| 摘要 |
<p>An access control device operated by a magnetically coded card. A self-contained unit with card receiving slot, card reader, memory and logic and control circuitry in a single small package. An access control device providing a unique number for each issued card and including a programmable memory providing storage for the code of each card permitted access and of each card the permission of which is subsequently voided. An access control device of a size suitable for positioning at the location where access is being controlled and having a capability of several thousand different card codes, without requiring a central station or wiring interconnections between devices or between the device and a central station.</p> |
