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Industrial USB to RS485 Converter Cable (3KV isolation/6KV lightning protection)

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Type : USB to RS485 Converter
Description :

The basic function of this device is USB to RS485 with 3KV isolation and 6KV lightning protection.


The basic function of this device is USB to RS485 with 3KV isolation and 6KV lightning protection. The USB port powers the device and does not require an external power supply. It uses a unique zero-delay automatic transmit/receive conversion technology, plug-and-play compatible with all software, and has transmit/receive enable control. The output is in a high-impedance state in standby mode without sending data. It supports multi-point communication.


Features of this device include:

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

RS485 interface with 3KV isolation (can withstand AC-380V without damaging the USB port) and 6KV 3-level lightning protection (10/700us current wave, internal resistance 40Ω).

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

1-channel isolated 5V power output (2W).

Three LED lights: power (red), RS485 receive (orange), RS485 transmit (green).


The device features a full-speed USB port, making it compatible with USB v2.0.

It comes with an industrial-grade structured USB cable, which includes a high braiding density, braided shield, and magnetic ring shield. The cable is equipped with a metal wire for added tensile strength. It is available in three length options: 0.5m, 1.5m, and 3m.

The device emulates a standard serial port, allowing for the upgrade of existing peripheral devices or the addition of extra serial ports through USB.

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

The hardware includes a built-in transmit/receive buffer and a high-speed isolation chip operating at 10Mbps. It supports communication baud rates ranging from 50bps to 2Mbps.

The device is compatible with various operating systems, including Win98/2K/XP, WIN10/WIN11 32/64-bit systems, Linux, MAC OS-9/X, and Android.

The communication cable is constructed using shielded twisted pair copper wire with a minimum cross-sectional area of 0.5mm. It allows for a maximum communication distance of 3000 meters (4800bps), 2000 meters (9600bps), or 1000 meters (115.2Kbps).

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

The device features three LED indicators: a red light for power, an orange light for serial data receive, and a green light for serial data transmission. These indicators facilitate status monitoring.

The USB port is gold-plated and the device is powered via USB. It operates with a working current of less than 30mA. The USB interface offers protection against electrostatic discharge (ESD) up to ±15kV (air) and ±8kV (contact). Additionally, it provides EFT protection up to 40A (5/50ns) and lightning protection up to 5A (8/20us).

The RS485 interface is equipped with 3KV isolation, ensuring that only the RS485 interface is affected when connected to high voltages such as AC220V or AC380V for an extended period. The USB port and connected devices remain unaffected.

The RS485 interface features 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.

The interface includes a 3KV isolated 5V power terminal output, capable of delivering a maximum power of 2W.

The device is designed for wide temperature range applications, with an operating temperature ranging from -40°C to +85°C.

It has undergone 100% burn-in testing to ensure quality and reliability.


● Serial Interface


EIA/TIA-485 RS-485 (ISO/IEC8284)

Serial Port Interface:

RS-485: A+, B-, GND

Physical Interface: 5-core 3.81mm pitch screw terminal


● USB 2.0 Port

Standard: USB 2.0

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

Physical Interface: USB Type A male connector

USB Cable Length: 0.5m/1.5m/3.0m


● 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






CH340 solution, cable length 0.5m


FTDI solution, cable length 0.5m


CH340 solution, cable length 1.5m


FTDI solution, cable length 1.5m


CH340 solution, cable length 3.0m


FTDI solution, cable length 3.0m

Function Description

Lightning Protection and isolated USB to 1-channel RS485 converter with USB cable

Ports Description

1 * USB 2.0 port; 1 * RS485 port

Power Supply

Passive, USB-powered
Power Consumption: <150mW (5V, 30mA)

Product Dimensions

75mm (length) x 47mm (width) x 20.5mm (height)




application of usb rs485 converter


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