1. RS485 vs. RS232
- Kev Sib Kis
Rs232 muaj qhov siab tshaj plaws ntawm tsuas yog 15 metres, thaum RS485 txhawb 1200 metres, uas yog qhov haum rau kev tswj lub teeb ntev ntawm theem teeb.
- Kev cuam tshuam los tiv thaiv kev cuam tshuam
Rs232 ib-xaus ntawm cov cim muaj kev cuam tshuam rau kev cuam tshuam, thaum RS485 hloov sib kis tau (Twisted
- Ntau hom khoom nthuav dav
Rs232 tsuas txhawb taw tes taw tes-rau-taw tes, thaum RS485 txhawb nqa lub tsheb npav Topology (32 pab kiag hauv kev tswj hwm ntau yam yuav tsum tau ua ntawm DMX512.
2. RS485 vs. RS422
- Raws Raws Txoj Cai Sib Xws
DMX512 tus qauv yog raws li Rs485 (ib nrab-duplex), thaum RS422 yog cov nqi sib txuas lus ntxiv, yog li RS485 yog RS485 muaj kev lag luam ntau dua thiab muaj txiaj ntsig.
- Yooj Yim Lub Tebchaws Matching
Rs422 yuav tsum ua kom muaj kev cuam tshuam yuam kev, thaum DMX512's RS485 tsuas yog xav tau 120ω terminal resistor, ua kom yooj yim ua kom yooj yim.
3. Rs485 thiab TTL
- Theem kev sib haum
Ttl ({0-5 v) cov cim yog yooj yim thiab tsis tuaj yeem kis tau dhau mus deb; Rs485 qib sib txawv (± 7) tuaj yeem txuas ntxiv mus deb thiab txhim kho kev tiv thaiv kev cuam tshuam.
- Txheem phim
DMX512 Cov Txheej Txheem Nrig Ntaus RS485 Hluav Taws Xob Cov Qauv Hluav Taws Xob. Yog tias TTL siv, cov tshuaj txhuam ntxiv yuav tsum muaj, uas nce nyuaj.
- Cov lus tseem ceeb
Rs485 zoo kawg nkaus phim peb qhov kev xav tau ntawm DMX 50012: ntev ntev, kev cuam tshuam tiv thaiv, thiab ntau yam khoom nthuav dav.
Rs232 muaj qhov nrug deb, RS422 muaj tus nqi siab, thiab qib TTL tsawg, txhua yam uas tsis tuaj yeem hloov Rs485 txoj haujlwm hauv kev tswj hwm kev tswj hwm.
