| 摘要 |
PROBLEM TO BE SOLVED: To hardly cause malfunction and reduce the power consumption of changing signal power depending on a noise level from a noise generating source. SOLUTION: A transmitter side electronic controller 11 and a receiver side electronic controller 12 receive a signal denoting an operating state of a load 14 such as an engine and other electronic controller 15 acting like a noise generating source. When the amount of noise increases, the transmitter side electronic controller increases a voltage of a communication buffer 23 by using a changeover switch 22, and the receiver storage device electronic controller increases a pull-up voltage of termination resistors 37a, 37b by using a changeover switch 32, selects resistors with lower resistance among termination resistors 37a, 37b; 38a, 38b by using changeover switches 35, 36 so as to increase a threshold voltage of the communication buffer 33 thereby preventing malfunction. When the noise amount decreases, the transmitter and receiver side electronic controllers decrease each voltage and select resistors with high resistance so as to reduce the power consumption. |
