what are RFID tags？A radio-frequency identification system uses tags, or labels attached to the objects to be identified.
A radio-frequency identification system uses tags, or labels attached to the objects to be identified.Two-way radio transmitter-receivers called interrogators or readers send a signal to the tag and read its response.
Tags may either be read-only, having a factory-assigned serial number that is used as a key into a database, or may be read/write, where object-specific data can be written into the tag by the system user. Field programmable tags may be write-once, read-multiple; “blank” tags may be written with an electronic product code by the user.
The original tag classes were first developed by the MIT Auto-ID Center. The oldest class 0 and 1 later passed onto EPCglobal as a basis to create the newer standard of EPC Gen 2, the full definitions of the remaining newer classes are still under development. What are RFID tags classes or standards, Below shows a brief description on each available class currently:
Class 0: Generation 1, factory preprogrammed read-only passive tag
Class 1: Generation 1 and 2, Read-only passive tag similar to class 0 and has one-time field programmability
Class 2: Passive tag with read-write capability
Class 3: Semi-passive tag with read-write memory, onboard sensor and an incorporated
battery to provide increased coverage.
Class 4: Read-write active tag with integrated transmitter for communication using the battery onboard.
Class 5: Class 4 tags that provide additional circuitry to communicate with or provide power to other tags.
