Card reader for security system

Abstract From the Canadian patent

Abstract of the Disclosure, There is disclosed herein an improved card reader for a security system utilizing a central controller and a plurality of card readers for controlling traffic through critical doors in a facility. During normal operation the card readers read card data and send it to the central controller. The central controller makes the decision whether to grant or deny access based upon a comparison of the card data and data kept in memory regarding persons who are authorized access to certain areas. The central controller then sends a "Go" or "No Go" message i.e. whether or not to grant access, to the reader after the access decision is made. The improved reader includes …