The ADS5200 provides a Clock&Data/Wiegand interface between a card reader and the advanced central controller (AC5102 or AC5200) for one card reader. When a cardholder presents an access card at an entry or exit reader the ADS5200 reader interface interprets the encoded information and sends this data to the controller. The controller then checks the validity of the cardholder? and if the appropriate permissions have been assigned? the controller sends a message back to the reader interface allowing it to unlock the door and provide passage. It can also report the status of the door (locked or unlocked) at any time. Note: The ADS5200 does not have an RS485 interface for card readers. It supports Clock&Data or Wiegand readers only.