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Press Releases

New SeaI/O High-Current Relay & Optically Isolated Input Module

Date: 11/14/2006

Sealevel Systems, Inc. announces the expansion of the SeaI/O family of data acquisition devices with the introduction of the SeaI/O-520 digital I/O module. Offering a powerful combination of high-current Form C outputs and optically isolated inputs, SeaI/O-520 modules are perfect for a wide variety of applications including process control, facility management, security, and broadcast automation.

The SeaI/O-520 provides eight SPDT high-current Form C relays that can directly switch 6A loads at 250VAC and 100VDC. Additionally, eight non-polarized inputs can monitor 5-30VDC and provide optical isolation to protect the host computer and other sensitive equipment from voltage transients and ground loops that are common in industrial environments.

Ordering options allow connection to a host computer via wireless Ethernet (802.11b/g), wired Ethernet, RS-485, USB, or RS-232. Status LEDs are included to indicate communication, power, and fault conditions. For connecting I/O, removable terminal blocks are standard, enabling fast, versatile field wiring. SeaI/O modules operate from 9-30VDC, and power can be input via terminal block or DC jack. Both table mount and DIN rail mounting options are available, and installation is made easy using Sealevel?s software configuration tools.

A variety of SeaI/O expansion modules are available offering Reed and Form C relays, optically isolated inputs, TTL interface to industry standard solid-state relay racks, A/D and D/A functionality. Multiple units of any I/O type can be easily daisy chained together using convenient pass-through connectors. This expansion capability enables a distributed network to be controlled with even a traditional point-to-point USB or RS-232 host connection. Multiple units can be combined in a local stack or separated up to 4000 feet using the RS-485 Modbus RTU expansion interface. For easy software integration, application programs or 3rd party software can use Sealevel?s SeaMAX library or industry standard Modbus protocol.

SeaI/O modules are housed in rugged metal enclosures suitable for extreme environments. Standard operating temperature range is 0?C to 70?C and extended temperature range (-40?C to +85?C) is optional. SeaI/O-520 prices start at $289 and product is available immediately from stock. All SeaI/O products include Sealevel?s lifetime warranty.

For more information on Sealevel Systems, please contact Earle Foster at Sealevel, by phone at
(864) 843-4343, or by email at This press release and high-resolution graphic can be downloaded from the Sealevel ftp site at


Sealevel Systems, founded in 1986, provides industrial computing solutions in addition to a variety of communications and I/O products including PCI Express and PCI Bus cards, Ethernet serial servers, and USB serial adapters. The product line includes multi-port RS-232, RS-422/485, RS-232/422/485 multi-interface high-speed sync/async, and digital/relay I/O. For more information visit or call 864-843-4343.


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