Abstract:
A tachograph includes at least one chip card reading unit and, at least one chip card with secure memory. Secured data transmission can be fed to the at least one chip card reading unit. On the at least one chip card, at least one user-defined piece of identification information is securely stored which is independent of a specified piece of identification information for a specified operation of the tachograph. The tachograph is constructed so as to authenticate the at least one chip card in accordance with the at least one piece of user-defined identification information, and to read data securely from the at least one chip card and/or to store data securely on the at least one chip card.
Abstract:
In a method for controlling a display (4) of a tachograph (DTCO) which can be connected to data memories (7) that are associated with defined groups, an ergonomic control of the complex functionality of a digital tachograph is provided while requiring little space. Individual groups are associated with defined functional groups or dialogs of the display (4) and the operational controls (3). The tachograph (DTCO) identifies the group the data memory (7) is associated with and then displays a selection of functional groups that can be selected by means of operational controls (3). The display (4) displays only functions and functional groups that are associated with the group of the data memory (7).
Abstract:
A data processing arrangement, in particular a tachograph for a motor vehicle has a control device and at least one memory. The traceability of an error arising during the data processing arrangement operation can be better guaranteed. At least one partial area of the memory is embodied in the form of a sequence memory and a control device is constructed such that sequences of the data processing arrangement or of the tachograph are recorded in the sequence memory, wherein the sequence memory is provided with at least one ring memory which is organised such that an oldest input is overwritten by a new input, respectively. Thus, it is made possible to record a plurality of sequential events leading to a substantial error in the sequence memory such that the size of the memory is increased within economically acceptable limits during a long operation of the arrangement.
Abstract:
An integrated circuit (1) is provided with function modules (2) which comprise a central processing unit (4) for treating data and executing a program and a cache memory (5). Until now, it was complicated and costly to ensure the manipulation security of the modules. The function modules (2) comprise an encoding unit (6) for data encoding and decoding.
Abstract:
The aim of the invention is to prevent the plate contacts of chip cards from wearing as a result of vibrations that occur during the operation of a vehicle. To achieve this, the spring contacts of the read/write set of contacts in a holding device for chipcards are separated from the plate contacts of a chip card that has been inserted into the holding device, for a period, during which no trip or driver-related data is transmitted and said contacts are closed for only a relatively short time, i.e. during the reading of the chip card data into the relevant data recording device and during the writing of recorded data to the chip card. The holding device is configured in such a way that the relevant chip card remains inaccessible when the contacts are separated.