| 摘要 |
PURPOSE:To make it possible that a master station recognizes the connection order of slave stations only with fundamental transmission and reception functions, by receiving all frames, which pass each slave station, in the slave station and reporting stored addresses from the slave station to the master station and counting and comparing addresses from individual slave stations in the master station. CONSTITUTION:The master station transmits a polling signal directed to all slave stations from a transmitting part 12. Each slave station receives this signal by a receiving part 15 and switches a switch circuit 19, which transmits normally received signals to a transmitting part 16, to transmit a response signal. This response signal passes only slave stations in the downstream of this slave station. Each slave station stores addresses of frames of passing response signals in a storage part 18. These stored addresses indicate addresses of slave stations in the upstream of this slave station. After a fixed time elasped, the master station transmits a signal, which instructs slave stations to report lists of stored addresses to the master station, to all slave stations. When receiving this signal, each slave station transmits the stored address list as data. The master station receives address lists from individual slave stations and counts and compares them to recognize the connection order of slave stations. |
