| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wide area monitoring control system realizing stable data communication. <P>SOLUTION: In the wide area monitoring control system, one master station device M collecting data by polling and a plurality of slave station devices S having functions operating as relay stations are connected through a specified small power radio network. The master station device M has a plurality of communication path patterns including at least one slave station device S as the relay station for all the slave station devices S, selects the communication path pattern having the first priority and gives a data transmission request to the prescribed slave station device in the first data collection. When data cannot be received from the prescribed slave station device within data reception waiting time, the communication path pattern having the second priority is selected and the data transmission request is given to the prescribed slave station device S in the second data collection. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
