[AIPU-WATON] Kodi Pali Kusiyana Kotani Pakati pa RS232 ndi RS485?

Ma serial communication protocols amatenga gawo lofunikira pakulumikiza zida ndikupangitsa kusinthana kwa data. Miyezo iwiri yomwe imagwiritsidwa ntchito kwambiri ndiMtengo wa RS232ndiMtengo wa RS485. Tiyeni tifufuze kusiyanitsa kwawo.

· Mtengo wa RS232Ndondomeko

TheMtengo wa RS232mawonekedwe (omwe amadziwikanso kuti TIA/EIA-232) adapangidwa kuti aziwongolera kulumikizana kwakanthawi. Imathandizira kuyenda kwa data pakati pa Data Terminal Equipment (DTE), monga ma terminals kapena transmitters, ndi Data Communications Equipment (DCE). Nazi mfundo zazikulu za RS232:

1. Kagwiritsidwe ntchito:

   • Mtengo wa RS232imathandizira onse awirifull-duplexnditheka-duplexmodes.
   • Mu mawonekedwe a duplex athunthu, deta imatha kutumizidwa ndikulandilidwa nthawi imodzi pogwiritsa ntchito mawaya osiyana kuti atumize ndikulandila.
   • Munjira ya theka-duplex, mzere umodzi umagwira ntchito zotumizira ndi kulandira, kulola imodzi panthawi imodzi.

2. Kutalikirana:

   • RS232 ndiyoyeneramtunda waufupichifukwa cha kuchepa kwa mphamvu ya chizindikiro.
   • Maulendo ataliatali angapangitse kuti ma sign awonongeke.

3. Miyezo ya Voltage:

   • RS232 ntchitozabwino ndi zoipa voteji mlingoza signature.

4. Nambala ya Olumikizana nawo:

   • Chingwe cha RS232 chimakhala ndi9 waya, ngakhale zolumikizira zina zitha kugwiritsa ntchito mawaya 25.

RS485 Protocol

TheMtengo wa RS485 or EIA-485protocol imatengedwa kwambiri m'mafakitale. Imakhala ndi maubwino angapo kuposa RS232:

1. Multi-Point Topology:

   • Mtengo wa RS485amalolaolandila angapo ndi ma transmitterskulumikizidwa pa basi yomweyo.
   • Kutumiza kwa data kumagwira ntchitozizindikiro zosiyanakwa kusasinthasintha.

2. Kagwiritsidwe ntchito:

   • Mtengo wa RS485zolumikizana ndi2 kulumikizanantchito mutheka-duplex mode, kutumiza kapena kulandira deta yokha panthawi yake.
   • Mtengo wa RS485zolumikizana ndi4 kulumikizanaakhoza kuthamanga mkatiFull-duplex mode, kupangitsa kufalikira ndi kulandira munthawi imodzi.

3. Kutalikirana:

   • Mtengo wa RS485amapambana mukulankhulana mtunda wautali.
   • Ndi yabwino kwa mapulogalamu omwe zipangizo zimafalikira pamtunda waukulu.

4. Miyezo ya Voltage:

   • Mtengo wa RS485amagwiritsakusiyana kwa magetsi, kumawonjezera chitetezo chokwanira cha phokoso.

Mwachidule, RS232 ndiyosavuta kulumikiza zida pamtunda waufupi, pomweMtengo wa RS485imalola zida zingapo m'basi imodzi pa mtunda wautali.

Kumbukirani kuti madoko a RS232 nthawi zambiri amakhala okhazikika pama PC ambiri ndi ma PLC, pomweMtengo wa RS485madoko angafunikire kugulidwa padera.