Radio Frequency Identification (RFID): Definitions(some of the of terms used in RFID technology)A Primary list of RFID TermsProgramming a Tag
1. Writing data to an RFID tag.
This is sometimes called "commissioning a tag". Protocol
A set of rules that govern communications systems.
See Air-interface protocol for additional related information. Proximity Sensor
A device that detects the presence of an object and signals another device.
Proximity sensors are often used on manufacturing lines to alert robots or routing devices on a conveyor to the presence of an object. They can be used in RFID systems to turn on readers. Radio frequency (RF)
A system that communicates over a radio link between a data source and a scanner or reader.
When used in the context of theft detection systems, it refers to a system that uses tags that can only be turned on and off. Radio Frequency Identification (RFID)
1. A method of identifying unique items using radio waves.
Typically, a reader communicates with a tag, that holds digital information in a microchip; however, there are chipless forms of RFID tags that use material to reflect back a portion of the radio waves beamed at them. The tags have storage capacity for at least an identification number. Range
The distance at which successful reading or writing can be accomplished.
Read
1. The process of retrieving data stored on an RFID tag by sending radio waves to the tag and converting the waves the tag sends back into data.
2. The extraction, decoding, and presentation of data from a tag. Reader
1. A device used to communicate with RFID tags.
The reader has one or more antennas, which emit radio waves and receive signals back from the tag. The reader is also sometimes called an interrogator because it "interrogates" the tag. 3. A device that extracts and separates the information from the tag. Reader Field
The area of coverage.
Tags outside the reader field do not receive radio waves and can't be read. Reader Talks First
A means by which a passive UHF reader communicates with tags in its read field.
The reader sends energy to the tags but the tags sit idle until the reader requests them to respond. The reader is able to find tags with specific serial numbers by asking all tags with a serial number that starts with either 1 or 0 to respond. If more than one responds, the reader might ask for all tags with a serial number that starts with 01 to respond, and then 010. This is called "walking" a binary tree, or "tree walking". See Singulation for additional relevant information. Reader-writer
A device that can not only read information but also write new information to a tag.
Read-only Tags
1. Tags that contain data that cannot be changed unless the microchip is reprogrammed electronically.
2. Tags that can only be read because they were programmed at the factory. Read Range
1. The distance from which a reader can communicate with a tag.
Active tags have a longer read range than passive tags because they use a battery to transmit signals to the reader. With passive tags, the read range is influenced by frequency, reader output power, antenna design, and method of powering up the tag. Low frequency tags use inductive coupling, which requires the tag to be within a few feet of the reader. Read Rate
1. Often used to describe the number of tags that can be read within a given period.
The read rate can also mean the maximum rate at which data can be read from a tag expressed in bits or bytes per second. Read-Write Tag
1. An RFID tag that can store new information on its microchip.
These tags are often used on reusable containers and other assets. When the contents of the container are changed, new information is written to the tag. Read-write tags are more expensive than read-only tags. Information can be added or changed. List of Radio Frequency Identification or RFID articles.If there are any numbers below, use them to see other pages in this unit.
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