Rfid technology introduction

RFID(Radio Frequency Identification) from the 1980s a mature automatic identification technology. Due to the large scale integrated circuit technology maturity, the volume of the radio frequency identification system, and consequently before considerably reduced the stage to the practical application. It USES rf manner non-contact two-way communication, achieves the recognition of purpose and exchange data. It and earlier or early contact recognition technology different, the RFID system is the rf CARDS and literacy can be completed without contact between identification. So it can be in more extensive application of the occasion.

The typical rfid system includes two parts: they are rf card, reading and writing implement.

Rf card of several main module integration to a chip, complete with reading and writing implement communication, chip memory parts used to store the identification number or other data: memory capacity from a few bits to dozens of 1000 bits. Chip peripheral only connection antenna (and battery), can be used as the identity card or personnel goods identification card. Card encapsulation can have different forms, such as common credit card pour circles and forms of the form etc. And bar code, the same magnetic card or IC card or early identification technology, rf card compared with non-contact, long distance, suitable for bad work environment, can identify target motion, etc.

In most RFID system, reading and writing in - a region is formed energy is emitted depends on electromagnetic field, regional work frequency and antenna size. Rf CARDS after this area for signal detection to start reading through information and sending stored data. Literacy is usually provides a signal sent by a clock signal and rf card required enough energy, one of the clock signal make data synchronization, which simplifies the design of the system. Reading and writing implement receives card data error decoding and, after checking to decide data validity, then through RS232, RS422, RS485 or wireless means to send data to a computer network. Simple RFID products is a contactless IC card, and complex RFID products can and external sensor interface connection to measure and record the different parameters or even connect with GPS system to track objects.

Should say barcode, magnetic card, IC card, rf CARDS recognition technology has its own advantages and disadvantages, suitable for application occasion.