Modbus ASCII - This is used in serial communication and makes use of ASCII characters for protocol communication. The RS-485 interface communication is usually used for this type. Modbus messages are framed (separated) by idle (silent) periods. A Modbus RTU message must be transmitted continuously without inter-character hesitations. Modbus RTU is the most common implementation available for Modbus. The RTU format follows the commands/data with a cyclic redundancy check checksum as an error check mechanism to ensure the reliability of data. Modbus RTU - This is used in serial communication and makes use of a compact, binary representation of the data for protocol communication.
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