Rs-485 (Cov Qauv Pom Zoo 485) yog ib qho kev sib txuas lus dav dav rau kev sib txuas lus thiab cov ntawv thov kev lag luam. Nws txhais cov yam ntxwv hluav taws xob ntawm lub kaw lus hluav taws xob sib txawv, ua kom cov ntaub ntawv txhim khu kev qha tau sib kis thiab hauv cov chaw muaj hluav taws xob. Hauv qab no yog cov txheej txheem cej luam ntawm Rs-485, nws cov yam ntxwv, thiab nws cov ntawv thov.
1. Cov yam ntxwv tseem ceeb ntawm Rs-485
a. Sib txawv kos npe
Rs-485 siv ob lub xov hlau (a thiab b) los xa cov ntaub ntawv sib txawv. Qhov sib txawv ntawm ob lub xov hluav taws xob sawv cev rau lub teeb liab, ua rau nws tiv taus hluav taws xob hauv hluav taws xob (EMI) thiab suab nrov.
b. Multi -} poob peev xwm
Rs -} 485 txhawb nqa cov kev sib txuas lus ntau, tso cai rau32 khoom siv(lossis ntau dua nrog cov rov qab) kom txuas rau ntawm ib lub tsheb npav. Qhov no ua rau nws zoo rau tes hauj lwm nrog ntau cov khoom siv.
c. Ntev - deb kev sib txuas lus
Rs-485 tuaj yeem xa cov ntaub ntawv hla mus txog1,200 meters(ntawm cov ntaub ntawv qis dua) tsis muaj teeb meem tseem ceeb.
d. Cov Ntaub Ntawv Siab
Rs-485 txhawb cov ntaub ntawv tus nqi ntawm li10 MBPSTshaj dhau qhov kev ncua deb, ua nws haum rau ob qho qis qis - ceev thiab siab-}} kev siv ceev.
e. Ib nrab -} duplex thiab tag nrho- duplex hom
Rs-485 tuaj yeem ua haujlwm hauvib nrab - hom duplex(ob {- log hlau configuration) lossisTag nrho - hom duplex(Plaub {{- xaim teeb tsa), nyob ntawm daim ntawv thov yuav tsum tau ua.
2. Cov yam ntxwv hluav taws xob
Ntau theem: Rs-485 siv ib qho hluav taws xob sib txawv ntau ntawm-7v rau +12 vlos sawv cev rau qib kev ntseeg siab.
Hom nquag - hom muaj ntau: Tus qauv tso cai rau ib qho kev sib xws - hom voltage ntau ntawm-7v rau +12 v, ua kom muaj kev sib txuas lus zoo hauv kev sib txuas lus tsis nrov.
Terminations Desors: Txhawm rau tiv thaiv cov paib teeb liab, cov lus txiav txim siab tiv thaiv (feem ntau120 ohms) tau siv nyob rau hauv ob qho kawg ntawm kev sib txuas lus.
3. Kev siv ntawm Rs-485
Rs-485 tau siv dav hauv ntau yam kev lag luam vim nws lub zog thiab versatility:
Muaj Automation: Cov sensors sib txuas, cov actuatators, thiab cov tswj hwm hauv cov nroj tsuag kev tsim khoom.
Kev siv tshuab: Tswj HVAC cov tshuab, teeb pom kev zoo, thiab kev ruaj ntseg.
Kev tham xov tooj: Cuam tshuam nrog cov qauv thiab lwm yam khoom siv sib txuas lus.
Kev Tswj Xyuas Lub Zog: Saib xyuas thiab tswj lub zog faib hluav taws xob.
Kev mus: Kev sib txuas lus hauv kev tsheb ciav hlau, tswj kev tsheb, thiab tsheb network.
4. Qhov zoo ntawm Rs-485
Suab nrov tiv thaiv: Kev piav qhia sib txawv ua rau Rs-485 muaj lub suab nrov thiab cuam tshuam.
Ntev - deb kev sib txuas lus: Haum rau cov ntawv thov yuav tsum tau siv cov ntaub ntawv sib kis dhau qhov kev ncua ntev.
Tus nqi - ua hauj lwm zoo: Cov khoom siv hluav taws xob yooj yim thiab cov nqi kho vajtse tsawg ua rau nws xaiv kev lag luam.
Kev loj: Txhawb nqa ntau yam khoom siv ntawm ib lub tsheb npav, koom nrog cov qauv siv network convible.
5. Kev sib piv nrog lwm cov qauv
Rs-232: Rs {- 485 txhawb kev ncua ntev, thiab ntau- 232, uas yog txwv rau kev sib txuas lus taw tes-rau-taw tes.
Rs-422: Rs - 485 yog zoo ib yam li rs {{5} {{52 tab sis feem ntau siv rau kev sib txuas lus-rau-taw tes.
6. Qhov txwv ntawm Rs-485
Kev nyuaj nyob rau hauv multi -} kev tes hauj lwm: Tswj kev sib txuas lus nruab nrab ntawm ntau cov khoom siv yuav tsum tau chaw nyob zoo thiab raws tu qauv kev siv.
Deb vs. kev lag luam ceev -} tawm: Cov ntaub ntawv ntau dua txo qhov kev sib txuas lus siab tshaj plaws.
Tag
Rs - 485 yog qhov sib zog thiab kev sib txuas lus ntau yam dav siv hauv kev lag luam thiab cov ntawv thov lag luam. Nws lub peev xwm los txhawb nqa ntev {}} Kev sib txuas lus deb, thiab lub suab nrov nrov ua rau nws xaiv tau zoo rau ntau lub tshuab. Los ntawm kev nkag siab nws cov nta thiab kev siv, engineers tuaj yeem siv Rs-485 hauv lawv cov qauv tsim kom ua tiav cov ntaub ntawv txhim khu kev qha thiab muaj txiaj ntsig zoo.
