Operation of a data reading device for a tachograph

Abstract

Title: Operation of a data reading device for a tachograph The invention relates to a method for operating a data reading device (12) for a tachograph (10), the data reading device receiving electrical energy from the tachograph, the tachograph having a standardized reading interface (14) which provides a standardized maximum electrical current at a predeterminable operating voltage, in which an interface connector (16) of the data reading device is coupled to the reading interface of the tachograph, a memory unit (18) receives tachometer data to be read from the tachograph via the interface connector and stores them, in which a mobile radio unit (20), in a transmission mode, transmits the tachometer data,wherein a control unit (22) controls the transmission mode of the mobile radio unit such that the tachometer data are transmitted at at least one predefined time and / or during at least one predefined period, and wherein an energy storage unit (24) stores the electrical energy received from the tachograph. According to the invention, the operating voltage or a supply voltage is detected by means of a voltage sensor (82, 84) and compared with a voltage comparison value, the electrical energy supply to the data reading device (12) being interrupted. (Figure 5),