RS-485 interface yog dab tsi? Dab tsi yog nws cov yam ntxwv piv nrog RS-232-C interface? Vim tias qhov tshwm sim thaum ntxov ntawm RS-232-C interface tus qauv, muaj qee qhov kev tsis txaus ntseeg, feem ntau suav nrog plaub lub ntsiab lus hauv qab no: (1) Lub teeb liab theem ntawm lub interface yog siab, uas yooj yim rau kev puas tsuaj rau nti ntawm lub interface Circuit Court. , thiab vim tias nws tsis sib haum nrog TTL theem, nws yog ib qho tsim nyog yuav tsum tau siv cov theem hloov pauv mus txuas nrog TTL Circuit Court. (2) Cov kis tau tus mob tsawg. Hauv kev sib kis asynchronous, tus nqi baud yog 20Kbps. (3) Lub interface siv cov kab teeb liab thiab cov kab teeb liab rov qab los ua ib daim ntawv sib kis hauv av. Qhov kev sib kis hauv av no muaj feem cuam tshuam rau hom kev cuam tshuam, yog li lub suab nrov cuam tshuam tsis muaj zog. (4) Qhov kev ncua deb yog txwv. Tus qauv tus nqi ntawm qhov siab tshaj plaws kis tau tus mob yog 50 ko taw, tab sis nws tsuas yog siv tau li ntawm 50 meters. Raws li qhov tsis txaus ntawm RS-232-C, qee cov qauv kev sib txuas tshiab tau tshwm sim, thiab RS-485 yog ib qho ntawm lawv. Nws muaj cov yam ntxwv hauv qab no: 1. Cov yam ntxwv hluav taws xob ntawm RS-485: lub logic "1" yog sawv cev los ntawm qhov sib txawv ntawm ob kab li + (2-6) V; Lub logic "0" yog sawv cev los ntawm qhov sib txawv ntawm qhov sib txawv ntawm ob kab yog-(2-6) V. Lub interface teeb liab theem qis dua li ntawm RS-232-C, yog li nws tsis yooj yim rau kev puas tsuaj ntawm cov nti interface Circuit Court, thiab qib no yog sib xws nrog TTL theem, uas tuaj yeem txuas tau yooj yim nrog TTL Circuit Court. 2. Qhov siab tshaj plaws cov ntaub ntawv kis tus nqi ntawm RS-485 yog 10 MB PS3. Lub RS-485 interface yog kev sib xyaw ntawm cov neeg tsav tsheb sib npaug thiab cov neeg txais kev sib txawv, uas ua rau muaj peev xwm tiv thaiv hom cuam tshuam, uas yog, lub peev xwm los tiv thaiv lub suab nrov yog qhov zoo. 4. Tus qauv tus nqi ntawm qhov siab tshaj qhov sib kis ntawm RS-485 interface yog 4,000 ko taw, uas tuaj yeem ncav cuag 3,000 meters. Tsis tas li ntawd, RS-232-C interface tsuas yog tso cai rau txuas ib lub transceiver ntawm lub tsheb npav, uas yog, ib qho chaw nres tsheb muaj peev xwm. RS-485 interface tso cai rau kev sib txuas ntawm 128 transceivers ntawm lub tsheb npav. Ntawd yog, nws muaj peev xwm ntawm ntau lub chaw nres tsheb, kom cov neeg siv tuaj yeem tsim cov cuab yeej siv tau yooj yim los ntawm kev siv ib qho RS-485 interface. RS-485 interface yog qhov nyiam serial interface vim nws qhov kev cuam tshuam zoo rau lub suab nrov, kev sib kis ntev thiab muaj peev xwm ntau lub chaw nres tsheb. Vim hais tias ib nrab-duplex network tsim los ntawm RS485 interfaces feem ntau tsuas yog xav tau ob lub xov hlau, RS485 interfaces txhua tus txais yuav shielded twisted khub kis tau tus mob. Lub 9-core plug socket ntawm DB-9 yog siv rau RS485 interface connector, DB-9 (qhov) yog siv rau interface nrog ntse davhlau ya nyob twg RS485, thiab DB-9 (pin) yog siv rau keyboard interface RS485 txuas nrog keyboard.