| 摘要 |
POLLING NETWORK COMMUNICATION SYSTEM HAVING TRANSMISSION REQUEST REGISTRATION MEANS In a sequential polling type communication network system including a master station, a first channel, a second channel, and at least two slave stations, the master station includes request registration units for registering data transmission requests from slave stations during a data transmission by another slave station, and an interrupt polling unit for polling the slave station which has issued the data transmission request after completion of the data transmission or completion of a polling of a slave station, and the slave station includes a unit for responding to a polling during the data transmission, and transmits a data transmission request when data to be transmitted exists, and a for responding to the interrupt polling from the master station, and transmitting the data to the master station until the data transmission is completed.
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