| 摘要 |
PROBLEM TO BE SOLVED: To improve a noise proofing property by partial optical communication in a network by matching driving states of two electric buses connected by an optical fiber with each other. SOLUTION: A bus 20a to connect nodes 30a, 30b is connected with a bus 20b to connect nodes 30c, 30d with optical bus bridge devices 10a, 10b by the optical fiber 50. ON states of the buses 20 (20a, 20b) are observed in a stand-by mode when the bus 20 is not driven by the optical bus bridge devices 10 (10a, 10b). When the bus 20a is changed to the ON state by being driven by the node 30a, the stand-by mode is transferred to an optical output mode and light is outputted from a photoelectric transducer 13a to the optical fiber 50. When the light outputted from the optical fiber 50 is received, the optical bus bridge device 10b is transferred from the stand-by mode to the bus drive mode and the state of the bus 20b is made coincide with that of the bus 20a by performing electric output from a bus driver circuit 11b by the optical bus bridge device 10b. The driving states of the buses 20a, 20b are fetched by the nodes 30b, 30c, 30d. |
