The present invention relates to a data communication system between the equipment within a PC (PC), in a data communication system including a central controller to send and receive a local controller and, in communication with the local controller for controlling a predetermined mechanism, at the central controller, communication in a communication with the local controller is transmitted to the local controller is transmitted to the central controller is characterized in that the paths are different. According to the present invention, maintaining the existing data communication network and as is possible while all the information of each process, without affecting the reliability of communication by developing additional communication network can be managed and shared by the respective PCs.
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