This document is an introduction to the operation manual of the RTU-485 Modbus remote I/O communication module. The module is an open-type enclosure and needs to be installed in a wiring box with dust-proof, moisture-proof, and electric shock/impact protection. The module has the functions of automatic detection of I/O modules and connection of special input/output modules.
The RTU-485 is an open‑type Modbus communication module designed for integration with PLC systems. It supports RS‑485 communication, 24 VDC power input, and up to 128 digital inputs and 128 digital outputs, plus up to eight special I/O modules.
The manual covers safety precautions, mechanical dimensions, installation on DIN rails, DIP switch configuration for communication mode, wiring diagrams, LED status indicators, and detailed fault diagnosis procedures. This manual is written in Chinese.
| Communication Interface | RS‑485 |
|---|---|
| Power Supply | 24 VDC (‑15% ~ +20%) |
| Maximum Input Voltage | 500 VDC |
| Supported Baud Rates | 1,200 bps – 115,200 bps |
| Digital I/O Points | 128 inputs, 128 outputs |
| Special I/O Modules Supported | Up to 8 modules |
The module supports baud rates from 1,200 bps up to 115,200 bps.
It provides 128 digital inputs and 128 digital outputs.