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Fend SE5
Data Diode

Fend’s patented hardware is designed for the unique needs of industrial control systems. The Fend SE5 Data Diode is designed and built in the USA. Bring legacy industrial equipment online with the total security of full optical isolation.


No License Fees or Hidden Costs

U.S. and Canada-based customers:

Located outside the U.S. and Canada or need to make a volume purchase?


The Fend SE5 Data Diode includes the following protocols:


  • SFTP

  • TCP

  • UDP

  • Modbus Serial, Modbus TCP/IP

  • BACnet MSTP, BACnet IP 

  • LON-IP

  • Fend Cloud on AWS (with optional subscription)


Integrations available for additional protocols and systems including OPC UA, Wonderware, and others. Learn more about our integration services.

Listen to industrial control system network traffic and send relevant data to on- or off-premise servers for storage or analysis. Help
prioritize maintenance tasks and equipment upgrades. 


Visualize time-series data / custom displays on Fend’s portal or other cloud platform.


Setting up a diode is as easy as logging in the Fend Configuration Tool, selecting your protocols, entering some basic information. It takes minutes!


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PDF Drawing

DWG Drawing

What's in the Box?


Every diode comes with:

  • Two 120VAC to 12VDC power supplies

  • An Ethernet cable for setup

Diode Setup and Configuration

Fend diodes come with a browser-based graphical user interface for easy configuration. Simply log into the diode using your web browser and do the following:

  • Select your input side interface and protocol

  • Select your output side interface and protocol

  • Update the network and protocol settings for your use case

  • Click “Save & Exit” to apply your changes

Supports popular browsers across Windows, Linux, and Mac.

Ready to start with your new diode? Click here for a quick start guide.

Additional Features

Provides continued insight during power outages or in environments with unstable electric power.

Power Loss Protection

On-board protection resists and recovers from Denial of Service (DOS) attacks 

DDoS Protection

Built-in anti-tamper protects against physical interference.

Tamper Resistance
Data Diode-industrial-optical-iso-simpli

Physically enforced one-way data flow prevents any malicious code from reaching the protected equipment or network. Fend’s diodes use full optical isolation that allows data out and nothing in.

Full Optical Isolation

Easily set up and configure your diode with Fend's Diode Configuration Tool

Field Configurable

Fend isolates the protected system and offers encrypted protocol options for data in transit.

Onboard Encryption

Rugged design allows Fend diodes to live alongside the equipment they protect. Flush mount and DIN rail options. ETL tested / FCC Certified.

Designed for Industry

Full electrical isolation between input and output sides of the diode prevents side-channel attacks over power lines.

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Separate Power Supplies

SE5 Data Diode Frequently Asked Questions 

What’s the installation process for SE5 data diode?

Installing the SE5 data diode takes only a few minutes and requires your computer, ethernet cable, and the data diode. Review our Quick Start Guide for step-by-step instructions to walk you through the installation process.

What type of business is this SE5 data diode designed for?

The SE5 data diode is used across many different industries in order to protect its cybersecurity, including energy and utilities; oil and gas; water and wastewater infrastructure, and more. Be sure to review our industries page for more information on data diode usage across different industries.

Request a Quote

Ready to buy? Request a quote today!

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