arduino modbus

My project needs an Arduino Modbus project for energy monitoring. I require the Modbus RTU protocol to be implemented, and rs485 is inbuilt in arduino opta which is to be used to show the readings on the Serial output. i have the energy meter modbus mapping also but the code doesn't seem to work I am looking for someone who is experienced in working with Arduino and Modbus systems, to help us achieve successful control of our industrial processes.