Báº¡n nhiá»u thá»±c sá»± hiá»ƒu rÃ*nh quÃ¡ch chuáº©n RS485

**uzukiha2901** · 12-05-2020, 02:55 AM

trong suá»‘t ngÃ*nh cÃ´ng nghá»‡, truyá»n tÆ°á»ng hiá»‡n thá»i, nháº±m phá»¥c mÃ¹a biáº¿u viá»‡c káº¿t tiáº¿p chuyá»‡n, lan truyá»n táº£i thÃ´ng tin, cÃ³ ráº¥t nhiá»u loáº¡i chuáº©n má»±c, giao thá»©c truyá»n thÃ´ng tá» ra tháº¿ há»‡, chÃºng min giÃ*u dáº¡ng thuáº*t Ä‘áº¿n nhÆ° RS232, RS485, Ethernet, Modbus TCP,.. trong Ä‘Ã³, táº¥t nhiÃªn cháº³ng thá»ƒ Ä‘á»«ng tÆ°á»ng thuáº*t Ä‘áº¿n viá»‡c truyá»n tin, tháº£o luáº*n thÃ´ng tin giá»¯a láº¯m chá»— nÄƒng trong Ä‘Æ¡n há»‡ thá»‘ng. VÃ* Ä‘Æ°á»£c thá»±c hiá»‡n ná»•i Ä‘iá»u nÃ¨ thÃ¬ cÃ¡c giao thá»©c truyá»n am hiá»ƒu táº¯t Ä‘Æ¡n vai trÃ² quan trá»ng. cÃ¡p rs485 imatek

Ä‘Æ°á»£c giÃºp cáº¡c báº¡n láº¯m thÃªm thÃ´ng bÃ¡o, hiá»ƒu biáº¿t can dá»± tá»›i chuáº©n giao táº¿ RS485, chÃºng trui sáº½ san sáº» má»™t vÃ*i Ä‘iá»u thÃ´ng qua bÃ*i bÃ¡c viáº¿t lÃ¡ch nÃ¨, háºµng Ä‘á»c tháº³ng thÃ´i nÃ*y.

CÃ³ láº½ nhiá»u ngÆ°á»i trong chÃºng má»— cÃ³ tráº¡ng thÃ¡i biáº¿t ráº±ng viá»‡c sá»* dá»¥ng loáº¡i Ä‘Ã*ng truyá»n sáº½ áº£nh hÆ°á»Ÿng ráº¥t to Ä‘áº¿n xÃ´ng trÃªn dÆ°á»›i truyá»n cÅ©ng nhÆ° trÃªn dÆ°á»›i cÃ¡ch má»±c chuáº©n má»±c. Láº¥y tá»‰ dá»¥ cá»‘ thá»ƒ, Ä‘áº¥y chÃ*nh lÃ* RS232, viá»‡c sá»* dá»¥ng lá»‘i lan truyá»n giÃ² cÃ¢n báº±ng há»‰ giá»›i kÃ¬ háº¡n tá»‘c kiÃªng ká»‹ vá»›i khuÃ´n khá»• truyá»n má»±c chÃºng. VÃ* tá»›i RS485, ngÆ°á»i má»— Ä‘Ã£ dÃ¹ng loáº¡i Ä‘Ã*ng truyá»n thÄƒng báº±ng Ä‘á»“ng hai dÃ*nh dáº¥p A, B mÃ* Ä‘á»«ng nhiá»u dÃ£y mass. VÃ* á»Ÿ Ä‘Ã¢y, má»™t vÃ*i ngÆ°á»i láº¯m dáº¡ng cáº£m chá»™ hÆ¡i tÃ² mÃ² dáº*n sá»± cÃ¢n báº±ng trong hai hÃ*ng sáº½ nháº±m táº¡o ra nhÆ° váº¯t nÃ*. Theo táº§m hiá»ƒu, tÃ*n tiá»‡m trÃªn hai dÃ¢y cÃ³ sá»± ngÆ°á»£c rau (phÃ*a phÃ¡t má»±c tÃ*u 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.

nhiá»u tráº¡ng thÃ¡i chá»™ RS485 lÃ* má»™t trong nhá»¯ng chá»n lá»c háº¡ng giÃ*u lÃ*m ty, doanh nghiá»‡p, vÃ¡ trÆ°á»ng há»c tiáº¿n Ä‘Ã¡nh nghiá»‡p. Sá»± tin nÃ*o giÃ*u ná»•i lÃ* nhá» cáº*y vÃ*o kháº£ hay khÃ¡ng nguyÃªn tá»‘ hoi nhiá»…u trong suá»‘t cÃ¡p sá»* dá»¥ng chuáº©n. á»ž Ä‘Ã¢y, chÃºng ta sáº½ cÃ³ má»™t nÃ©m dÃ*nh dáº¥p xoáº¯n (Twisted-pair wire). sá»* dá»¥ng loáº¡i dÃ£y xoáº¯n káº¹p nÃ*y giÃºp chÃºng má»— cÃ³ thá»ƒ trÃ¡nh Ä‘áº·t yáº¿u tá»‘ gÃ¢y nhiá»…u á»Ÿ bÃªn ngoÃ*i Ä‘á»“ng thá»i chá»‘ng pháº¡t xáº¡ nhiá»…u tá»« bÃªn trong suá»‘t. vÃ¬ Ä‘áº¥y, há»“ háº¿t cáº¡c cÃ¡p theo chuáº©n má»±c RS485 Ä‘á»u dÃ¹ng kÃ©p váº¥y xoáº¯n nÃ*o khi hoáº¡t Ä‘á»™ng táº¡i mÃ´i dÃ*i tiáº¿n Ä‘Ã¡nh nghiá»‡p, giÃºp cho viá»‡c váº¡c rá»¥m tÃ*n tiá»‡m phai sÃ*t hÆ¡n.

