Modicon modbus rtu7/29/2023 QQ QQ Refers to the amount of records to be read from the initial memory address MM MM This 2-byte set represents the initial memory address (N4/B4 parameter) SS Corresponds to Slave ID byte, that is, the device’s address on the network (N1/B1 parameter)Ġ3 “03” byte indicates Modbus’ write “03 Function” In case of (TX) commands for reading via Modbus protocol’s “03” Function, the byte structure is the following: These bytes can be visualized via log file.Īll bytes from Modbus RTU/TCP protocol are in hexadecimal format, except if the driver has been set up to communicate with Modbus ASCII protocol. The goal of this article is to provide details to the bytes that are part of the structure of Modbus protocol’s “03” Function.
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