| 摘要 |
<p>A device used in a vehicle comprises a vehicle-mounted device that operates with reference to the vehicle ground, which is the negative polarity side of a battery power supply, and that transmits and receives digital communication signals; an impedance element an end of which is connected to the vehicle ground and the other end of which is a circuit ground; a controlled circuit that operates with reference to the circuit ground; a control part that operates with reference to the circuit ground, controls the controlled circuit and outputs a digital communication signal to be transmitted to the vehicle-mounted device; and a communication interface circuit that operates with reference to both the vehicle ground and the circuit ground, cancels a potential difference, which occurs, due to the impedance element, between the vehicle ground and the circuit ground, and that enables a two-way communication between the vehicle-mounted device and the control part.</p> |
