METHOD FOR CONTROLLING COMMUNICATION BETWEEN A RECORDING UNIT AND A SPEED SENSOR OF A TACHOGRAPH SYSTEM OF A MOTOR VEHICLE AND CORRESPONDING TACHOGRAPH SYSTEM AND RECORDING UNIT FOR SAID TACHOGRAPH SYSTEM

摘要

The invention relates to a method for controlling communication (20) between a recording unit (12) and a speed sensor (13) of a tachograph system (11) of a motor vehicle (10), wherein the recording unit (12) repeats a command (18) to each Transmits speed sensor (13) and receives response data (19) for the command (18) from the speed sensor (13), the recording unit (12) waiting for a predetermined waiting time (26) between the transmission of successive commands (18). The invention provides that the recording unit (12) sends a request command (27) to the speed sensor (13) before sending out the first of the commands (18), the request command (27) asking which pause duration (29) the speed sensor ( 13) at least between two commands (18), and if the speed sensor (13) provides duration data (28) relating to the pause duration (29) in response to the request command (27), the recording unit (12) depends on the respective waiting time (26) from the duration data (28).