| 摘要 |
PURPOSE:To obtain an intensity wiring device having high accuracy and high reliability with a low cost, by feeding a high-frequency pulse to a terminal controlling part from a center controlling part with use of an optical fiber for a signal line and converting the pulse into an analog value through the terminal controlling part to compare it with the output of a terminal device. CONSTITUTION:For an intensive wiring device of a car, a high-frequency pulse is fed to terminal controlling parts 3A-3E from a center controlling part 2 via an optical fiber 1. Each terminal controlling part counts the pulses and compares the counting- value with a proper number showing the number of the terminal controlling part. When coincidence is obtained from this comparison, a pulse signal is converted into an analog value. This converted analog value is compared with the output value of analog sensors of analog devices 4A-4E, and the coincidence obtained between both values is sent back to the controlling part 2 to discontinue the transmission of the high frequency pulse which is supplied from the part 2. The terminal controlling part controls digital devices 5A-5E with the pulse signal. The part 2 detects the output value of the analog sensor from the number of high-frequency pulses transmitted. With use of an optical fiber for a signal line, the effect of electric wave noises is eliminated to increase the reliability. |
