| 摘要 |
PURPOSE:To omit the circulation of a transmission right and to improve the use efficiency of a line by forming a priority field in a transmission frame and determining the most prior station on the basis of said field. CONSTITUTION:Priority information P1 is circulated to plural stations rinked like a loop, the most prior station is determined out of stations generating transmission requests and a priority field P2 is formed in a frame FR including transmission data transmitted from the most prior station. When the frame FR is circulated and transmitted to respective stations, stations having transmission request turn on an assigned bit in the field P2, and at the completion of transmission of a transmitting station, the most prior station is selected from the field P2 to apply the transmission right to the station, so that the most prior station executes transmisson. Consequently, the circulation of the loop can be omitted by the one circulation and the using efficiency of the line can be improved. |
