I recently embarked on a project to integrate my old ventilation system with an RS485 interface into my smart home ecosystem. It was a bit daunting at first, but I’m thrilled to share my success story! 
The Challenge:
My ventilation system uses a non-Modbus RS485 protocol, and I wanted to control it via an ESP device. I connected it using an USB-RS485 adapter and experimented with different baud rates (2400, 4800, 9600). The data was consistent at 4800 baud, but sending commands didn’t work as expected. I suspected timing issues or incorrect settings.
The Solution:
After some research, I realized the protocol might require specific timing between commands. I adjusted the delay between sending commands and voilà! The system responded perfectly. Now, I can monitor and control the ventilation system through my ESP setup. 
A Side Project:
While working on this, I also got my hands on the Govee Nebula projector, which has been a game-changer for my evenings. The starry night effect is mesmerizing, and the warm lighting makes it perfect for relaxing. I even integrated it with my smart home to turn it on with a voice command. The only minor downside? The green stars are a bit noticeable, but overall, it’s a fantastic addition!
Tips for Others:
- Experiment with Baud Rates: Start with lower rates and gradually increase while monitoring data consistency.
- Check Timing: Some protocols require precise delays between commands.
- Log Data: Keep detailed logs of your findings to identify patterns or issues.
If anyone has questions or needs advice on RS485 integration or smart home projects, feel free to reach out! I’d love to help others on their journey. 