| 摘要 |
System for providing verified information exchange between a read/write unit (2) and an electronic record carrier (4) which stores the information as digital data in a memory (38). The exchange of data is controlled by a microprocessor (6) in or coupled to the read/write unit, which monitors whether the data to be stored in the memory (38) is being accurately stored therein. The information carrier includes a tuned circuit (34, 36) which is connected to an input/output (39) of the memory through a switching transistor (32). When a logic "high" value is present at its base, the transistor short-circuits the tuned circuit and so it no longer resonates. The tuned circuit is inductively coupled to a detector (14) in the read/write unit, which thereby detects the resonant or non-resonant condition and provides a corresponding logic signal to the microprocessor which compares such logic signal with the logic value of the data then being recorded. Any discrepancy is thereby detected. The system may be used in hotels for room access control, recording of the costs of use of hotel facilities, and for mail and/or message reporting.
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