The basic function of the radio frequency tag reading and writing device is to read the data information in the radio frequency tag without contact.

 From a functional perspective, devices that simply implement contactless reading of radio frequency tag information are called readers, reading devices, scanners, and so on.

 Devices that simply write information into the radio frequency tag memory are called programmers, writers, etc.

 Devices that comprehensively have contactless reading and writing information in the memory of radio frequency tags are called readers, communicators, etc.

 

  Radio frequency tag information can be roughly divided into the following three types

 

(1) When the RF tag leaves the factory, the complete tag information has been written into the tag. In this case, the RF tag generally has a read-only function during the application process. In more cases, the read-only tag information is written in the production process of the radio frequency tag chip, that is, the tag information is written into the chip, so that each RF tag has a unique identification UID (such as 64Bits). In application, it is necessary to establish the correspondence between the unique UID of the tag and the identification information of the item to be identified (such as the license plate number). The read-only tag information is also written before the application, the complete tag information is written by a dedicated initialization device.

 

(2) The writing of radio frequency tag information is realized by wired contact, and this kind of tag information writing device is generally called a programmer. This contact-type radio frequency tag information writing method usually has the ability to be rewritten multiple times. For example, the writing of electronic tag information of railway freight cars currently in use is such a method. After the information is injected into the label, the writing port usually needs to be sealed to meet the requirements of moisture, water, and pollution resistance in the application.

 

(3) After leaving the factory, the radio frequency tag allows users to write data information into the radio frequency tag through a dedicated device in a contactless manner. This special writing function is usually combined with the radio frequency tag reading function to form a radio frequency tag reader. Radio frequency tags with wireless write function usually also have their unique rewritable UID. This kind of radio frequency tag tends to be a general radio frequency tag. In application, it can read only its UID or only the specified radio frequency tag memory unit (the smallest unit of one-time read and write) according to actual needs.

 

In the application, there are widely existing radio frequency tags that write once and read many WORM (Write Once Read Many). This concept of WORM includes both radio frequency tags with contact rewriting and radio frequency tags without contact rewriting. Such WORM tags are generally used in single-use occasions, such as air luggage tags, special ID tags, etc.

No matter what the situation, the write operation of the radio frequency tag should be carried out under certain authorized control. Otherwise, it will lose the meaning of the radio frequency tag to mark the item.