The messages’ simplicity ensures their reliability. Modbus RTU messages are a 16-bit structure with a CRC checksum (Cyclic-Redundant Checksum). Building Management Systems (BMS) and Industrial Automation Systems (IAS) both use Modbus RTU (IAS). Because of its simplicity and reliability, it is a widely used serial-level protocol. Schneider Electric, formerly known as Modicon, developed Modbus RTU, an open serial protocol based on the master-slave architecture. However, the two most commonly used protocols are the Modbus Remote Terminal Unit (RTU), the serial (RS232 or RS485) protocol, and the Modbus Transmission Control Protocol (TCP/IP) and the Internet Protocol. The Modbus protocol has many protocol options. Modbus is a master-slave/client-server messaging framework developed by Modicon.
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