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

Serial kev sib txuas lus raws tu qauv ua lub luag haujlwm tseem ceeb hauv kev sib txuas cov khoom siv thiab ua kom muaj kev sib pauv ntaub ntawv. Ob tug qauv siv dav yogTSI RS232thiabRS485 ua. Cia peb delve rau hauv lawv cov kev sib txawv.

· TSI RS232raws tu qauv

CovTSI RS232interface (tseem hu ua TIA / EIA-232) yog tsim los tswj kev sib txuas lus sib txuas. Nws pab txhawb cov ntaub ntawv ntws ntawm Cov Khoom Siv Hauv Cov Ntaub Ntawv (DTE), xws li cov khoom siv hluav taws xob lossis cov khoom xa tawm, thiab Cov Khoom Siv Sib Txuas Lus (DCE). Nov yog qee cov ntsiab lus tseem ceeb txog RS232:

1. Hom kev ua haujlwm:

   • TSI RS232txhawb ob leegpuv duplexthiabib nrab duplexhom.
   • Hauv hom puv-duplex, cov ntaub ntawv tuaj yeem xa thiab tau txais ib txhij siv cov xov hlau sib cais rau kev sib kis thiab txais tos.
   • Nyob rau hauv ib nrab-duplex hom, ib kab ib leeg pab ob qho tib si kis tau tus mob thiab tau txais kev khiav dej num, tso cai rau ib tug ntawm ib lub sij hawm.

2. Kev sib txuas lus nrug:

   • RS232 yog haum rauluv luvvim muaj kev txwv hauv lub teeb liab zog.
   • Kev ncua ntev yuav ua rau cov teeb liab degradation.

3. Voltage theem:

   • RS232 sivqhov zoo thiab tsis zoo voltage theemrau kev taw qhia.

4. Tus naj npawb ntawm kev sib cuag:

   • Ib qho RS232 cable feem ntau muaj9 cev, txawm hais tias qee qhov txuas yuav siv 25 xov hlau.

· RS485 raws tu qauv

CovRS485 ua or EIA-485raws tu qauv yog dav saws nyob rau hauv industrial chaw. Nws muaj ntau qhov zoo dua RS232:

1. Multi-Point Topology:

   • RS485 uatso caintau receivers thiab transmittersmus txuas rau tib lub npav.
   • Cov ntaub ntawv xa mus ua haujlwmcov cim qhia txawvrau qhov sib xws.

2. Hom kev ua haujlwm:

   • RS485 uainterfaces nrog2 kev sib cuagua haujlwm hauvib nrab-duplex hom, tsuas yog xa lossis tau txais cov ntaub ntawv ntawm lub sijhawm.
   • RS485 uainterfaces nrog4 kev sib cuagtuaj yeem khiav hauvfull-duplex hom, enabling ib txhij kis tau tus mob thiab txais tos.

3. Kev sib txuas lus nrug:

   • RS485 uaexcels hauvkev sib txuas lus mus ntev.
   • Nws yog qhov zoo tagnrho rau cov ntawv thov uas cov khoom siv kis tau thoob plaws qhov deb.

4. Voltage theem:

   • RS485 uasivDifferential voltage signaling, txhim kho suab nrov tiv thaiv.

Hauv cov ntsiab lus, RS232 yog qhov yooj yim dua rau kev sib txuas cov khoom siv luv luv, thaumRS485 uatso cai rau ntau yam khoom siv ntawm tib lub npav hla ntau dua.

Nco ntsoov tias RS232 cov chaw nres nkoj feem ntau yog tus qauv ntawm ntau lub PCs thiab PLCs, whereasRS485 uacov chaw nres nkoj yuav tsum tau yuav nyias.