Sealevel Systems, Inc. reinvented the I/O and industrial computing industry with the first RS-422/485 communication adapter for the IBM PC. Since 1986, Sealevel has continued to redefine design, engineering and manufacturing for industrial computers, Ethernet serial servers, USB serial, PCI Express and PCI bus cards, and IoT hardware and software. Sealevel is committed to a first-in-industry lifetime warranty on I/O and long-term availability of all products, beyond the life of your mission.

Military applications often require custom adaptations of COTS products and, for over 30 years, Sealevel has exceeded our defense customers’ expectations. We have consistently provided innovative hardware and software products enabling computer connectivity and control to every major US and Allied military contractor including Northrop Grumman, Raytheon, BAE, Boeing, L3Harris, General Dynamics, NAVWAR, NAVAIR and SOCOM.