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Glossary of RFID Terms

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See RFID tag
Tag excitation device
A term coined by the RFID Alliance Lab to refer to a device that sends signals to the tag regardless of the make or manufacturer. TED is used to measure the response of tags scientficially.
Tag talks first
A means by which a reader in a passive UHF system identifies tags in the field. When tags enter the reader's field, they immediately communicate their presence by reflecting back a signal. This is useful when you want to know everything that is passing a reader, such as when items are moving quickly on a conveyor. In other cases, the reader wants to simply find specific tags in a field, in which case it wants to broadcast a signal and have only certain tags respond. (See Reader talks first.)
Tamper-evident tag
An RFID tag that communicates to a reader when a package or container has been opened without authorization.
See time division multiple access
See tag excitation device
Time division multiple access
A method of solving the problem of the signals of two readers colliding. Algorithms are used to make sure the readers attempt to read tags at different times.
Track and trace
The process of retrieving information about the movement and location of goods.
A device that both transmits and receives radio waves.
A radio transmitter-receiver that is activated when it receives a predetermined signal. RFID transponders come in many forms, including smart labels, simple tags, smart cards and keychain fobs. RFID tags are sometimes referred to as transponders.
Type A Reference Interval (TARI)
The duration of a pulse of energy sent to UHF EPC Gen 2 tags to indicate a 0 in binary code. EPC Gen 2-compliant readers use pulse interval encoding (PIE) to code binary data. A binary '0' is indicated by a short, high-level pulse, followed by a low pulse of equal length. The length of a TARI can vary from 6.25 to 25 microseconds.


If there is a term that should be in this glossary but isn't, please let us know by sending e-mail to .

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