| 摘要 |
A local communication system includes a plurality of stations exchanging control messages and source data via a ring network. One of the stations is designated a master station with the other stations designated as slave stations. On start-up, a "Set Position" message is generated by the master station and modified by each station in turn, so that each station can determine its ring position. In the event that start-up is unsuccessful due to a break down at some point in the ring, the slave station immediately following the break will become temporary master, and will generate a "Set Position" message prior to shut down. By this mechanism, the master station is able to store an indication of the relative position of the temporary master station in the network, so that the fault may be more easily located.
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