LM-203, LM-205, and LM-208 are excellent series of RS485 routers for Modbus or other protocol with multiple masters. They use the latest 32-bit Cortex-M3 high-speed ARM processor as the routing processing unit, providing high performance and flexibility.
The LM-203/LM-205/LM-208 series are RS485 Modbus routers built around a 32‑bit Cortex‑M3 ARM processor. They support up to 256 devices per port (512 for the LM‑208) and a maximum communication distance of 1200 m. The routers operate from a 7.5 V to 30 V supply, consume 10‑20 mA, and feature 15 kV ESD protection.
The manual describes wiring diagrams, LED indicator functions, and parameter configuration such as baud rate selection (1200‑115200 bps), routing mechanism, contention handling, and timeout settings. Physical dimensions are 106 mm × 98 mm × 22 mm, and the operating temperature range is –40 °C to 85 °C. This manual is written in Chinese.
| Operating Temperature | -40 °C to 85 °C |
|---|---|
| Power Supply Voltage | 7.5 V – 30 V |
| Current Consumption | 10‑20 mA |
| ESD Protection | 15 kV |
| Maximum Communication Distance | 1200 m |
| Supported Baud Rates | 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps |
| Dimensions | 106 mm × 98 mm × 22 mm |
The router can communicate up to 1200 meters.
The baud rate is set via the router’s parameters and can be selected from 1200 to 115200 bps.