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RS-485




RS-485 ( - EIA/TIA-485) - . - (1 OSI).

, RS-485, , - . RS-485 () . . ( A) , ( B) - . , "1", "0" . , : "1" , "0" - .

. . , . , , , . , RS-232, (""). , - . . , , , . , .

- / ( ) ( UART ). : RS-422 RS-485.

RS-422 - . . .

RS-485 - . . , .

D (driver) - ;
R (receiver) - ;
DI (driver input) - ;
RO (receiver output) - ;
DE (driver enable) - ;
RE (receiver enable) - ;
A - /;
B - /;
Y - (RS-422);
Z - (RS-422).

RS-485. (RO) UART (RX). (DI) UART (TX). , , - . - (RE) (DE). RE , DE . "0" - , "1" - .

, (AB) (UAB) RO. , . 200 . , UAB > +200 - "1", UAB < -200 - "0". , - . , , .

: (A) , (B) - .

(RAB) 12 . , , . RS-485 c 32 . , 32 .

RS-485 10 /. - 1200 . 1200 , - ().

RS-422 RS-485
/ 1 / 10 32 / 32
1200 1200
10 / 10 /
"1" +2...+10 +1.5...+6
"0" -2...-10 -1.5...-6
-3...+3 -1...+3
-7...+7 -7...+12
200 200
150 250
100 54
4 12
10% 30%

 





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