FIELD: information technology.;SUBSTANCE: disclosed is a digital tachograph unit (TCO), having a constant voltage input (DIN), an ignition voltage input (ZIN), and an activation voltage input (AIN). A continuous power supply unit (VSD) is connected to the constant voltage input (DIN) and is designed to electrically supply a continuous supply region of the tachometre unit (TCO) depending on voltage at the constant voltage input (DIN). An operating supply unit (VSZ) connected to the ignition voltage input (ZIN) and the activation voltage input (AIN) is designed to electrically supply an operating supply region of the tachometre unit (TCO) depending on the voltage at the ignition voltage input (ZIN) and/or at the activation voltage input (AIN). A data processing module (MC1) associated with the continuous supply region is designed for performing data transfer through a first interface module (SM1) depending on the presence of supply voltage (VB) at the activation voltage input (AIN), which is associated with the operating supply region.;EFFECT: design of a system with a tachograph, which provides simple data transfer depending on continuous operating voltage supply.;14 cl, 2 dwg
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