TARIFFANORDAND MED DUBBELRIKTA ANSLUTH QUEEN.

摘要

The device for calculating the tariff, preferably intended for an electricity meter, exhibits a microprocessor (1), a data memory (6) and a bidirectional interface (8) for data transmission with a reader. A timing section (9) is activated for the duration of a data transmission and, via a logic circuit (10) blocks a predetermined storage area (6a) against being loaded with data. The data stored in the storage area (6a) and used for accounting purposes are thus protected against unintentional changes during the data transmission even if the software has corresponding errors. The function of the timing section (9) and of the circuit (10) can be checked in a simple manner. Objections with respect to the data security during a bidirectional data transmission are thus without substance. The device for calculating the tariff is therefore suitable for calibration. …IMAGE…