[AIPU-WATON] Qhov txawv ntawm RS232 thiab RS485 yog dab tsi?

Cov txheej txheem sib txuas lus ua ke ua lub luag haujlwm tseem ceeb hauv kev txuas cov khoom siv thiab ua kom muaj kev sib pauv ntaub ntawv. Ob tus qauv siv dav dav yogRS232thiabRS485Cia peb kawm txog lawv qhov sib txawv.

· RS232Cov Txheej Txheem

LubRS232Qhov interface (tseem hu ua TIA/EIA-232) yog tsim los rau kev tswj kev sib txuas lus serial. Nws pab txhawb kev ntws cov ntaub ntawv ntawm Cov Khoom Siv Chaw Nres Nkoj Cov Ntaub Ntawv (DTE), xws li cov davhlau ya nyob twg lossis cov transmitters, thiab Cov Khoom Siv Sib Txuas Lus Cov Ntaub Ntawv (DCE). Nov yog qee cov ntsiab lus tseem ceeb txog RS232:

1. Hom Kev Ua Haujlwm:

   • RS232txhawb nqa ob qho tib sipuv-duplexthiabib nrab-duplexhom.
   • Hauv hom full-duplex, cov ntaub ntawv tuaj yeem xa thiab tau txais tib lub sijhawm siv cov xov hlau sib cais rau kev xa thiab txais.
   • Hauv hom ib nrab-duplex, ib kab nkaus xwb ua haujlwm xa thiab txais, tso cai rau ib kab ib zaug.

2. Kev Sib Txuas Lus Deb:

   • RS232 yog tsim raukev ncua luv luvvim muaj kev txwv ntawm lub zog teeb liab.
   • Qhov deb ntev dua yuav ua rau lub teeb liab puas tsuaj.

3. Cov Qib Voltage:

   • RS232 sivcov theem voltage zoo thiab tsis zoorau kev teeb liab.

4. Tus naj npawb ntawm cov neeg uas koj paub:

   • Feem ntau, RS232 cable muaj cov khoom no:9 txoj hlua, txawm hais tias qee qhov txuas yuav siv 25 txoj hlua.

· RS485 Protocol

LubRS485 or EIA-485Cov txheej txheem tau txais kev pom zoo dav dav hauv kev teeb tsa kev lag luam. Nws muaj ntau qhov zoo dua li RS232:

1. Topology ntau lub ntsiab lus:

   • RS485tso caintau lub receiver thiab transmitterskom txuas nrog tib lub tsheb npav.
   • Kev xa cov ntaub ntawv sivcov teeb liab sib txawvrau kev sib xws.

2. Hom Kev Ua Haujlwm:

   • RS485cov interfaces nrog2 tus neeg tiv taujua haujlwm hauvhom ib nrab-duplex, tsuas yog xa lossis txais cov ntaub ntawv thaum lub sijhawm twg los tau.
   • RS485cov interfaces nrog4 tus neeg tiv taujtuaj yeem khiav mus rau hauvhom puv-duplex, ua kom muaj kev sib kis thiab kev txais tos tib lub sijhawm.

3. Kev Sib Txuas Lus Deb:

   • RS485ua tau zoo heevkev sib txuas lus deb.
   • Nws zoo tagnrho rau cov ntawv thov uas cov khoom siv tau kis thoob plaws qhov deb tseem ceeb.

4. Cov Qib Voltage:

   • RS485sivkev sib txawv ntawm qhov hluav taws xob, txhim kho kev tiv thaiv suab nrov.

Hauv kev xaus, RS232 yooj yim dua rau kev txuas cov khoom siv hla qhov deb luv luv, thaumRS485tso cai rau ntau lub cuab yeej ntawm tib lub tsheb npav hla qhov deb dua.

Nco ntsoov tias RS232 ports feem ntau yog tus qauv ntawm ntau lub PCs thiab PLCs, thaumRS485tej zaum yuav tsum tau yuav cov chaw nres nkoj sib cais.