STM32 Modbus TCP: Complete Tutorial Series
Modbus TCP is one of the most widely used industrial communication protocols. It runs over Ethernet and uses the standard TCP/IP stack, which makes it easy to integrate STM32 microcontrollers into modern industrial networks. This series covers everything you need to implement Modbus TCP on the STM32 — from understanding the protocol basics to full hands-on implementation as both a server and a client.
We start with the protocol fundamentals, then move into practical implementation using the Mongoose networking library. On the server side, we will read discrete inputs, work with coils, and handle holding and input registers. On the client side, we will connect the STM32 to another server and request data from it. If you have already followed the Modbus RTU series, you will find a lot of familiar ground here — the function codes and data model are exactly the same. Only the frame structure changes.
MODBUS PROTOCOL 101
Modbus #1. STM32 Master Reads Holding and Input Registers
Modbus #2. STM32 Master Reads Coils and inputs
Modbus #3. STM32 Master Writes single Coil and Holding Register
Modbus #3.1 STM32 Master Writes Multiple Coils and Registers
Modbus #4. STM32 as Slave || Read Holding and Input Registers
Modbus #5. STM32 as Slave || Read Coils and Inputs
Modbus #6. STM32 as Slave || Write Registers