NhÆ° chÃºng ta háºµng biáº¿t, nhiá»u ráº¥t láº¯m ngÆ°á»i, cÃ´ng trÃ¬nh dÃ¹ng gáº¯t nhÆ° má»™t tiáº¿p chuyá»‡n Ä‘iá»ƒm nháº*n tÃ*n tiá»‡m. VÃ* á»Ÿ chuáº©n má»±c RS485, ngÆ°á»i má»— cÅ©ng sá»* dá»¥ng bÃ¬nh diá»‡n gáº¯t phanh Ä‘Ã¡nh cháº¥m chung. nhÃºt nhÃ¡t nÃ¨, tÃ£ lÃ³t láº¯p Ä‘áº·t, Ä‘iá»u chá»‰nh tÃ*n tiá»‡m, ngÆ°á»i má»— sáº½ pháº£i Ä‘á»ƒ Ã½ cÃ³ hÆ¡n cho thu hÃºt Ä‘á» tiáº¿p cÃ¡u. vÃ¬ sao láº¡i nhÆ° náº¡m, Ä‘Ã³ lÃ* do sá»* dá»¥ng phÆ°Æ¡ng diá»‡n Ä‘áº¥t Ä‘Ã¡nh cháº¥m chung láº¯m thá»ƒ dáº«n Ä‘áº¿n nhiá»u váº¥n Ä‘á» nhÆ° truyá»n sai lá»‡ch tÃ*n tiá»‡m hoáº·c há»ng hÃ³c thÃ¨m bá»‹. VÃ* lÃ´i cuá»‘n Ä‘á» pa trÃªn xáº£y ra lÃ* vÃ¬ viá»‡c chÃªnh chá»‡ch quÃ¡ cao phá»©t Ä‘iá»‡n náº¯m giá»¯a gáº¯t gao á»Ÿ nÆ¡i gá»*i vÃ* chá»‘n dáº¥n so vá»›i ngÆ°á»¡ng táº·ng phÃ©p má»±c nhiá»u thá»ƒ Ä‘áº£ há»ng hÃ³c cÃ¡c mÃ³t bá»‹, náº·ng thá»i tÃ*n giá» thá»«a nháº*n ná»•i sáº½ nhiá»u bÃ¡o cÃ¡o nhiá»u sá»± sai lá»‡ch. Ä‘Ã³ lÃ* lÃ½ vÃ¬ chÆ°ng quÃ¡ trÃ¬nh dÃ¹ng RS485 cáº§n cÃ³ láº¯m cáº©n trá»ng hÆ¡n máº·c dÃ¹ chÃºng ráº» vÃ* hiá»‡u quáº£. nhÃºt nhÃ¡t chÃºng má»— dÃ¹ng Ä‘iá»‡n trá»Ÿ Ä‘áº§u chÃ³t khÃ¡c rau sáº½ gÃ¢y vÃ*o sá»± dá»‹ biá»‡t khÄƒng khÄƒng Ä‘á»‘i xá»* cÃ¹ng giÃ¡ trá»«ng trá»‹ tang khÃ¡ng Ä‘áº·c tÃ*nh toÃ¡n cá»¥m tá»« lá»‘i hÃ*ng xoáº¯n. náº¿u nhÆ° sá»± dá»‹ biá»‡t cháº³ng quÃ¡ lá»›n, chÃºng thÆ°á»ng chá»› hoi vÃ*o áº£nh hÆ°á»Ÿng chi nghiÃªm tÃ´n trá»ng. Tuy nhiÃªn, giáº£ dá»¥ kÃªnh lá»‡ch á»Ÿ má»±c tÃ*u lá»›n hÆ¡n sáº½ cÃ´ng gia tÄƒng Ã¡i tÃ¬nh tráº¡ng nhiá»…u tÃ¢m tÃ*nh hiá»‡n thá»i, váº¡c xáº¡ trÃªn lá»‘i lan truyá»n vÃ* hoi lá»‡ch láº¡c phá»©t tÃ*n hiá»‡u. vá»‹ Ä‘Ã³, cáº§n Ä‘á»ƒ Ã½ vÃ* hiá»‡u chÃ*nh Ä‘iá»‡n tang Ä‘áº§u chÃ³t. VÃ* dÃ¹ báº¡n sá»* dá»¥ng phÆ°Æ¡ng phÃ¡p Ä‘iá»u chá»‰nh nÃ*o thÃ¬ cÅ©ng nhÃ© cÄƒn chá»‰nh trá»‹ má»‡nh dáº*n cá»¯ 100-120 áº¥p á»§.

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