RFID ( Radio Frequency identification ) is a standard ,specifically a protocol, that defines how a network uses radio signals to communicate with a tag placed in or attached to an object , an animal, or person. The tag, called a transponder, consists of an antenna and a memory chip that contains the information to be transmitted via radio waves. Through an antenna, an RFID reader, also called a transceiver, reads the radio signals and transfers the information to a computer or computing device.
RFID tags are passive or active. An active RFID tag contains a battery that runs the chip's circuitry or magnetic chips both broadcasts a signal to RFID reader.
In Three steps we will demonstrate how RFID Works:
Step1: Motorist purchases an RFID transponder or RFID tag and attaches it to the vehicles windshield.
Step2: As the vehicle approaches the tollbooth, the RFID reader in the tollbooth sends a radio waves that activates the windshield-mounted RFID tag.
The activated tag sends vehicle information to the RFID reader.
Step3: The RFID reader sends the vehicle information to the lane controller .The lan controller, which is part of a local area network , transmits the vehicle information to a central computer the subtracts the toll from the motorists account. if the vehicle dose not have an RFID tag, a high-speed camera takes a picture of the license plate and the computer prints a violation notice, which is mailed to the motorist.
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