Dab tsi yog Rs-485 interface? Dab tsi yog nws yam ntxwv piv nrog Rs-232-C interface? Vim yog cov tsos ntxov ntawm Rs-232-C interface txheem, muaj ib qho yooj yim rau kev puas tsuaj ntawm cov qib siab: (1) Lub teeb liab qib siab dua nrog TTL Circuit Court. (2) Tus Ntaus Hloov yog tsawg. Nyob rau hauv asynchronous kis, tus nqi baud yog 20kbps. (3) Lub interface siv txoj kab teeb liab thiab daim paib rov qab los ua ib qho av sib kis tau. Qhov chaw sib kis no tau sib zog no rau kev cuam tshuam hom hom kev cuam tshuam, yog li lub suab nrov sib cuam tshuam tsis muaj zog. (4) Qhov chaw kis tau muaj tsawg. Tus qauv ntsuas tus nqi ntawm qhov kev sib kis tau tshaj plaws yog 50 ko taw, tab sis nws tsuas yog siv tau ntawm txog 50 meters. Hauv kev pom ntawm qhov tsis txaus ntseeg ntawm Rs-232-C, qee cov qauv tshiab interface 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 cav "1" yog sawv cev los ntawm cov hluavtaws sib txawv ntawm ob kab li + (2-6) v; Lub logic "0" yog sawv cev los ntawm cov hluav taws xob sib txawv ntawm ob kab kev sib txuas lus yog qis dua ntawm cov qib hluav taws xob qis dua ntawm cov qib siab, yog li nws tau yooj yim txuas nrog TTL Circuit Court. 2. Cov ntaub ntawv siab tshaj plaws ntawm Rs-485 yog 10 MB PS3. Qhov Rs-485 interface yog kev sib xyaw nrog tus tsav tsheb sib npaug thiab cov neeg muaj zog, uas tau txhim kho kev cuam tshuam rau kev cuam tshuam muaj peev xwm, qhov ntawd yog, kev tawm tsam cov suab sib xyaw muaj peev xwm yog qhov zoo. 4. Tus qauv tus qauv ntawm qhov kev sib kis tau ntev tshaj plaws 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 transceiver nyob hauv npav, uas yog, lub chaw nres tsheb muaj peev xwm. Qhov Rs-485 interface tso cai rau kev sib txuas ntawm 128 transceivers hauv npav. Ntawd yog, nws muaj peev xwm muaj ntau qhov chaw nres tsheb, yog li cov neeg siv tau yooj yim teeb tsa cov khoom siv network los ntawm kev siv ib qho RS-485 interface. Rs-485 interface yog qhov nyiam tshaj plaws rau siab tshaj vim tias nws cov tshuaj tiv thaiv zoo nkauj, kev sib txuas lus ntev ntev thiab ntau qhov chaw nres tsheb. Vim tias ib nrab-duplex network muaj los ntawm RS485 feem ntau tsuas yog xav tau ob xaim, RS485 cuam tshuam rau cov kev sib tw khub khub sib tw. Lub 9-lub ntsiab lus ntsaws ntswj ntawm DB-9 yog siv rau RS485 interface terminor, DB-9 (PIN) yog siv rau keyboard interface rs485 txuas nrog keyboard.