Báº¡n giÃ*u thá»±c sá»± hiá»ƒu toÃ*n bÃ©ng chuáº©n má»±c RS485

**uzukiha2901** · 12-05-2020, 02:49 AM

trong suá»‘t ngÃ*nh tiáº¿n Ä‘Ã¡nh nghá»‡, lan truyá»n thÃ´ng tháº¡o hiá»‡n, tá»‘t phá»¥c mÃ¹a cho viá»‡c káº¿t Ä‘áº¥u, truyá»n chuyá»ƒn váº*n thÃ´ng bÃ¡o, nhiá»u ráº¥t nhiá»u loáº¡i chuáº©n, trao thá»©c truyá»n thÃ´ng suá»‘t ra tháº¿ há»‡, chÃºng má»— láº¯m thá»ƒ tÆ°á»ng thuáº*t tá»›i nhÆ° RS232, RS485, Ethernet, Modbus TCP,.. trong suá»‘t Ä‘áº¥y, táº¥t nhiÃªn khÃ´ng thá»ƒ khÃ´ng thuáº*t Ä‘áº¿n viá»‡c lan truyá»n tin tÆ°á»Ÿng, Ä‘Ã*m Ä‘áº¡o thÃ´ng bÃ¡o giá»¯a nhiá»u nÆ¡i hay trong Ä‘Æ¡n há»‡ thá»‘ng. VÃ* Ä‘áº·ng thá»±c hiá»‡n Ä‘áº·ng Ä‘iá»u nÃ¨ thá»i danh thiáº¿p trao thá»©c truyá»n thÃ´ng tháº¡o táº¯t má»™t vai trÃ² quan yáº¿u. cÃ¡p rs485 imatek

Ä‘áº·ng giÃºp cáº¡c báº¡n nhiá»u thÃªm thÃ´ng bÃ¡o, hiá»ƒu biáº¿t liÃªn tÆ°á»Ÿng tá»›i chuáº©n má»±c giao dá»‹ch RS485, chÃºng tui sáº½ san sá»›t má»™t vÃ*i Ä‘iá»u duyá»‡t bÃ*i viáº¿t lÃ¡ch nÃ*y, thoáº£ Ä‘á»c tháº³ng bÄƒng Ã´i thÃ´i nÃ*o lÃ*.

CÃ³ láº½ cÃ³ ngÆ°á»i trong suá»‘t chÃºng ta giÃ*u tráº¡ng thÃ¡i biáº¿t ráº±ng viá»‡c dÃ¹ng loáº¡i Ä‘Ã*ng lan truyá»n sáº½ hÃ¬nh hÆ°á»Ÿng ráº¥t to Ä‘áº¿n lao dáº¡o lan truyá»n cÅ©ng nhÆ° lá»›p cÃ¡ch cá»§a chuáº©n. Láº¥y vÃ* dá»¥ gáº¯ng dáº¡ng, Ä‘Ã³ chÃ*nh lÃ* RS232, viá»‡c sá»* dá»¥ng lá»‘i truyá»n cháº³ng cÃ¢n báº±ng há»Ÿ giá»›i háº¡n váº*n xá»™c táº§ng vá»›i khuÃ´n khá»• truyá»n cá»¥m tá»« chÃºng. VÃ* Ä‘áº¿n RS485, ngÆ°á»i má»— háº£ sá»* dá»¥ng loáº¡i Ä‘Æ°á»ng truyá»n thÄƒng báº±ng vá»›i hai dÃ*nh lÃ*u A, B mÃ* cháº³ng cÃ³ dÃ*nh dÃ¡ng mass. VÃ* á»Ÿ Ä‘Ã¢y, má»™t vÃ*i ngÆ°á»i nhiá»u tráº¡ng thÃ¡i cáº£m tháº¥y hÆ¡i tÃ² mÃ² cháº¡y sá»± cÃ¢n báº±ng trong suá»‘t hai quy hÃ*ng sáº½ ná»•i táº¡o vÃ*o nhÆ° rá»©a nÃ*o. Theo cá»¯ hiá»ƒu, tÃ*n hiá»‡u trÃªn hai quy hÃ*ng cÃ³ sá»± ngÆ°á»£c nhau (bÃªn phÃ¢n phÃ¡t cá»¥m tá»« cao >< bÃªn phÃ¡t má»©c tháº¥p). CÅ©ng chÃ*nh vÃ¬ Ä‘áº·c Ä‘iá»ƒm nÃ*y mÃ* hiá»‡n cÃ³ ráº¥t nhiá»u ngÆ°á»i, há»‡ thá»‘ng sá»* dá»¥ng loáº¡i chuáº©n trÃªn.

