This Bash script is a Modbus device scanner for a serial RTU (RS-485) bus using mbpoll. It attempts to detect a Modbus-compatible device (like an Orno power meter) by cycling through common communication settings.

🔍 What it does, step-by-step: Loops over baud rates: 9600, 4800, 2400, 1200

Loops over parity settings: none, even, odd

For each combination of baud rate and parity, it:

Tries Modbus slave addresses 1 through 10

Uses mbpoll to read holding register 305 (typically voltage or similar)

If a response is received (detected via [305] in output), it:

✅ Prints success and breaks the loop, skipping to the next combination

If no response:

❌ Prints failure and waits 0.25s before trying the next address