Modbus TCP Communication with W5100 Ethernet Shields

Projects General Guidance
1

Hey there,

iwant to setup a Modbus TCP Communication between 2 Arduino Nano with 2 W5100 Mini Ethernet shields.

Is there any example code for a master and slave availible?
the ArduinoModbus libary offers examples for wifi only ..

Thanks!

2

The ArduinoModbus library isn't designed to be used on AVR Arduinos (as the Nano is) as it is quite wasteful with memory and (de-)allocation, so you end up out-of-memory faster than you like.

3

thank you!

i just want to test it on the arduino:)
once its working i will move on to a STM32L4

but i cant find any code for a master and a slave.
This Lib : GitHub - andresarmento/modbus-arduino: A library that allows your Arduino to communicate via Modbus protocol, acting as a slave (master in development). Supports serial (RS-232, RS-485) and IP via Ethernet (Modbus IP).

gives Code for a Slave, but how can i test it?

4

i just want to test it on the arduino:)

Why don't you use the STM32L4 directly? There you shouldn't get memory problems.

gives Code for a Slave, but how can i test it?

Using Modbus on the PC (libmodbus)?