contents) are shown in the following figure. "response message" with their fields (i.e. The enlarged view of the "Query message" and The Modbus protocol is based on query/response model. There are many protocols for industrial automation and metering. Modbus/TCP defined for IP based link layer for Modbus frames. Modbus protocol runs on top of RS232, RS422 and RS485. This Modbus protocol is used in SCADA style of network communication It is a application layer protocol which is based on client/server architectureīetween the devices connected on different types of buses or networks. "Modbus" term is a trademark of Modicon Inc. The Modbus protocol tutorial also describes application examples. This Modbus tutorial covers modbus protocol basics,ASCII and RTU frame structures, Modbus tutorial | Modbus protocol, ASCII & RTU Frames, Modbus Working
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