| 摘要 |
PURPOSE:To contrive the reduction of a line load by giving a data of line occupancy order to each slave station from a master station and allowing each slave station to recognize the transmission timing of its own station according to the sequence data when the transmission start command from the master station is received so as to send a data. CONSTITUTION:The master station 1 sends an initial command I and transmits a start command S. The initial command is the combination of station addresses and represents that a slave station 2 sends a data in the order. Both the commands I,S are sent to all the slave stations 2, 2... through a D line 3 from the master station 1. When the transmission is finished, the slave stations 2 send a data without command from the master station 1 sequentially. The data is sent to the master station 1 by using a U-line 3 and supervised by the function of a supervisory equipment in the slave stations 2.
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