Modbus is a widely used industrial communication protocol. RTU normally uses serial RS485, while TCP uses Ethernet.
Modbus RTU and Modbus TCP is relevant when selecting, integrating, replacing or troubleshooting industrial automation equipment. The exact engineering requirement depends on the controller, machine process, interfaces, safety requirements and maintenance strategy.
This definition is intended as a technical reference. Product compatibility, safety performance and final selection must be confirmed against the latest manufacturer documentation and the actual machine conditions.
