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????? ????? ????? ?? ????? ?????? RS-YL-*-4 ?? ????? ?????? ????? ???? ???????? ????? ???? ????? ????? ?????? ?????? ?????? ?????? ????????? ?????? ????? ?????? ??????. ????? ??? ???? ????? ??????? ?????? ????? ??????? ?????? ????? ??????? ??????????? ???? ????? ???????? ????? ?????? ??? ????? ????? ?????. ???? ??? ?????? ????? ?????? ??? ????? ??????? ????? ???? ????? ?????? ?? ??? ?????? ????? ????? ???? ???????. ?????? ????? ?????? ?? ???? ?????? ?? ???? ???? ????? ??????. ??? ????? ?????? ??????? ??????? ??? ?????? ??????? ??? ???? ?? ?????? ?? ??????? ????? ????? ?? ?????????.

???? ??? ?????? ?????? ??????? 200 ???? ????? ?????? ??????? ??????? ?????? GB/T 21978.2-2014 "??????? ??? ???? ???????".

?????? ??? ?????? ????? ??? ?? ??? ???? ????? ?? ??????? ??????? ?????? ????? ?????? ????? ???? ?????? ???? ?????? ??????? ??? ????? ??? ????? ????? ?? ???? ???????? ????? ?????? ???? ???. ????? ??????? ????????? ????? ??????? ??? ????? ?????? ???? ???? ?????? ??? ????? ?????? ??????? ?????? ?? ?????? ?????? ???????. ????? ??? ??????? ?? ????? ?????? ????? ???? ?????? ????? ?? ???? ????? ?????. ????? ?????? ???? ????? ???????? ?????? ?? ??????? ???? ????? ????? ????? ??? ????? ?????? ????? ?????? ?? ???? ?????. ????? ???? ??? ?????? ????? ?????? ????? ????? ?????? ???? ?????? ?????? ??? ???? ???????? ????? ???????? ?????? ???????? ?????? ????? ?? ?????.

???? ???? ??? ????? ????? ?? ????? ?????? ????? ??? ??? ???? ?????? 44 ????? ?? ??? ???????? ??????? ?????? GB/T21978-2014 ????? ??? ?????. ????? ??????? ??? ????? ???????: RS485 ?????? ?????.

???? ??????? ????? ????? ?? ????? ?????? ?? ???????? ??? ????? ??? ????? ??????? ??????? ?????? ??????? ???????? ????????? ??????? ??????? ?????? ????? ????????? ??? ??? ???? ?? ?????? ???? ??????? ????? ??????? ???? ??????? ???? ??????? ??? ??? ???. ????? ?? ???? ?????? ????? ?????? ?? ?????????? ?????? ??????? ??????? ?????? ???? ?????? ????? ?????? ???????.

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??????? ???????? ??????? ?????? ?????? ???????? ?? ?????? ??? ???? ????? ?? ???? ?????????.

[拓展名称] ???? ?????? ????? ??????? ?? ??????? ??? ???? ???? ?? ???????: ?? ????? ?????? ?????? ??????? ????????? ??? ???? ?? ??? ??????? ??? ?????? ????? ????????? ??????????? ??????? ?? ??????? ??????? ???????.