FIELD: physics.
SUBSTANCE: at the start of transmitting data, a virtual image (VI) (VI) of the data memory unit (13, 14) is first stored in the memory unit (DMEM) of the tachograph (DTCO), and subsequent read and write access operations by the logic functional modules (FM) are first of all effected on the virtual image (VI) (VI) in the memory (DMEM), and a write operation is regularly effected by accessing the data memory (13, 14) on the data card (4, 5), during which the differences between the virtual image (VI) (VI) and the data memory (13, 14) are corrected. The invention also pertains to a method of using the tachograph (DTCO).
EFFECT: shorter accessing time when using the tachograph without damage to protection.
20 cl, 4 dwg
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