Radio Frequency Identification (RFID) RFID is a non-contact automatic identification technology that automatically identifies targets and acquires relevant data through RF signals. The RFID system is mainly composed of an RFID reader, an RFID antenna and an electronic tag. The RFID reader (reader/writer) wirelessly communicates with the RFID electronic tag through the antenna, so that the tag identification code and the memory data can be read or written. A typical reader includes a high frequency module (transmitter and receiver), a control unit, and a reader antenna.
The basic classification of readers:
1. According to the communication protocol, it can be divided into ISO/IEC14443 protocol reader and ISO/IEC15693 protocol reader.
The readers of the ISO/IEC 14443 protocol read near each other and are basically close-range. Mainly used in production automation, access control attendance, security, card and product anti-counterfeiting
The ISO/IEC 15693 protocol reader reads farther and can communicate over long distances. It has a wide range of applications, production automation, medical management, jewelry inventory, asset management, parking management and product anti-counterfeiting, access control attendance, conference sign-in, barrier-free access, asset management, logistics and supply chain, library management, medical management and Access control tickets and other fields.
2, RFID reader frequency band classification
Labels and readers need to be modulated to the same frequency to work. LF, HF, UHF correspond to RF at different frequencies. LF stands for low frequency radio frequency, around 125KHz, HF stands for high frequency radio frequency, around 13.54MHz, UHF stands for UHF radio frequency, in the range of 850 to 910MHz, there is 2.4G microwave reader. There are 4 frequency bands in operation, low frequency (125KHz), high frequency (13.54MHz), ultra high frequency (850-910MFz), microwave (2.45GHz). Each frequency has its characteristics and is used in Different fields, so to use correctly, you must first choose the right frequency.
RFID reader selection:
1. Know which frequency is suitable for our products.
Different frequencies have different characteristics, so their uses are also diverse. For example, low-frequency tags are cheaper than UHF tags, save energy, and penetrate scrap metal objects. They are best suited for objects with high water content, such as fruits. UHF has a wide range of functions and transmits data quickly, but they are more energy-intensive, have less penetrating power, and can not interfere with the work area. They are suitable for monitoring items transported from the harbor to the warehouse. As a choice, it is best to consult the relevant experts, suppliers, and thus choose the right RF
2, choose the most suitable RFID reader
Readers and tags are the same, and the type and quantity of use must be determined by research supply. For example, the requirement is to manage the inventory in and out of the warehouse, and the reader can be installed on the door of the terminal where the goods enter and exit. If the requirement is to manage the product for a particular customer, then the reader should be installed not only on the hatch, but also on the truck. If the requirement is to control the retail shelf, fixed or handheld devices can be used to facilitate automatic outbound logging and counting.
In addition to understanding the requirements of the RFID system deployed on the reader, the reader must also understand the characteristics of the reader. The model of the reader is determined based on where it is in the supply chain and the purpose and location of the RFID reader. Choosing the right reader is critical to the successful implementation of other tasks. If the reader purchase strategy is reasonable, you can achieve twice the result with half the effort.
The writer can read tag information of different frequencies, and has the function of filtering data and executing instructions, but the price is relatively high, and the readers with less functions are cheaper. In a specific operation, sometimes multiple readers are required to read the tag information of the same model. For example, when reading the tag information on the transmitting device, a simpler reader can be selected. But if the retailer's products come from different suppliers, you need to use a multi-function reader to get the information of the goods in different labels.