Moxa NPort 6000-G2: World’s First Serial Server to Hit IEC 62443-4-2 Security Milestone

Closing the "Overlooked" Security Gap at the Industrial Connectivity Edge

TAIPEI, TAIWAN — March 2026 — Moxa Inc., a global leader in industrial communications, has reached a historic milestone in OT (Operational Technology) security. The NPort 6000-G2 Series has officially become the world’s first serial device server to attain the IECEE 62443-4-2 Security Level 2 (SL2) certification.

As IT and OT networks continue to converge, legacy serial devices—such as PLCs, meters, and consoles—often remain the most vulnerable points in an industrial plant. While these devices rely on stable protocols (RS-232/422/485), they were never designed to withstand modern cyberthreats. The NPort 6000-G2 Series acts as a certified "security gatekeeper," allowing asset owners to protect their trusted legacy infrastructure without needing a full-scale hardware overhaul.

Completing the "Edge-to-Core" Defense-in-Depth

This certification marks the completion of Moxa’s comprehensive security ecosystem. Industrial operators can now implement a certified defense strategy across every layer of their network:

• The Device Edge: Secured by the NPort 6000-G2 (Serial-to-Ethernet).

• The Network Core: Managed by EDS-G4000 switches and EDR-G9010 secure routers.

• Industrial Computing: Anchored by the UC-8200 Series computers.

The achievement was officially validated by Bureau Veritas (BV), confirming that the NPort 6000-G2 meets the rigorous technical security requirements for Industrial Automation and Control Systems (IACS).

"Protecting only the core infrastructure is insufficient if edge devices remain exposed. For industrial buyers, selecting secure-by-design products is no longer merely a compliance option—it is a fundamental requirement for diligent operational security." — David Hsueh, Cyber Director of Technology Products Taiwan at Bureau Veritas.

NPort 6000-G2 Series: Security and Reliability Highlights

The NPort 6000-G2 isn't just a bridge; it’s a hardened security component designed for the harshest industrial environments.

• Built-in Serial Cybersecurity: Features a secure-by-design architecture addressing incident visibility, data stream protection, and role-based authentication.

• IT-Friendly Integration: Seamlessly aligns with corporate security policies (NoC/SoC) by supporting centralized authentication and remote syslog monitoring.

• Web-Based Troubleshooting: Includes a Serial Traffic Monitor, allowing users to inspect traffic by port directly through a web interface, eliminating the need for extra diagnostic tools.

• Hardened Reliability: Offers broad OS support and versatile operation modes, engineered to maintain uptime in extreme temperatures and high-EMI zones.

Product Information & Resources

• NPort 6100-G2/6200-G2 Series (1/2-port Secure Terminal Servers): View Product Page

• NPort 6400-G2 Series (4-port Secure Terminal Servers): View Product Page

• NPort 6600-G2 Series (8/16/32-port Secure Terminal Servers): View Product Page

FAQ.

What is the significance of the IECEE 62443-4-2 certification?

It is the gold standard for industrial cybersecurity. Specifically, the 4-2 standard defines the technical security requirements for individual components. Achieving Security Level 2 means the device can protect against intentional but simple cyberattacks by people with generic skills and low resources.

Why do I need a secure serial server if my PLC is behind a firewall?

Modern threats often bypass perimeter firewalls via "lateral movement" or compromised maintenance laptops. By securing the serial server at the edge, you ensure that even if the internal network is breached, your most critical field assets remain protected.

Does this support legacy RS-232 and RS-485 devices?

Yes. The NPort 6000-G2 is designed specifically to bring modern security to legacy hardware, providing a secure Ethernet interface for RS-232, RS-422, and RS-485 connections.