| 摘要 |
A main station has a first timer device and each of a plurality of peripheral stations connected to the main station, through a communication line, has a second timer device. Data is transmitted between each of the plurality of peripheral stations and the main station, with every unit period of communication and the order of the communication therebetween being predetermined. In the unit period of communication mentioned above, an initializing data signal is transmitted from the main station to each of the peripheral stations and a data signal is transmitted between the main station and each peripheral station every individual communication period of each of the peripheral stations.
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