PROXIMITY CARD ACCESS TECHNOLOGY FOR LIFT
Proximity card is also known as contactless integrated circuit devices used for security access or payment systems. It can refer to the older 125 kHz devices or the newer 13.56 MHz contactless RFID cards, most commonly known as contactless smartcards.
Modern proximity cards are covered by the ISO 14443 (Proximity Card) standard. Proximity cards, also known as prox cards have a range of 0-3 inches in most instances, allowing the user to leave the card in one's wallet, or purse. The price of the cards is also reasonably low (affordable), allowing them to be used in many applications such as identification cards, keycards, payment cards and public transit fare cards.
Design wise, proximity cards use an LC circuit. An IC, capacitor, and coil are connected in parallel. The card reader presents a field that excites the coil and charges the capacitor, which in turn energizes and powers the IC. The IC then transmits the card number via the coil to the card reader. The card readers communicate in Wiegand protocol that consists of a data 0 and a data 1 circuit. The earliest cards were 26 bit. As demand has increased bit size has increased to continue to provide unique numbers. Often, the first several bits can be made identical. These are called facility or site code.
Intellivator� Keyless Entry Access Control Systems have been used at many sites for the elevator industry. Intellivator� innovative systems are used to control access by requiring the user to enter an access code at a keypad (or present a proximity card) before a call can be registered. Applications include:
Inside the car - Restricts access to private floors At a landing - Restricts access to the car.
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