Hi,
Your issue arises because the Arduino Uno's primary hardware serial port (Serial) is being used for both the USB communication with your computer and for MODBUS RS485 communication in your project. This creates a conflict, especially when you're trying to use the same serial port for monitoring and tuning your Simulink model via the USB connection.
Simulink models for Arduino typically use the hardware serial port for deploying and debugging the model, which is why you're encountering the error. To work around this, you're correct in thinking about "SoftwareSerial", a library that allows you to create a software-based serial port on almost any digital pins of the Arduino.
Unfortunately, Simulink does not directly support "SoftwareSerial" within its block set for Arduino. However, you can integrate custom code, including "SoftwareSerial", into your Simulink model. This involves writing some parts of your model's logic in C++ and ensuring it interacts correctly with the rest of your Simulink model.
Here is how to create to create a custom device driver for Arduino Library: https://www.mathworks.com/help/simulink/supportpkg/arduino_ug/create-custom-blocks-for-arduino-support-package.html
The above link contains information about:
- Create Project and Libraries Folder
- Write Hardware Specific C/C++ Code
- Select System Object Template
- Specify Initialization, Output, and Termination Behavior
- Update Paths for Source and Header Files
- Set Output Port Properties Create
- MATLAB System Block
- Generate Code and Deploy Model to Hardware
Hope it helps.
