| 摘要 |
A consumer meter 2 is located at a consumer's premises and a fraud meter 4 is located remotely therefrom. Supplied energy is first metered by the remote fraud meter 4 and is then measured by the consumer meter 2. The fraud meter 4 requests from the consumer meter 2 an identity code and key which it uses to encrypt the value of the measured energy prior to transmitting it to the consumer meter at the request of the consumer meter. In this way the communications link being in digital form is immune to RF interference and possible tampering by the use of RF devices. The energy values stored in the consumer's meter 2 and the fraud meter 4 may be read directly from the meters or may be transmitted, for example, via mains signalling back to the energy supply for analysis. <IMAGE> |
