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Fend SE

Data Diode

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

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The Fend SE Data Diode supports the following protocols:


  • TCP/IP

  • Modbus Serial, Modbus TCP/IP

  • BACnet MSTP, BACnet IP 

  • LON-IP

  • Fend Cloud / AWS

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.



Additional Features

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

Backup Battery

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

DDoS Protection

Built-in anti-tamper protects against physical interference.

Tamper Resistance

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

Field Configurable

Fend isolates the protected system and encrypts the information in transit for end-to-end data protection.

Onboard Encryption

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

Designed for Industry

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

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

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