Control method for a remote supervisory control system

Claim 1

In a remote supervisory control system comprising a control desk operated by an operator, a single master station which receives signals from the control desk and a plurality of remote stations whose states are supervised and controlled by the master station, in which the master station has a buffer memory device for storing a selection signal selecting at least one from among the plurality of remote stations and an operation control signal for the selected remote station which are given by the operator through the control desk, a control method comprising: a first step of storing the selection signal originated by the operator in said buffer memory device, a second step of storing the operation control signal originated by the operator in said buffer memory device when it has been indicated on the control desk that the first step has been completed, the operation control signal corresponding to the predetermined remote station selected by the selection signal stored in said buffer memory device, a third step of transmitting the selectionsignal from the buffer memory device to the selected remote station when both the selection signal and operation control signal have been stored in the buffer memory device, a fourth step of transmitting a selection completion signal to the master station from the selected remote station, a fifth step of transmitting the operation control signal stored in the buffer memory device to the selected remote station when the selection completion signal from the selected remote station has been received by the master station.