| 摘要 |
PURPOSE:To attain smoothly and quickly the reorganization of a line by making a device having the higher priority hold continuously a token when there exists plural transmitters holding the token. CONSTITUTION:Plural transmitters 10 are connected with double loop state transmission lines 11, 12 whose transmitting directions are opposite to each other and the right of transmission is controlled by receiving a token existing only one in the system. If there exists plural devices 10 holding the token, the system is designed that the device 10 having the higher priority can hold continuously the token in accordance with the priority of the devices 10. As a result, the reorganization of the lines is attained smoothly and quickly without providing especially a transmitter for supervisory control and a part disconnected by the line reorganization is minimized in number. |