giÃ*u thá»ƒ chá»™ RS485 lÃ* Ä‘Æ¡n trong suá»‘t nhá»¯ng chá»n lá»±a má»©c cÃ³ Ä‘Ã¡nh ty, doanh nghiá»‡p, vÃ¡ trÆ°á»ng há»c cÃ´ng nghiá»‡p. Sá»± tin nÃ¨ giÃ*u Ä‘Æ°á»£c lÃ* nhá» váº£ vÃ*o kháº£ nÄƒng khÃ¡ng nguyÃªn tá»‘ hoi sÃ¡ch nhiá»…u trong cÃ¡p dÃ¹ng chuáº©n. á»ž Ä‘Ã¢y, chÃºng ta sáº½ láº¯m Ä‘Æ¡n nÃ©m dÃ¢y xoáº¯n (Twisted-pair wire). sá»* dá»¥ng loáº¡i Ä‘áº§u hÃ*ng xoáº¯n cáº·p nÃ*y giÃºp chÃºng ta cÃ³ tráº¡ng thÃ¡i trÃ¡nh Ä‘á»ƒ nguyÃªn tá»‘ gÃ¢y nhiá»…u á»Ÿ phÃ*a ngoÃ*i song song chá»‘ng phÃ¡t xáº¡ nhÅ©ng nhiá»…u tá»± Ä‘áº±ng trong suá»‘t. vá»‹ Ä‘Ã³, há»“ háº¿t danh thiáº¿p cÃ¡p theo chuáº©n RS485 Ä‘á»u sá»* dá»¥ng Ä‘Ã´i dÃ*nh dÃ¡ng xoáº¯n nÃ*y lÃ³t hoáº¡t Ä‘á»¥ng táº¡i mÃ´i dÃ*i lÃ*m nghiá»‡p, giÃºp cho viá»‡c pháº¡t tÃ¡n phá»…u tÃ*n tiá»‡m Ä‘i dÃ*y hÆ¡n.

NhÆ° chÃºng ta thoáº£ biáº¿t, láº¯m ráº¥t giÃ*u ngÆ°á»i, Ä‘áº£ Ä‘á»‡ trÃ¬nh sá»* dá»¥ng cÃ¡u nhÆ° Ä‘Æ¡n tiáº¿p tá»¥c cháº¥m nháº*n tÃ*n hiá»‡u. VÃ* á»Ÿ chuáº©n RS485, ngÆ°á»i min cÅ©ng dÃ¹ng bÃ¬nh diá»‡n gáº¯t gao Ä‘á»ƒ Ä‘áº£ cháº¥m chung. khi nÃ*o lÃ*, lÃ¡t láº¯p Ä‘Æ°á»£c, Ä‘iá»u chá»‰nh tÃ*n tiá»‡m, ngÆ°á»i ta sáº½ náº¿u chÃº Ã½ nhiá»u hÆ¡n táº·ng thu hÃºt Ä‘á» pa tiáº¿p gáº¯t. Táº¡i sao láº¡i nhÆ° tháº¿, Ä‘Ã³ lÃ* vÃ¬ chÆ°ng sá»* dá»¥ng máº·t Ä‘áº¥t Ä‘Ã¡nh Ä‘iá»ƒm chung nhiá»u tráº¡ng thÃ¡i dáº«n tá»›i láº¯m cuá»‘n Ä‘á» pa nhÆ° lan truyá»n mÃ©o mÃ³ tÃ*n hiá»‡u hay lÃ* hÆ° Ä‘Ã³i bá»‹. VÃ* cuá»™n Ä‘á» pa trÃªn xáº£y ra lÃ* vá»‹ viá»‡c chÃªnh chá»‡ch quÃ¡ cao bay Ä‘iá»‡n cá»¥ giá»¯a báº³n á»Ÿ nÆ¡i gá»*i vÃ* chá»— thá»«a nháº*n so Ä‘á»“ng ngÆ°á»¡ng cho phÃ©p thuáº*t má»©c cÃ³ tráº¡ng thÃ¡i Ä‘Ã¡nh há»ng hÃ³c cÃ¡c tÆ¡ mÃ*ng bá»‹, náº·ng thÃ¬ tÃ*n bÃ¢y chá»« dáº¥n ná»•i sáº½ cÃ³ Ã*t láº¯m sá»± sai lá»‡ch. Ä‘áº¥y lÃ* lÃ½ bá»Ÿi quÃ¡ Ä‘á»‡ trÃ¬nh dÃ¹ng RS485 cáº§n láº¯m láº¯m cáº©n trá»ng hÆ¡n máº·c dÃ¹ chÃºng ráº» vÃ* tiá»‡m trÃ¡i. Ä‘áº¡i há»“i chÃºng má»— sá»* dá»¥ng Ä‘iá»‡n trá»Ÿ Ä‘áº§u chÃ³t khÃ¡c nhau sáº½ hoi ra sá»± khÃ¡c biá»‡t cá»‘ Ä‘á»‹nh Ä‘á»‘i vá»›i giÃ¡ trá»«ng trá»‹ tang khÃ¡ng kÃ*n tÃ*nh náº¿t háº¡ng Ä‘Ã*ng dÃ*nh dÃ¡ng xoáº¯n. náº¿u nhÆ° sá»± dá»‹ biá»‡t cháº£ quÃ¡ lá»›n, chÃºng thÆ°á»ng cháº³ng gÃ¢y ra áº£nh hÆ°á»Ÿng chi nghiÃªm quÃ½ trá»ng. Tuy nhiÃªn, giáº£ dá»¥ chÃªnh chá»‡ch á»Ÿ má»±c to hÆ¡n sáº½ lÃ*m gia tÄƒng tÃ¬nh Ã¡i tráº¡ng sÃ¡ch nhiá»…u xem hiá»‡n thá»i, váº¡c xáº¡ trÃªn lá»‘i truyá»n vÃ* gÃ¢y mÃ©o mÃ³ bay tÃ*n tiá»‡m. Do Ä‘Ã³, cáº§n Ä‘á»ƒ Ã½ vÃ* hiá»‡u Ä‘Ã*nh Ä‘iá»‡n trá»Ÿ Ä‘áº§u cuá»‘i. VÃ* Æ¡ báº¡n sá»* dá»¥ng phÆ°Æ¡ng phÃ¡p Ä‘iá»u chá»‰nh nÃ*y thÃ¬ cÅ©ng nhÃ© cÄƒn chá»‰nh trá»«ng pháº¡t máº¡ng bay khoáº£ng 100-120 áº¥p á»§.

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