Tariff arrangement with secure bidirectional interface

Details Tariff arrangement with secure bidirectional interface Tariff arrangement with secure bidirectional interface

G - Physics

01

R

354/21

G01R 35/00 (2006.01) G01R 21/133 (2006.01) G11C 7/24 (2006.01)

Patent

CA 2025249

ABSTRACT OF THE DISCLOSURE A tariff arrangement which is preferably intended for an electricity meter comprises a microprocessor, a data memory and a bidirectional interface for transfer of data with a read-out device. For the duration of a data transfer operation a timing member is activated and by way of a logic circuit inhibits a predetermined memory region to prevent data from being written thereto. The data which are stored in the memory region, for charging purposes, are therefore protected from unintentional alterations during the data transfer operation, even if the software should have corresponding defects. The function of the timing member and the logic circuit can be checked in a simple manner. Objections in regard to data security during a bidirectional data transfer are accordingly unfounded. The tariff arrangement is therefore calibratable.

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