RS-422 yog tus qauv kev sib txuas lus sib txuas uas qhia txog cov khoom siv hluav taws xob thiab kev ua haujlwm ntawm cov ntaub ntawv sib npaug. Nws yog feem ntau siv rau hauv kev lag luam thiab kev tshaj lij kev siv qhov twg yuav tsum muaj kev sib txuas lus ntev thiab suab nrov.
Txhawm rau tsim kom muaj kev sib txuas RS -422, koj yuav xav tau ib lub cable uas txhawb nqa qhov sib txawv thiab muaj cov khoom sib txuas tsim nyog. RS-422 siv ib khub twisted cable, nrog ib khub rau kev xa cov ntaub ntawv thiab lwm khub rau tau txais cov ntaub ntawv. Lub cable yuav tsum muaj tus yam ntxwv impedance ntawm 100 ohms.
Feem ntau siv cable rau RS -422 yog cov twisted khub shielded cable, feem ntau hu ua STP (Shielded Twisted Pair) cable. Lub shielding pab tiv thaiv lub teeb liab los ntawm kev cuam tshuam sab nraud thiab tswj kev ncaj ncees ntawm cov ntaub ntawv xa mus. Cov kev sib tw twisted configuration txo qhov cuam tshuam rau lub suab nrov thiab crosstalk.
Thaum xaiv RS -422 cable, koj yuav tsum xav txog cov hauv qab no:
Cable Hom: Raws li tau hais ua ntej, twisted khub shielded cables (STP) feem ntau yog siv rau RS-422 kev sib txuas. Nco ntsoov xaiv ib lub cable nrog qhov tsim nyog impedance ntsuas, feem ntau 100 ohms.
Cable Length: RS-422 txhawb nqa cable ntev dua piv rau lwm cov qauv kev sib txuas lus. Txawm li cas los xij, qhov siab tshaj plaws nyob deb yuav nyob ntawm seb yam xws li cov ntaub ntawv tus nqi, cable zoo, thiab ib puag ncig. Rau kev ncua ntev, koj yuav tau siv cov repeaters lossis cov teeb liab boosters.
Connectors: RS-422 feem ntau siv DB9 lossis DB25 connectors. Qhov kev xaiv ntawm connector nyob ntawm cov khoom tshwj xeeb uas koj tab tom txuas. Xyuas kom tseeb tias cov cable koj xaiv muaj cov khoom sib txuas tsim nyog ntawm ob qho kawg rau kev sib txuas tsis sib haum.
Kev xaim: RS-422 xav tau ob lub twisted khub rau kev sib txuas lus puv-duplex. Cov kis tau tus mob thiab tau txais cov khub tau sau tias yog A thiab B. Nws yog ib qho tseem ceeb uas yuav tsum ua raws li kev teeb tsa kev teeb tsa kom raug kom paub meej tias cov teeb liab kis tau zoo. Cov txheej txheem txuas feem ntau yog hu ua "4-wire" lossis "full-duplex" hom.
Kev txiav txim siab ib puag ncig: Yog tias koj npaj yuav siv RS-422 nyob rau hauv ib puag ncig hnyav lossis qhov uas yuav muaj kev pheej hmoo ntawm electromagnetic cuam tshuam (EMI), koj yuav tsum xav txog cov cables uas muaj kev tiv thaiv ntxiv lossis tiv thaiv kev ya raws, qhov kub thiab txias, thiab kev nyuaj siab ntawm lub cev.
Nws yog ib qho tsim nyog sau cia tias RS -422 yog tus qauv kev sib txuas lus taw tes rau taw tes, txhais tau tias nws txhawb kev sib txuas lus ntawm ob lub cuab yeej. Yog tias koj xav tau kev sib txuas lus ntawm ntau yam khoom siv hauv lub network, feem ntau koj yuav xav tau cov cuab yeej ntxiv xws li RS -422 converters lossis multipoint interfaces.
Thaum teeb tsa RS-422 kev sib txuas, nws ib txwm pom zoo kom sab laj cov ntaub ntawv thiab cov lus qhia tshwj xeeb uas muab los ntawm cov cuab yeej tsim khoom kom ntseeg tau tias muaj kev xaiv thiab kev teeb tsa ntawm lub cable.
