![]() In this article, we'll talk about Modbus RTU transmission mode. ![]() In TCP/IP networks, however, the higher-level protocol is TCP transport protocol and this variant is called Modbus TCP. The standard 'environment' for Modbus protocol is RS485/422/232. The typical structure of an automation system that uses Modbus as its basic protocol is shown below. The field level is the level of interaction between sensors and controllers or sensors and the server. The middle level is the level of controllers - devices that collect data and control the technological process. Modbus is a common protocol used in automation systems at the middle and lower (field) levels.
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