시리얼통신

http://blog.daum.net/jackryu/66

https://stackoverflow.com/questions/18108932/linux-c-serial-port-reading-writing

https://wiki.kldp.org/HOWTO/html/Serial-Programming/Serial-Programming-HOWTO-3.html#ss3.1

http://neosrtos.com/docs/posix_api/termios.html

https://en.wikibooks.org/wiki/Serial_Programming/termios#Example_terminal_program

http://yeslab.tistory.com/38

http://database.sarang.net/study/glibc/12.htm

http://blog.naver.com/PostView.nhn?blogId=smic2100&logNo=100188797264

http://xenostudy.tistory.com/81

https://kldp.org/node/81368

http://www.cvi.kr/xe/cvi_qna/10679