| 摘要 |
PURPOSE:To increase the data transmission time and then to secure the data transmission among the rest normal stations even in case the troubles occur at many stations including the control station by securing the function of the control station to the station which transmitted the control declaration command to other stations and at the same time forming the slave stations with the stations which received the control declaration. CONSTITUTION:Stations 5-1-5-n transmit the data to each other and then connected via sharing loop-type transmission line 4. These stations feature the both functions of the control and slave stations. Thus the self-station turns to the control station with transmission of the control declaration command declaring that it will be the control station in case the control station request is given for the self-station to be the control station or no polling command PA, PB... PZ, etc. requesting the data to the slave station from the control station is recieved from other stations within a fixed time. On the other hand, the other stations received the declaration form the slave station. As a result, the transmission can be shortened, and the data can be transmitted among the rest normal stations even if the troubles may occur at many stations including the control station. |
