| 摘要 |
PURPOSE:To reduce the data collision by dividing plural slave stations into groups, assigning the transmission time to respective groups, reporting the number of transmission data from each of slave station group and monitoring the reported amount of traffic by a master station to divide slave stations to groups again when the amount of traffic exceedes a prescribed value. CONSTITUTION:Slave stations are divided into a group A constituted of slave stations a1, a2, a3..., a group B constituted of slave stations b1, b2, b3..., and a group C constituted of slave stations c1, c2, c3... which are equal in traffic amount, and respective groups transmit data to a master station R at preliminarily determined times different from one another. A traffic estimating circuit 3a of the master station R calculates the total sum of time slots required for data transmission of each group; and if groups are different in data congestion, a grouping management table 3b divides slave stations to groups again to eliminate this difference. |
