This wide acknowledgment is expected in big part to MODBUS RTU’s convenience. Modbus RTU is used for Building Management Systems (BMS) and Industrial Automation Systems (IAS). ![]() It is a very well accepted protocol because of its usability and quality. Modbus RTU is an open, serial (RS-232 or RS-485) protocol derived from the Master/Slave architecture. The Slave echoes to the request of the initial function code in the case of a normal response. When the Master receives the Slave response, the function code field is used by the Slave to indicate either an error-free response or an exception response. It could also read/write the data contents of a group of MODBUS registers. For instance, the Master is able to read the ON/OFF states of a group of discreet outputs or inputs. To define multiple actions, some functions will have sub-function codes added to them.
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