| 摘要 |
A system (10) for monitoring parked vehicles, comprising a portable parking tag (11) for each vehicle and a reading device (12). The portable parking tag (11) includes a non-contact data communications circuit (15) for effecting data transfer via mutual electromagnetic coupling with the reading device (12), a memory (17) coupled to the data communications circuit (15) for storing at least one parking parameter, and an antenna (22) coupled to the data communications circuit (15) for transmitting a first signal representative of each parking parameter. The reading device (12) includes an antenna (25) for receiving the first signal, a reading circuit (26) coupled to the antenna (25) and responsive to the first signal for reading each parking parameter stored in parking tag memory (17), validity verification means coupled to the reading circuit (26) and responsive to the first signal for generating a validity signal, and output means (28, 31) coupled to the validity verification means and responsive to the validity signal for producing a visual or audible output. <IMAGE> |
