Sealevel Systems
{{COI|date=April 2015}}
{{Infobox company
| name = Sealevel Systems, Inc.
| logo = Sealevel Systems logo.png
| type = Private
| industry = Hardware & software
| foundation = 1986
| location_city = Liberty, South Carolina
| location_country = United States
| key_people = Tom O’Hanlan, Founder, CEO
| products = Computing/HMI, serial boards, I/O boards
| net_income = Not Reported
| website = {{URL|http://www.sealevel.com/}}
}}
Sealevel Systems, Inc. is a privately held manufacturer headquartered in Liberty, South Carolina,{{cite web|title=Company Overview of Sealevel Systems, Inc.|url=http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=7982078|archive-url=https://web.archive.org/web/20090712152019/http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=7982078|url-status=dead|archive-date=July 12, 2009|publisher=Bloomberg Businessweek|accessdate=May 29, 2014}} which develops computer circuit I/O boards.
Company overview
Sealevel Systems was founded by Tom O’Hanlan and his wife Susan, in 1986.{{cite web|last=Control Engineering|first=Staff|title=Data Risk for RS-485 Users?|url=http://www.controleng.com/industry-news/single-article/data-risk-for-rs-485-users/cf9b719cc57bf782bcf3d868d5aee8e2.html|publisher=Control Engineering|accessdate=May 1, 2008}}
In 1991 the company released a dual port serial card that allowed users to set its I/O addresses to any two COM ports.{{cite book|last=Salami|first=Joe|title=Gain Control Over COM3 and 4 with COMM+232|date=April 16, 1991|location=PC Magazine|pages=41|url=https://books.google.com/books?id=_OEk1QOJYw0C&dq=sealevel+first+serial+baord+for+PC&pg=PT60}} 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.{{cite web|title=Spec Sheet|url=http://www.pc104.org/product.php?id=608|publisher=PC/104 Consortium|accessdate=May 29, 2014}}
In 1997, O’Hanlan was granted a patent for a communication device that transmitted asynchronous formatted data synchronously.{{cite web|title=United States Patent: O'Hanlan|url=http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=%22OHanlan+Thomas%22.INNM.&OS=IN/%22OHanlan+Thomas%22&RS=IN/%22OHanlan+Thomas%22|publisher=United States Patent & Trademark Office|date=November 18, 1997}} The company produced the communications card used for positioning the Space Shuttle's robotic arm in 2002.{{cite news|last=Munro|first=Jenny|title=Firm's products working around the world – and above it, too.|newspaper=Greenville News|date=February 17, 2002}} Tom O’Hanlan and technical author Jon Titus co-authored a book, The Digital I/O Handbook, in 2004.{{cite book|title=Digital I/O Handbook|date=August 30, 2004|isbn=0975999400|author=Tom O'Hanlan |author2=Jon Titus|publisher=Sealevel Systems }}
In 2005, Sealevel Systems released the industry's first RoHS-compliant serial I/O board.{{cite web|last=Senior Technical Editor|title=Multi-interface serial board is RoHS-compliant|url=http://www.eetimes.com/document.asp?doc_id=1298293|publisher=EE Times|accessdate=November 22, 2005}} In 2008, Sealevel won a defense contract for a USB/serial port cable with a heavily encased circuit board.{{cite web|title=PDA 184 to radio interface USB cable systems|url=https://www.fbo.gov/index?s=opportunity&mode=form&id=738455907baa394044a2863c02e310a1&tab=core&_cview=0|publisher=FedBizOpps.gov|accessdate=September 5, 2008}} 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.{{cite web|last=Dick|first=Hughes|title=Ready for What's Next|url=http://www.journalwatchdog.com/business/522-ready-for-whats-next|publisher=Watchdog Journal|date=February 12, 2010}} In 2013 the company was awarded a sole-source contract for Naval Air Systems Command for this cable.{{cite web|last=Keller|first=John|title=Navy to buy serial adapters from Sealevel Systems for AN/PRC battlefield radio systems|date=12 May 2013 |url=http://www.militaryaerospace.com/articles/2013/05/Sealevel-radio-adapters.html|publisher=Military & Aerospace Electronics|accessdate=May 12, 2013}}