Communication system comprising a data bus and a plurality of subscriber node,,, connected thereto, as well as a method for operating such a communication system

摘要

The present invention relates to a communication system (1), comprising a data bus (2) and a plurality of to the data bus (2) is connected to a subscriber node (3, 4), as well as a method for operation of such a communication system (1). Data frames (10) for the transmission of data in each case comprise a data field (14) and / or a control field (13) and a checksum field (15). A subscriber (3) has a highly accurate clock generator (5) (for example, more precisely, quartz, mems - resonator, etc.), and the other stations (4) have a clock generator (7) (for example, rc - oscillator or inaccurate quartz) with a lower degree of accuracy. During the operation of the communication system (1) are connected to the data bus (2) are directed to the calibration according to, and the subscribers (4) with the imprecise clock generator (7) receiving a calibration according to directional. The subscribers (4) with the imprecise clock generator (7) calibrating the imprecise clock generator (7) to a system clock (6) of the data bus (2) while taking into account in the received information contained calibration according to directional. In order to allow the calibration of such a communication system (1) and in order to accelerate the same time bandwidth on the data bus to save (2), it is proposed, any desired by way of the data bus (2) messages transmitted as a calibration according to the direction of the calibration of the system (1) to employ. For the calibration, in oscillator - periods (8) a distance (nopn) between an edge (40) in the data field (14) or in the control field ..