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  • Q: 15)How to Attach UHF RFID Tags?

  • A:

    The answer to these questions is that just about any asset, part, product or other item can be identified, tracked and managed using 

    an ultrahigh-frequency RFID tag. But tagging methods vary, based on an item's shape, size, material and texture, 

    as well as the environmental conditions in which it will be tracked.Among the key issues that must be considered, as below:

     

    • the size of the asset to be tagged and the footprint available to receive the tag

    • the surface of the asset to be tagged, such as metal, plastic, cloth, living tissue (nursery stock, farm livestock, lab animal, 

       pets, infants), wet paint, wet chemical coating, chemically treated, abrasive

     

    • the duration of time the asset needs to be tagged—short or long term, permanent or temporary

     

    • the duration of time the item will be exposed to environmental conditions, such as extreme temperatures, moisture, 

      chemicals, abrasion, dust, human contact, pressure, salt water, animal exposure, outdoor ultraviolet exposure and weather conditions, 

      industrial processing, temperature shock (going from hot to cold and back), flash freezing (dry ice), and lab testing

     

    • the asset's temperature at the time of tagging; for example, hot molded products just out of the mold, or frozen consumer vending products



  • Q: 16)From how far away can a typical RFID tag be read?

  • A:

    The distance from which a tag can be read is called its read range. Read range depends on a number of factors, including the frequency of the radio waves uses for tag-reader communication, the size of the tag antenna, the power output of the reader, and whether the tags have a battery to broadcast a signal or gather energy from a reader and merely reflect a weak signal back to the reader. Battery-powered tags typically have a read range of 300 feet (100 meters). These are the kinds of tags used in toll collection systems. High-frequency tags, which are often used in smart cards, have a read range of three feet or less. UHF tags-the kind used on pallets and cases of goods in the supply chain-have a read range of 20 to 30 feet under ideal conditions. If the tags are attached to products with water or metal, the read range can be significantly less. If the size of the UHF antenna is reduced, that will also dramatically reduce the read range. Increasing the power output could increase the range, but most governments restrict the output of readers so that they don't interfere with other RF devices, such as cordless phones.

  • Q: 17)What Is Dense Reader Mode?

  • A:

    This is a mode of operation that prevents EPC Gen 2-compliant readers from interfering with 

    one another when many are used in close proximity to one another. Readers hop between channels 

    within a certain frequency spectrum (in the United States, they can hop between 902 MHz and 928 MHz) 

    and may be required to listen for a signal before using a channel. If they "hear" another reader using that channel, 

    they go to another channel to avoid interfering with the reader on that channel.


  • Q: 18)What's the difference between passive and active tags?

  • A:

    Active RFID tags have a battery, which is used to run the microchip's circuitry and to broadcast a signal to a reader 

    (the way a cell phone transmits signals to a base station). Passive tags have no battery. Instead, they draw power from the reader, 

    which sends out electromagnetic waves that induce a current in the tag's antenna. Semi-passive tags use a battery to run the chip's circuitry, 

    but communicate by drawing power from the reader. Active and semi-passive tags are useful for tracking high-value goods 

    that need to be scanned over long ranges, such as railway cars on a track, but they cost a dollar or more, 

    making them too expensive to put on low-cost items. Companies are focusing on passive UHF tags, 

    which cost under a 50 cents today in volumes of 1 million tags or more. Their read range isn't as far -- typcially less than 20 feet vs. 

    100 feet or more for active tags -- but they are far less expensive than active tags and can be disposed of with the product packaging


  • Q: 19)Do all countries use the same low-, high and ultra-high frequencies?

  • A:

    Most countries have assigned the 125 kHz or 134 kHz area of the radio spectrum for low-frequency systems, and 13.56 MHz is used around the world for high-frequency systems. But UHF RFID systems have only been around since the mid-1990s and countries have not agreed on a single area of the UHF spectrum for RFID. Europe uses 868 MHz for UHF and the U.S. uses 915 MHz. Until recently, Japan did not allow any use of the UHF spectrum for RFID, but it is looking to open up the 960MHz area for RFID. Many other devices use the UHF spectrum, so it will take years for all governments to agree on a single UHF band for RFID. The government also regulates the power of the readers to limit interference with other devices. Some groups, such as the Global Commerce Initiative, are trying to encourage governments to agree on frequencies and output. Tag and reader makers are also trying to develop systems that can work at more than one frequency, to get around the problem.


  • Q: 20)How do I know which frequency is right for my application?

  • A:

    Different frequencies have different characteristics that make them more useful for different applications. For instance, low-frequency tags are cheaper than ultra-high frequency (UHF) tags, use less power, and are better able to penetrate non-metallic substances. They are ideal for scanning objects with high-water content, such as fruit, at close range. UHF frequencies typically offer a better range and can transfer data faster. But they use more power and are less likely to pass through materials. And because they tend to be more "directed," they require a clear path between the tag and reader. UHF tags might be better for scanning boxes of goods as they pass through a bay door into a warehouse. It is probably best to work with a consultant, integrator or vendor that can help you choose the right frequency for your application


  • Q: 21)Are there any health risks associated with RFID and radio waves?

  • A:

    RFID uses the low-end of the electromagnetic spectrum. The waves coming from readers are no more dangerous than the waves coming to your car radio


  • Q: 22)What is the read range for a typical RFID tag?

  • A:

    The read range of passive tags (tags without batteries) depends on many factors: the frequency of operation, the power of the reader, interference from metal objects, or other RF devices. In general, low-frequency tags are read from a foot or less. High-frequency tags are read from about three feet and UHF tags are read from 10 to 20 feet. Where longer ranges are needed, such as for tracking railway cars, active tags use batteries to boost read ranges to 300 feet or more


  • Q: 23) What's the difference between read-only and read-write tags?

  • A:

    Our UHF-105 and UHF-105 UHF long-range reader, it supports read-write or read-only. With read-write chips, you can add information to the tag or write over existing information when the tag is within range of a reader, or interrogator. Read-write tags usually have a serial number that can't be written over. Additional blocks of data can be used to store additional information about the items the tag is attached to. Some read-only microchips have information stored on them during the manufacturing process. The information on such chips can never be changed. Other tags can have a serial number written to it once and then that information can't be overwritten later.


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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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