Dealing with raw RS485 serial timings directly in Python (especially on a non-real-time OS like Linux or a Raspberry Pi) is a recipe for dropped frames, bus collisions, and CRC errors.

Instead of writing complex software locks and fighting the `serial` library, I completely decoupled the architecture for this data logger. I let a dedicated hardware gateway handle the strict physical layer polling (acting as a transparent bridge), and my Python script simply reads the cleanly parsed data over Modbus TCP via Ethernet.

### 1. System Architecture

Here is the minimalist topology I used. No messy USB-to-RS485 dongles involved:

```text
+-----------------------+ +------------------------+ +-----------------------+
| Data Logger Host | | Hardware Bridge | | Industrial Sensors |
| (Raspberry Pi/PC) | | (RS485 to Ethernet) | | (Modbus RTU) |
+-----------+-----------+