350+ Critical Communications Solutions in One Box

A Sealevel Blackbox can be an industrial computer, IoT edge device, PCIe or PCI card, Ethernet serial server, USB serial adapter – or any one of our 350+ critical communications solutions.

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By Land and Sea: Ground Control for the US Navy

The U.S. Navy’s arsenal includes a jet-powered, long-range cruise missile: an aerospace prime contractor contacted Sealevel for serial communications connectivity solutions.

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Lifetime Warranty.
Longterm Availability.

We offer over 350 core products, available in nearly every configuration imaginable.

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Monitor, control and improve real-world processes.

Sealevel announces the release of SeaCloud 2.0, the latest version of our secure, robust, Industrial Internet of Things software platform. 

Join the IoT Revolution

Thrives in rugged environments. Lives to test limits.

Yes, this is a tardigrade. And it’s also every product Sealevel designs and manufactures. Resilient. Reliable. Up for the challenge.

Rugged Computing & Serial

Big Picture Thinking

Whether your assets work in the most extreme environments or stay at a desk, we’ve got you covered. Sealevel engineers design computing solutions that excel across industries.


We've exceeded the expectations of
every major US and Allied nations military contractor.
We'll do the same for you.


What’s your flavor?
Oil, gas, electrical, solar, wind?
We’ve got the scoop on energy.

IIoT Integrators

Predictive maintenance.
Efficient operations.
New revenue streams.

Industrial Automation

We didn't invent
industrial automation.
But we might as well have.


How many senses would a sensor sense
if a sensor was powered by Sealevel?
All of them.

Public Safety

Connectivity solutions
where they matter most.
Is fast fast enough?

Smart Cities

Lights. Cars. Cities.
They're all getting smarter.
Shouldn't you?


Ready to go further with your
transportation solutions?
We are.


Pumps. Pipes. Tanks.
Anywhere else you have water,
we can help you control it.

Creative Doers, Serious Business.

Welcome to Sealevel Systems, Inc.

Since 1986, we’ve brought control to the user with our innovative I/O solutions that enable computer connectivity. As our product families expand, responsive thinking and creative development continue to drive our company. From engineering design to production and support, Sealevel ensures client satisfaction with precision-made technology and high-quality services.

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Featured Products

See Product Details
PCI 2-Port RS-232 Serial Interface
USB to RS-232 DB9 Serial Adapter Cable
Ethernet Modbus TCP to 16 A/D, 2 D/A, 8 Open-Collector Outputs, 8 Isolated Inputs Multifunction Module
Ethernet to 4 Isolated Inputs Digital Interface Adapter, with PoE (802.3af)

Latest News & Insights

March 4, 2021 — Industry Trends

IT/OT Convergence: Benefits & Adoption

Traditionally, Information Technology (IT) and Operational Technology (OT) have been separate operations with unique personnel teams and goals. However, with the increasing integration of the…

March 2, 2021 — Industry Trends

Looking to the Future of Wi-Fi: Wi-Fi 7

Wi-Fi 6 was released in 2020, and Wi-Fi 7 (802.11be) is just around the corner with expected release in 2024. Wi-Fi 6 implements a number…