Table of Contents Bus Hardware Software This is an old revision of the document! Bus RS485 will be used as the principal bus. Hardware IO Controller Sensor Nodes Software In order to communicate between the nodes, the MODBUS RTU protocol will probably be used. Addressing If possible, the addresses could be dinamically addressed using some discovery protocol. This seems really to realize on modbus and thus, some DIP switch could allow the user to set nodes addresses. Since the modbus adressing can go up to 255, a 8 input DIP switch will use 8 GPIOs.