AVR Modbus Serial RTU

The AVR Modbus RTU is a Serial modbus RTU which has 16 digital inputs and 16 digital outputs. It is based on the free-modbus project. The RTU uses the ATMEGA 128 microcontroller . The source code , the schematics and the hardware production files are available for free. This project was designed for my MSc graduation paper in 2010 @ the Technical Univercity of Sofia / Bulgaria