Small JAVA-tool to calculate CRC (Cyclical Redundancy Checking) for
Modbus-RTU.
The CRC-Field is appended to a Modbus-RTU Frame
Byte 0: Slave Address
Byte 1: Funktion Code
Byte 2-254: Data
Byte 2-254: CRC Low Byte
Byte 3-255: CRC High Byte
The Field CRC-Low and CRC-High is being generated, using all previous bytes.