Sealevel Systems

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Sealevel Systems, Inc.

Company type| Private
Industry| Hardware & software
Founded| 1986
Headquarters|

Liberty, South Carolina

United States

Key people

| Tom O’Hanlan, Founder, CEO
Products| Computing/HMI, serial boards, I/O boards

Net income

| Not Reported
Website| www.sealevel.com

Sealevel Systems, Inc. is a privately held manufacturer headquartered in Liberty, South Carolina,[1] which develops computer circuit I/O boards.

## Company overview

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Sealevel Systems was founded by Tom O’Hanlan and his wife Susan, in 1986.[2]

In 1991 the company released a dual port serial card that allowed users to set its I/O addresses to any two COM ports.[3] In 1994, Sealevel developed the RS-485 auto-enabled circuit. The circuit eliminated the need to control the RS-485 transceiver-enable signal via software and removed the risk of communications error due to bus communications.[2][4]

In 1997, O’Hanlan was granted a patent for a communication device that transmitted asynchronous formatted data synchronously.[5] The company produced the communications card used for positioning the Space Shuttle's robotic arm in 2002.[6] Tom O’Hanlan and technical author Jon Titus co-authored a book, The Digital I/O Handbook, in 2004.[7]

In 2005, Sealevel Systems released the industry's first RoHS-compliant serial I/O board.[8] In 2008, Sealevel won a defense contract for a USB/serial port cable with a heavily encased circuit board.[9] The cable allows soldiers in the field to link laptops to AN/PRC-117F Multiband Manpack Radio (MBMMR) tactical radios, manufactured by any company, and transmit data, including GPS maps, images, coordinates and IM-type communications via radio signal instead of by satellite. It took seven years for the company to perfect the technology.[10] In 2013 the company was awarded a sole-source contract for Naval Air Systems Command for this cable.[11]

## References

[edit]

1. ^ "Company Overview of Sealevel Systems, Inc". Bloomberg Businessweek. Archived from the original on July 12, 2009. Retrieved May 29, 2014.
2. ^ a b Control Engineering, Staff. "Data Risk for RS-485 Users?". Control Engineering. Retrieved May 1, 2008.
3. ^ Salami, Joe (April 16, 1991). Gain Control Over COM3 and 4 with COMM+232. PC Magazine. p. 41.`{{cite book}}`: CS1 maint: location missing publisher (link)
4. ^ "Spec Sheet". PC/104 Consortium. Retrieved May 29, 2014.
5. ^ "United States Patent: O'Hanlan". United States Patent & Trademark Office. November 18, 1997.
6. ^ Munro, Jenny (February 17, 2002). "Firm's products working around the world – and above it, too". Greenville News.
7. ^ Tom O'Hanlan; Jon Titus (August 30, 2004). Digital I/O Handbook. Sealevel Systems. ISBN 0975999400.
8. ^ Senior Technical Editor. "Multi-interface serial board is RoHS-compliant". EE Times. Retrieved November 22, 2005. `{{cite web}}`: `|last=` has generic name (help)
9. ^ "PDA 184 to radio interface USB cable systems". FedBizOpps.gov. Retrieved September 5, 2008.
10. ^ Dick, Hughes (February 12, 2010). "Ready for What's Next". Watchdog Journal.
11. ^ Keller, John (12 May 2013). "Navy to buy serial adapters from Sealevel Systems for AN/PRC battlefield radio systems". Military & Aerospace Electronics. Retrieved May 12, 2013.