?????? ???????: ???? ??? ???? ???????? ?????? ??????? ???? ??????? ????????

?????? ???????: ???? ??? ???? ???????? ?????? ??????? ???? ??????? ????????

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

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

???? ????? ????? ?? ????? ???????? ?????? ??????? ???? ??????? ????????: ????? 485? ?????? ????????? ???? ??????? ?????? ????????.

1485 ???

???????? ??? ???????? ?? ????? 485? ????? ?????? RS-485. ?? ????? RS-485 ????? ??? RS-422? ??? ?????? ??? ?????? ?????????? ?? RS-422? ??? ?????? ??? ??????? ????????? ?????? ????? ??????? ????? ??? ?? ???????. ????? ?? RS-485 ?????? ??? ??????? ?? ??? ??????? ?????? ??? ???? ???? ??????? ??????? ????? ??????? ????? ??????. ??? ???? ??????? ?????? ?????? ??? ????? ???? ????? ??? ??? ????. ??? ???? ???? ????? 32 ?????? ????? ??????? ?? ???? ??????? ?????.

????? ?????? ???? ????? RS-485 ?? ????? ??????? ??? ???? ???????? ??? ?????? ????? ???? ???????? ???????? RS-485. ??? ?????? ????? ?????? ?????? ??? ????? RS-485? ???? ????? ???????? ?? ???? ?????? ?????? ??? ???? ??????? ????????? ?? ??? ?????? ??????? ?????????? ??? ???? USB-485 ???? ???????? ?? ????? ??????? ?????????? ?? ???????? ?????????? ?????? ????????? ?????? ?? ???????.

2. ??? ?????? ?????????

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

????? ?????? ???? ??????? ???????? ???????? ?????. ???? ??? ????? ?? ?????? ?????: 0-20 ???? ?????? 0-5 ????? ?0-10 ????.

????? ?????? ??? ???? ????? ????? ????? ?? 0 ??? 20 ???? ?????: ??? ???? ??????? ??? ??? ?????? ?? -40 ??? +80 ???? ?????? ???? ?????? ?? 4 ??? 20 ???? ?????? ?????? ???? ????? ????? 12 ???? ?????? ??? ???? ???? ???? ??????? ???????. ???? ??? ??? ?????? ??????? 120 ???? ?????? ???? ??????? ??? ?????? ???? 16 ???? ?????? ??? 120 ???? ????? / 16 ???? ????? = 7.5 ???? ????? / ???? ?????? ?? ?? 1 ???? ????? ???? ?????? ?? ???? ??????? ?????? 7.5 ???? ?????? ??????? ??????? ?? 12 ???? ????? - 4 ???? ????? = 8 ???? ?????? 8 ???? ????? × 7.5 ???? ????? / ???? ????? = 60 ???? ?????. 60 + (-40) = 20 ???? ?????? ???????? ??? ???? ??????? ??????? ?? 20 ???? ?????. ???? ??????? ???????? ???????? ???????.

3. ??? ??????

① ??????

????? ????? ???????? ?????? ???? ?????? ??????? ??????? (LAN) ??????? ????? ???? ?????? ???? ??? Token Ring ?FDDI ?ARCNET. ???? ????? ??? ???????? ??? ???????? ????? ???????? ????????? ??? ??????. ????? ??? ?? ????????? ?????? ?? ???? ??????? ???????? ??????? ???? ???????? ??????? ?????? ??? ???????? ????????. ??? ?????? ???? ???? ?? ??? ????? ???????? ??????? ????? ???????? ??????? ?????? ???????.

② ??? ??? ???

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

③ ??? ?? ?? ?? ??

GPRS ?? ?????? ?????? ???? ??????? ?????? ????????. ??? ???? ?????? ?????? ????? ???????? ??????? ???????? ????? GSM? ?????? ??? ?????? ??? ???????? ?? ????? ?????? ?? ????????? ????????. ????? ???? ????? ???? ??????? ???????? ???? ???? ?????? GPRS ??? ????? SIM ?? ???? ????? China Mobile ?? China Unicom ?? Telecom ??? ?????? ?????? ???? ??????? ???????? ???? ?? ????? ??? ?????? ??? ???? ?????? ????????.

4. ??? ???????

???? ??????? ??? ??????? ??????????????? ???? ????? ?? ?????? ???? (??? ?? ??? ?????? ???????)? ?????????? ??????? ?? ????????? ???? ???????? ??? ????? ???????.

????? ??? ???????? ???????? ??? ????? ????? ??????? ????????? ?????? ???? ????? ???? ??? ??? 800 ??? ?? ?? ?????? ???????? ????? ?????? ????? ??? ??? 3-4 ????? ???????. ????? ????? ????? ??????? ????? ???????? ????? ????? ??? ?????? ??????? ??????? ?????? ??????? ?????????.

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

???? ????? ?????? ?????? ?? ??? ???? ???? ????????? ??????? ?? ???????? ?????. ???? ???????? ?? ?????? ?? ??? ?????? ?????? ???? ????? ???? ??????????? ??????????? ???????? ??????? ??????? ?? ???? ?????? ???????. ???? ?? ?????? ?? ???? ???????!

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