Tariff arrangement with secure bidirectional interface

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

1990-10-10

1992-08-04

Lall, Parshotam S.

Boots, shoes, and leggings

364467, 395425, G07B 1500

Patent

active

051365146

ABSTRACT:
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.

REFERENCES:
patent: 4240146 (1980-12-01), Iles
patent: 4442492 (1984-04-01), Karlsson et al.
patent: 4539644 (1985-09-01), Adams et al.
patent: 4580039 (1986-04-01), Adams
patent: 4809185 (1989-02-01), Talmadge
patent: 4998203 (1991-03-01), Di Giulio et al.
A. Horlent et al., "A New Generation of Electronic Devices For Maximum Demand and Multi-rate Tariffs, With Manual or Automatic Local Read-out", Fifth International Conference on Metering Apparatus and Tariffs for Electrical Supply.

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