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

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Type : USB to RS485 Converter
Description :

The FC-2001 model device has the following essential functions: USB to RS485 converter with 3KV isolation and 6KV lightning protection.


The FC-2001 model device has the following essential functions: USB to RS485 converter with 3KV isolation and 6KV lightning protection. The USB port powers the device and does not require an external power supply. It utilizes a proprietary zero-delay automatic send/receive conversion technology, making it plug-and-play compatible with all software. It also features send/receive enable control. The output is in a high-impedance state in standby mode without data transmission. The converter supports multi-point communication.


This USB to RS485 converter has the following features:

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

Serial port with 3KV isolation (able to withstand AC-380V without damaging the USB port) and 6KV level three lightning protection (10/700us current wave, internal resistance of 40Ω)

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

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

Unique with 3 LED indicators: Power (red), Serial Receive (orange), and Serial Transmit (green)


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

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

The serial port applications on Windows operating systems are fully compatible without the need for any modifications.

The hardware is equipped with integrated transmit and receive buffers and includes a high-speed isolation chip capable of supporting communication baud rates ranging from 50bps to 2Mbps.

It 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 lines are designed using shielded twisted pairs with a minimum cross-sectional area of 0.5mm copper, allowing for maximum communication distances of 3000 meters (4800bps), 2000 meters (9600bps), and 1000 meters (115.2Kbps).

The minimum number of network nodes is 128, and the RS485 input impedance of each node determines the maximum number of network nodes.

The device features 3 LED indicators: a red light for power, an orange light for serial data reception, and a green light for serial data transmission, enabling convenient status monitoring.

The USB port is gold, and the device is powered by the USB supply, with a working current of less than 30mA. The USB interface protects against electrostatic discharge (ESD) of up to ±15kV (air discharge) and ±8kV (contact discharge), as well as EFT protection of up to 40A (5/50ns) and lightning protection of up to 5A (8/20us).

The RS485 serial port features 3KV isolation, which means that when exposed to high voltages such as AC220V or AC380V for an extended period, only the RS485 interface is affected, while the USB port and connected devices remain unaffected.

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

The interface also includes a 3KV isolated 5V power output terminal with a maximum power of 2W.

Working temperature: -40℃~ +85℃.

The USB to rs485 converter has passed the 100% burn-in testing.


● Serial Interface

Standard: EIA/TIA-485 RS-485 (ISO/IEC 8284)

Serial Port Interface:

RS-485: A+, B-, GND

Physical Interface: 5-core, 3.81mm pitch screw terminal


● USB 2.0 Interface

Standard: USB 2.0

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

Physical Interface: Gold-plated USB Type A male 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 Lightning protection isolated USB to RS485 converter
Ports Description

1 * USB2.0; 1 * RS485

Power Supply Passive, USB powered, power consumption <150mW (5V 30mA)
Product Size

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




application of usb to 485


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