Sealevel Systems, Inc.

In 1984, Tom O’Hanlan designed the first RS-422/485 communication adapter for the IBM PC. From that moment of inspiration, Tom and his wife Susan saw an ever-growing industry-wide need–and began work to fulfill it. In 1986, they formed Sealevel Systems committed to providing communication adapters for the IBM PC and compatibles. Today, they manufacture more than 300 standard I/O products with ISO 9001: 2000 registration and a standard lifetime warranty.

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