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Industrial USB to 4-Port RS485 Converter (3KV isolation/6KV lightning protection)

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Type : USB to RS485 Converter
Description :

The basic function of this device is USB to 4-channel 3KV isolation/6KV lightning protection RS485.


The basic function of this device is USB to 4-channel 3KV isolation/6KV lightning protection RS485. The device is powered by a USB port, eliminating the need for an external power source. It incorporates a unique zero-delay automatic transmit-receive conversion technology, making it plug-and-play compatible with all software. It features transmit-receive enable control and enters a high-impedance state when in idle mode without data transmission. It supports multi-point communication.


Distinguishing itself from other similar low-cost products available in the market, this product offers the following:

Industrial-grade operating temperature range (-40℃ to +85℃).

3KV isolation (Connect to AC~380V without burning USB port)/ 6KV lightning strikes protection  (10/700us current wave, internal resistance of 40Ω) for the serial port.

RS485 highest speed support up to 2Mbits.

USB built-in TVS protection (±15kV-air and ±8kV-contact).


The device features a full-speed USB device interface that is compatible with USB v2.0.

It simulates a standard serial port, allowing for the upgrade of existing peripheral devices or the addition of additional serial ports via USB.

The device is fully compatible with serial port applications on Windows operating systems, requiring no modifications.

Its hardware includes fully integrated transmit-receive buffers. Each serial port is equipped with a 10Mbps high-speed isolation chip, supporting communication baud rates ranging from 1200bps to 2Mbps.

The 4-port RS485 serial ports and USB interface have 3KV isolation. When exposed to long-term high voltage of AC220V or AC380V, the RS485 interface alone is affected, while the USB port and connected devices remain unaffected.

It is compatible with operating systems such as Win98/2K/XP and WIN10/WIN11 32/64-bit systems.

For communication, the device utilizes shielded twisted pairs with a minimum cross-sectional area of 0.5mm copper wire. It can achieve a maximum communication distance of 3000 meters (4800bps), 2000 meters (9600bps), and 1000 meters (115.2Kbps).

The minimum number of networked sites supported is 128, while the maximum number of networked sites depends on the RS485 input impedance of each site.

The device has 5 LED indicators, including a power indicator and dual-color indicators for data transmission and reception on the 4 serial ports, allowing for easy status monitoring.

It features a Type B USB port and operates on USB power, with a working current of less than 30mA. The USB interface is protected against electrostatic discharge, capable of ±15kV (air) and ±8kV (contact), and it also provides EFT protection of up to 40A (5/50ns) and lightning protection of up to 5A (8/20us).

The RS485 interface is equipped with three-level lightning protection, meeting the GB/T17626.5 (IEC61000-4-5) standard. It can withstand a short-circuit current wave of 10/700μs and an open-circuit peak output voltage of 6KV, with an internal resistance of 40Ω.

Working from -40°C to +85°C.

It has passed the 100% burn-in test.


● Serial Interface


  EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial Port Interface:

  RS-485: A+, B-, GND

Physical Interface: 2*8 3.5mm pitch screwless terminals


● USB 2.0 Interface

Standard: USB 2.0

Full-speed: Full-speed (500Kbps – 12Mbps)

Physical Interface: USB Type B female connector


● Environmental Index

Operating Temperature: -40°C to +85°C

Storage Temperature: -40°C to +85°C

Operating Humidity: 0% to 95% (non-condensing)

MTBF: > 100,000 hours


Product Model


Function Description USB to 4-port RS485 Converter with Lightning Protection and Isolation
Ports Description 1 USB 2.0 port; 4 RS485 ports
Power Supply Passive, USB powered, power consumption < 1W

97mm (length) x 54mm (width) x 32mm (height)

35mm DIN rail mounting, wall-mounting

Weight 0.076 Kg/pcs


application of usb to 485


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