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Industrial Grade 6KV Lightning Protection USB to 1 Channel TTL Converter (with cable) FC-2109

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The basic function of this model FC-2109 is to convert USB to 1-channel 6KV lightning protection TTL. The working power of this product is supplied by the USB port, no external power supply is required, and it adopts a unique no-delay automatic transceiver conversion technology. It is plug-and-play and suitable for all software. It also has transceiver enable control, and the output is in a high-impedance state when not sending data, supporting multi-point communication.

Different from other similar cheap products on the market, this product:

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

Serial port 6KV three-level lightning protection (10/700us current wave, internal resistance 40Ω)

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

Unique 3LED lights, power supply:red light, serial port receiving: orange light, serial port sending: green light.


Full-speed USB device interface, compatible with USB v2.0.

USB cable with industrial-grade structure, high braiding rate braided mesh shielding and magnetic ring shielding, with metal wire tensile rope, three cable lengths available: 0.5m, 1.5m, 3m.

Simulates standard serial ports, used to upgrade original serial port peripherals, or add additional serial ports through USB.

The serial port application under the Windows operating system on the computer side is fully compatible and requires no modification.

The hardware has fully built-in transceiver buffer, supporting communication baud rate 50bps~2Mbps

Applicable to operating systems: Win98/2K/XP, WIN10/WIN11 system 32/64 bit, Linux, MAC OS-9/X, Android.

3 LED indicators: power: red light, serial port data receiving: orange light, serial port data sending: green light, convenient for monitoring status.

Power supply USB powered, working current <30mA, USB interface protection: electrostatic protection up to ±15kV (air) and ±8kV (contact), EFT protection up to 40A (5/50ns), lightning protection up to 5A (8/ 20us)

The TTL interface has three levels of lightning protection, and the lightning protection reaches the GB/T17626.5 (IEC61000-4-5) short-circuit current wave 10/700μs open circuit peak output voltage 6KV, internal resistance 40Ω standard;

The interface has a 5V power terminal output (0.5A PTC protection tube), which is protected when working above 0.7A.

Wide temperature type: working temperature -40℃~ +85℃;

All models pass 100% baking machine test;

USB directly connects to computer lightning strike test: TTL interface can pass: lightning strike test with short circuit current wave 10/700μs, open circuit peak output voltage 6KV, internal resistance 40Ω

Wide temperature type: operating temperature -40℃~ +85℃, +85℃ high temperature test: in an aging box of 85℃, the converter can work normally without packet loss or crash.


● TTL Interface   

Pin definition: TXD, RXD, GND

Level:   In: 0-5V (low<0.8V, High>2.0V)

Out: 0-5V

Rate: 50bps~2Mbps

● USB2.0 Interface

Standard:    USB2.0

Full speed:   Full-speed (25Mbps~480Mbps)

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 Number



FC-2109-A, cable length 0.5m

FC-2109-B, cable length 1.5m

FC-2109-C, cable length 3.0m

Product Function Description

Lightning protection USB to 1 channel TTL converter, With USB cable

Service Port Description

1 USB2.0 interface; 1 TTL interface

Power Supply

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

Product Size

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





Description of the 5-bit terminal


5V output, with 0.5A resettable fuse


power ground


TTL shield ground


TTL data negative pin


TTL data sending



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