| 摘要 |
PURPOSE:To improve the transmission efficiency, by shifting the right of the primary station performing system management based on the predetermined priority. CONSTITUTION:Stations A1-An provided with a microprocessor are connected in loop via a transmission line. The priority of the stations A1-An is taken as A1>A2...>An. Suppose that the station A1 is the primary station. When the transmission of the station A1 is finished, the station A1 makes polling to other stations, and inquires about the request of the primary station. When the stations A2 and An request the data transmission, the stations A2, An return the request of the right of the primary station, the station A1 compares the priority of the station returned for the request and gives the right of the primary station to the station A2 having higher priority. |
