| 摘要 |
PURPOSE:To grasp the information transmitting state of a car by providing a display device displaying the state of an information transmission path to the driver seat. CONSTITUTION:When a control command from a control command device is transmitted to a central station 3, a transmission processing section 12 activates a controller and also outputs an electric signal where control information is added with a clock signal. This electric signal is converted into an optical signal by an electrooptic converter 11, transmitted to a transmitter terminal station 4 through an optical fiber 5a, converted into an electric signal by a photoelectric converter 10 and transmitted to a transmission processing section 12. Thus, the terminal station 4 is activated to activate other controller and output an electric signal to the electrooptic converter 11. When the information transmission is interrupted, terminal stations 4 at both sides putting a faulty optical transmission line 5 between allow its transmission processing section 12 to conduct the transmission line changeover and the central station 3 displays the state of the transmission line to a display device. |
