Experience with the modbus protocol

I want to acquire experience with the modbus protocol, also by simulation, in our office of a system of virtual installation (i.e. SCADA management of a wind farm) through free or evaluation SW, and integrate in this system, a CR1000 datalogger. Does anyone have suggestions?

Modbus is a communication protocol developed by Modicon systems. In simple terms, it is a method used for transmitting information over serial lines between electronic devices. The device requesting the information is called the Modbus Master and the devices supplying information are Modbus Slaves.
Modbus is transmitted over serial lines between devices. The simplest setup would be a single serial cable connecting the serial ports on two devices, a Master and a Slave. The data is sent as series of ones and zeroes called bits. Each bit is sent as a voltage.