| 摘要 |
PURPOSE:To reduce the load of a host computer by using both a contention system and a poling system and controlling the switching of both the systems. CONSTITUTION:When receiving a communication request of which requesting terminal is unkown in the contention mode, the host computer inhibits respective terminals to generate successive communication requests. When the contention mode is turned to the poling mode, the host computer inquires respective terminals to check the terminal generating said request, and then executes communication with the terminal concerned. After poling the whole terminals, the host computer releases the whole terminals from the inhibition of the communication request generation and returns to the contention mode again. Consequently, it is unnecessary for each terminal to execute retransfer processing at the time of collision, reducing the load of the host computer.
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