| 摘要 |
A wireless access control system having a microcontroller, a field generator, an access card reader, a proximity detector, and a self-contained energy source. Energy demands are reduced by maintaining the reader and field generator in a powered off state until the proximity detector detects the possible presentation of an access control card. The microcontroller then activates the field generator and card reader for a predetermined time period for obtaining data from the control card. If data is received, the system determined whether to grant access, or transmits the data to a host for determination whether access should be granted, and then operates a security mechanism accordingly. If data is not received within the time period, the field generator and reader are power off until the next proximity detection.
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