DevOps

Getting Started with Modbus RTU on ESP32

Modbus RTU over RS-485 is the serial workhorse of industrial field wiring — the variant you'll meet when connecting an ESP32 directly to an energy m…

I bought the most expensive cable I could—and it still died. Welcome to RS485 vs 1000V DC.

A Class A solar pyranometer, the original shielded cable, 10 meters. Dies every 1-2 hours. In the end, I switched to 4-20mA. A few years ago at a so…