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Some common problems of RFID UHF reader

At present, UHF readers have slowly penetrated into the application management of various industries, and more and more people have begun to use UHF readers. However, from the experience of Qiansheng Technology for many years of professional R&D, production and sales of UHF readers, many customers will always encounter various problems when they use them. So, today we will summarize some common application problems for everyone.

Q: Can the reader handle multiple tags at the same time?

Answer: Yes. By using anti-collision technology, RFID systems can process multiple tags simultaneously. Some of our UHF readers use anti-collision communication protocols, an effective binary tree anti-collision mechanism, and can read and write more than 100 per second, regardless of the number of tags in the work area.

Q: Why is the UHF reader more expensive than the low frequency?

Answer: first,UHF reader is better than LF reader in identifying distance, identification of multi label and the space that users can use.  Second, the protocol of UHF reader is more complex, and the RFID label chips which can produce ultra high frequency are less and many chips are imported. The price is relatively high, which directly leads to the increase of cost.

Q: What are the advantages of RFID tags and barcode comparisons?

Answer: RFID tag can scan quickly, scan multiple labels at the same time, and bar code can only be scanned once at a time. Moreover, RFID tags are highly resistant to contamination and durability, and can be reused.

Q: What factors will affect the reading distance of UHF readers?

Answer: The reading distance is mainly affected by the performance of the reader module, the antenna gain, the size of the tag, but also by environmental factors.

Q: What are the working modes of UHF reader?

Answer: 1. COMMAND: In this mode of operation, the UHF reader works under the control of a PC or other controller. The reader and the control unit can communicate via one of RS232, RS485 or Ethernet interfaces. This way of working supports all the features provided by the secondary development kit.

2. TIMING READ: The UHF reader reads the card automatically in a certain period (configurable), and the read data is output through the designated communication port. The operation of the UHF electronic tag is read-only.

3. Trigger READ: When the input input port is low level, the UHF reader starts to read the card periodically and automatically turns off after a period of time.

Q: How to distinguish between low frequency, high frequency and ultra high frequency?

Answer: First of all, the working frequency is different (low frequency: about 125KHz; high frequency: 13.56MHz; ultra high frequency or UHF: 860-960MHz;); secondly, the reading distance is different.

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