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This paper presents some works made in the development of communications software for an embedded open core system. By using a Linux-based processor implemented on a FPGA, we are developing the appropriate software in order to implement a remote unit to be used in a telecontrol network. We present an analysis of the physical devices needed and a performance report of them. After that, we analyze the requirements of the telecontrol network and the possibility of re-using already implemented protocols in Linux instead of using standard telecontrol protocols.