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Sealevel Systems, Inc. is a privately held manufacturer headquartered in Liberty, South Carolina,〔(【引用サイトリンク】url=http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=7982078 )〕 which develops computer circuit I/O boards. ==Company overview== Sealevel Systems was founded by Tom O’Hanlan and his wife Susan, in 1986. In 1991 the company released a dual port serial card that allowed users to set its I/O addresses to any two COM ports. 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.〔〔(【引用サイトリンク】url=http://www.pc104.org/product.php?id=608 )〕 In 1997, O’Hanlan was granted a patent for a communication device that transmitted asynchronous formatted data synchronously.〔(【引用サイトリンク】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 )〕 The company produced the communications card used for positioning the Space Shuttle’s robotic arm in 2002. Tom O’Hanlan and technical author Jon Titus co-authored a book, ''The Digital I/O Handbook'', in 2004. In 2005, Sealevel Systems released the industry’s first RoHS-compliant serial I/O board. In 2008, Sealevel won a defense contract for a USB/serial port cable with a heavily encased circuit board.〔(【引用サイトリンク】url=https://www.fbo.gov/index?s=opportunity&mode=form&id=738455907baa394044a2863c02e310a1&tab=core&_cview=0 )〕 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. In 2013 the company was awarded a sole-source contract for Naval Air Systems Command for this cable. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sealevel Systems」の詳細全文を読む スポンサード リンク
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