COMMUNICATION SYSTEM, COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMMUNICATION PARAMETER DETERMINING METHOD

摘要

Provided are a communication system, communication device, communication method and communication parameter determining method enabling higher speed communication and a reduction in the impact of ringing. If transmission data is dominant, a transmission unit (17) in an ECU (1) outputs, to a communication line (5), a signal having a specific signal level spanning a pulse width (Tp) which is shorter than the transmission time for one bit, and then stops the output of the signal to the communication line (5), creating a high impedance state, and if the transmission data is recessive, the transmission unit (17) creates a high impedance state without the output of the signal to the communication line (5). Also, a reception unit (18) in the ECU (1) samples the signal level of the communication line (5) across a sampling period (Td), calculates the average value of the sampled signal levels, and makes a dominant/recessive determination according to whether the calculated average exceeds a threshold value or not.