FIELD: measuring instrumentation.
SUBSTANCE: invention refers to a method of tachograph function activation. The method involves the following stages: connection (31) of external data carrier (20) to interface (110) of at least one tachograph (10), where external data carrier features at least one function activation instruction (210, 211) readable by the control unit; authentication (33) between external data carrier and control unit; activation (35) of function related to at least one instruction (210, 211); function correlation to the first function group (103) and disruption of connection (31) between external data carrier and interface of at least one tachograph; where at least one instruction includes another function activating another interface of the tachograph; and the function can be activated at a number of tachographs where this number is determined by the difference between a number set from and stored at the external data carrier and a number of activations already performed by the external data carrier.
EFFECT: possible tachograph function activation per customised requirements.
7 cl, 3 dwg
