| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a multiplex transmission device for vehicles for reducing bus occupancy rate of data and for efficiently transmitting data from plural communication units. SOLUTION: In each of plural communication units 1a, 1b and 1c that are connectable to a bus 3, transmission and reception parts 21a and 21b mutually transmit receive vehicle data to/from communication units other than their own communication unit, while unit detection parts 27a and 27b detect whether or not there is a bus connection of a communication unit of a called party in other communication units. Data transmission control parts 25a and 25b control the transmission and reception parts 21a and 21b in such a way as to allow the vehicle data to be transmitted to the communication unit of the called party when connection of the communication unit of the called party to the bus is detected, and control the parts 21a and 21b so as to stop transmitting the vehicle data to the communication unit of the called party when the connection of the communication unit of the called party to the bus is not detected.</p> |
