| 摘要 |
PURPOSE:To improve reliability of data transmission and signal processing, by sending out a periodical polling signal provided with an apparatus address and a data from a master station, executing each processing by an input device and an output device corresponding to the address, and controlling the transmission by the master station. CONSTITUTION:Plural slave stations 21-24 are connected to a master station 1 for controlling the transmission, through a transmission line l, and by the slave station 21-24, communication is executed to an input device or an output device. The slave stations 21, 23 which communicate with this input device receive a periodical polling signal provided with an apparatus address from the master station 1, and send out a data to which a corresponding address is inputted, to the master station 1 in accordance with its polling signal. Also, the slave stations 22, 24 which communicate with the output device receive a periodical polling signal provided with an apparatus address and a data, communicate with the output device of a corresponding address in accordance with its polling signal and process it. In this way, the whole transmission if controlled by the master station 1, and reliability of data transmission and signal processing is improved. |
