Remote monitoring system using a polling level table and a monitored station number table

摘要

A data transmitter/receiver of a centralized monitoring station transmits data and receives data from each of monitored stations. A polling level table stores polling levels calculated from request data level and transmission data level added to transmission data from the monitored stations. A monitored station number table stores the numbers of monitored stations to be polled with a polling-level equal to or greater than 2 in one polling cycle. A polling level determining unit determines polling levels to be transmitted to the respective monitored stations based on the contents of the polling level table and the monitored station number table. A data transmitter/receiver of each of the monitored stations transmits transmission data level corresponding to the polling level and transmission data with the added request data level to the centralized monitoring station.