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The aim of this work is to develop a remote supervision system that establishes communication between the electronic control unit of an electricity generating set and a SCADA supervision programme. The supervisory system was developed for this project in the PHP language, running remotely on a server machine. A Modbus TCP/IP master developed in Java language is also implemented on the server. The information is stored in an SQL database, making the data available to the supervisory system. The Modbus RTU bus data collection hardware was designed on a printed circuit board, where the microcontroller and the circuits, both the power supply and those used for communication between the microcontroller and the bus, are arranged. Sockets with information in the Modbus TCP/IP protocol are used to send information from the generators, using an IEEE 802.11 network. The system developed was validated with tests on an electricity generator, which is presented in this paper. The results obtained in the tests showed that the system is capable of performing the operations it was designed to perform.