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Isolated RS485 Repeater (Extender)

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Type : Isolated RS485 Repeater
Description :

The RS485 isolated repeater has 2 fully electrically isolated RS485 channels, each with an independent RS485 transceiver.


The RS485 opto-isolated repeater has 2 fully galvanically isolated RS485 channels, each with an independent RS485 transceiver. The device can automatically sense the data flow direction and communication baud rate without any control or handshake signal, ensuring transparent data transmission. It complies with the RS485 standard and supports transparent, protocol-independent RS485 message transmission, making it suitable for various applications such as Modbus protocol.


Each channel of the RS485 isolated repeater has a 6kV lightning protection capability, opto-isolation, and an isolation voltage of up to 2.5KV, with each channel having an independent ground wire. This ensures that when one RS485 bus is destroyed, the devices on other RS485 buses are protected. Each RS485 and power port can carry a maximum of 128 devices, and the power port also has a 6kV lightning protection capability.


The device is designed for industrial use and features fully isolated communication, ensuring stable and reliable performance. It supports transmission rates of up to 300Kbps.

Each RS485 channel has 6kV lightning protection, 2.5KV opto-isolation, independent shielding and ground interfaces, and LED indicators.

The data flow is controlled automatically, with the product able to identify and control the direction of data transmission.

It supports multi-device communication, with each RS485 channel supporting up to 128 enhanced nodes. The maximum transmission distance is 1500 meters.

A DC-DC power supply with an isolation voltage of 2500V powers it. The communication signal is isolated via a high-speed optocoupler, ensuring galvanic isolation between ports.

It supports various power inputs, including AC and DC power supplies from 9V to 70V. The power interface has a 6kV lightning protection capability.

The power supply features overload protection and reverse polarity protection, and meets industrial-level electromagnetic compatibility requirements.

The product offers strong lightning protection capabilities, with resistance to lightning strikes, high voltage induction, and surge protection.

It features fanless, efficient cooling, reducing repair time.

DIN-Rail mounting or wall-mounted.

Working temperature -40℃~ +85℃.

It has passed 100% burn-in testing.


● Serial Interface


EIA/TIA-485 RS485 (ISO/IEC 8284)

Serial interface: RS-485 2 wires: A (corresponding to TX+) B (corresponding to TX-) GND

Physical interface: 5.08mm spacing screw terminal


Working Environment

Working temperature: -40°C – +85°C

Storage temperature: -40°C – +85°C

Working humidity: 0% – 95% (no condensation)

MTBF: >100,000 hours


Product Model


Function Description

Industrial rail type 1-channel RS485 opto-isolated repeater

Port Description

2*isolated RS485 channels; 1*power interface

Power Supply

Power input: DC9-70V;  Power consumption: <1W

Overload protection: support;  Reverse connection protection: support;

Access terminal: 2-core 5.08mm pitch screw terminal

Product Size

Dimensions: 97mm(L) x 54mm(W) x 32mm(H)

Mounting method: 35mm rail, wall-mounted












application of rs485 repeater


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