In the RT-Middleware, a data-centric communication method between RT-Components(RTCs) called "Data Port" is provided. Many types of the data-centric communication schemes, which depend on both ends RT-Component properties such as execution method, data producer's/consumer's processing throughput and period and relationship between them, can be possible. In this paper, we discuss about the data-centric communication scheme between RTCs and its new architecture is shown.