| 摘要 |
PURPOSE:To prevent the erroneous reception due to the delay of a branching device, by pairing optical fiber cables to constitute a network of a system and detecting a collision and the state of the network at the same time by a transmitting terminal. CONSTITUTION:Paired optical fibers 11 and 12, optical fibers 13 and 14, and optical fibers 15 and 16 through which optical information is transmitted are connected to a branching device 10 to constitute the communication network of the bus system. Photoelectric converters 17, 19, and 21 which convert optical information to an electric signal are connected to fibers 11, 13, and 15, and electrophoto converters 18, 20, and 22 which convert the electric signal to optical information are connected to fibers 12, 14, and 16. Outputs of converters 17 and 21 are supplied to an OR circuit 24, and the output of the circuit 24 is applied to the converter 20, and outputs of converters 19 and 21 are applied to an OR circuit 25, and the output of the circuit 25 is applied to the converter 18. Outputs of converters 17, 19, and 21 are applied to the converter 22 through an OR circuit 26. Thus, the erroneous reception due to the delay of the branching device 10, and the collision and the state of the network are detected at the same time by the transmitting terminal. |
