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Access Cards

All modern access cards in use today are contactless. They have a chip and antenna inside card body. Something like this:

There are two contactless technologies in usage today. RFID and NFC. Difference is in frequency used and working distance. Other than that effect is about the same. After card is read by the reader, reader sends a card number in Wiegand format to the door controller. Door controller runs 24/7 and makes instant decision is person with card allowed to access that particular door at that day and time. Door gets unlocked or not. According to pre-programmed rules.