid external force extrusion and power supply accessories to prevent high voltage and high static electricity on the force surface, the label can be used normally.
2. The label is not damaged
RFID technology is through the card reader to generate a magnetic field for the tag energy transmission, the tag from the magnetic field of the card reader to obtain energy and return the data to the card reader, and the electromagnetic wave can't completely penetrate the metal, so the tag will fail in the case of metal barrier, water can absorb electromagnetic wave, although the tag is waterproof, but if the tag works in the liquid will also lead to the situation that cannot be read.
RFID transmits energy and information through magnetic field. In the motor, power supply and other strong magnetic field accessories, the magnetic field of the card reader will be disturbed, resulting in the inability to read the tag data. The sensing area of the card reader is distance limited. The tag must enter the sensing area to read and write data normally. The distance of the sensing area depends on the type of equipment and the field environment.
To sum up, RFID technology can penetrate paper, wood, plastic and other non-metallic materials to read data and carry out penetrating communication, but it is difficult to work normally in the case of metal barrier, water wrapped or strong magnetic field, and there is a high probability of failure.
3. Label type
Tags can be divided into different types according to their own material and chip integration protocol. Apart from physical characteristics, the working protocol of the tag determines whether the tag can communicate with the card reader.
For example, a card reader using Modbus data type cannot correctly decode the label using the free protocol, and can only read a bunch of garbles. Therefore, when developing RFID, Morning Control Intelligent develops the corresponding label for each type of card reader, and only the supporting card reader and label can decode the data normally and complete the data exchange
