PROGRAM, METHOD, APPARATUS AND SYSTEM FOR REMOTE-CONTROL MONITORING, AND RECORDING MEDIUM FOR PROGRAM

PROBLEM TO BE SOLVED: To provide a system for remote-control monitoring, which sends an accurate data by reducing a transmission load. SOLUTION: The system for remote-control monitoring implements communication by using a connectionless transmission when a low-order station of remote-monitoring control apparatus 200 transmits an apparatus control information such as measurement data to a high-order station of control monitoring apparatus 100. In order to secure reliability in communication, the system transmits the same data from the low-order station to the high-order station via an A route and a B route for each data by using an A port and a B port, both of which have the same addresses, and also transmits twice the same data in sequence via each route. The high-order station selects a latest data as a valid data and discards the other as an invalid data, both of which are the received data by the station. Furthermore, the high-order station also discards the received data, which overrides a specified normal sequence, and requests the low-order station to transmit again the data which is not received if the station fails to recover the data. COPYRIGHT: (C)2004,JPO