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USB to RS232/RS485 Converter (6KV lightning protection)

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Type : USB to RS485/RS232 Converter
Description :

The device is designed to provide USB to RS232/RS485 conversion with 6KV lightning protection (RS232 or RS485, not simultaneously).


The device is designed to provide USB to RS232/RS485 conversion with 6KV lightning protection (RS232 or RS485, not simultaneously). This product is powered by a USB port and does not require an external power supply. It utilizes a unique and instantaneous automatic transmission and reception conversion technology, making it plug-and-play compatible with all software applications. It also features transmit/receive enable control, where the output remains in a high-impedance state during standby mode without data transmission, and supports multi-point communication.


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

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

RS232 and RS485 interfaces with 6KV three-level lightning protection (10/700us current waveform, internal resistance of 40Ω)

Gold USB interface with built-in TVS protection (±15kV air discharge and ±8kV contact discharge)

Unique design with three LED indicators: Power (red), Serial Receive (orange), and Serial Transmit (green)


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

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

It ensures complete compatibility with serial port applications on Windows operating systems without any modifications required.

The hardware includes integrated transmit and receive buffers, enabling RS485 communication at baud rates ranging from 50bps to 2Mbps, and RS232 communication at baud rates ranging from 50bps to 256kbps.

The device automatically selects between RS232 and RS485 interfaces upon connection without the need for manual configuration (Note: RS232 and RS485 interfaces cannot be used simultaneously).

It supports various operating systems, including Win98/2K/XP, WIN10/WIN11 (32/64-bit), Linux, MAC OS-9/X, and Android.

RS485 communication requires the use of shielded twisted pair cables with a minimum cross-sectional area of 0.5mm copper. The maximum communication distance depends on the baud rate selected, with distances of up to 3000 meters (4800bps), 2000 meters (9600bps), or 1000 meters (115.2Kbps) achievable.

The minimum number of network nodes supported in an RS485 network is 128, while the maximum number is determined by the RS485 input impedance of each station.

It features three LED indicators: Power (red), Serial Data Receive (orange), and Serial Data Transmit (green), providing convenient status monitoring.

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

The RS232/485 interfaces are equipped with three-level lightning protection, meeting the GB/T17626.5 (IEC61000-4-5) standard. The device can withstand a short-circuit current waveform of 10/700μs and an open-circuit peak output voltage of 6KV, with an internal resistance of 40Ω.

Operating temperature range of -40℃ to +85℃.

It has passed 100% burn-in testing.


● Serial Interface


EIA/TIA-232 RS-232 (ITU-T V.28)

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

Serial interface


RS-485: A+, B-, GND

Physical interface: 5-core 3.81mm pitch screw terminal


● USB2.0 Interface


Standard: USB2.0

Full speed: 500Kbps~12Mbps

Physical interface: gold-plated USB TYPE A male


● 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

Lightning protection USB to 1 channel RS232/485 converter

Port Description

1 channel USB2.0 interface; 1 channel RS232 interface, 1 channel RS485 interface

Power Supply

Passive, USB powered, power consumption <150mW (5V 30mA)

Product Size

Dimensions: 70mm(L) x 26mm(W) x 14mm(H)




APPlication of usb to 232/485


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