| 摘要 |
<p>Provided is an access control system, including one or more locks, each includes a receiver for receiving a first signal and a processor module for decoding the first signal and for controlling operation of the lock; one or more portable access control units for delivering said first signal to one of said receiving modules when in proximity to a respective lock; and a central system controller for delivering to said control unit at least one second signal; said first signal being generated by said portable access control unit based on said second signal.</p> |
