| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multiplex transmission device for vehicles that reduces the bus occupancy rate of data and efficiently transmits data of plural communication units. SOLUTION: A data transmission control part 23a judges whether or not there is any change in each vehicle data and sets in one communication frame in turn updated data or data before updating depending on whether or not there is any judged data change. An update bit setting part 25a assignes each update bit for indicating whether or not there is updated data to each data and sets it in the communication frame. A frame bit setting part 26a sets a frame bits which indicates that at least one datum of the whole data in the communication frame is updated, while a transmission and reception part 21a transmits the communication frame including each data, each update bit and the frame bit, and receives the communication frame from other communication unit.</p> |
