Kuthetsa Mpata: Chidziwitso Chofunikira cha PLC Kuyankhulana kwachinsinsi kwa Akatswiri a Zamagetsi
Kuthetsa Mpata: Chidziwitso Chofunikira cha PLC Kuyankhulana kwachinsinsi kwa Akatswiri a Zamagetsi
Zinsinsi za Kulumikizana kwa Serial
Kuyankhulana kwa seri ndi njira yodziwika bwino yapachipangizo - to - device data exchange. Mosiyana ndi USB, makompyuta ambiri ali ndi madoko awiri a RS232 - okhazikika. Madoko a seri amagwiritsidwanso ntchito kwambiri pazida ndi zida zakutali - zida zopezera.
Ma Parameters Ofunikira a Kulumikizana kwa Seri
Kuti kulumikizana kwa serial kwabwino, magawo otsatirawa agwirizane ndi madoko:
Baud Rate: Imayezera deta - liwiro lotumizira mu bits pa sekondi iliyonse. Mwachitsanzo, 300 baud ikufanana ndi 300 bits pa sekondi iliyonse. Mlingo wa Baud umakhudza mwachindunji mafupipafupi a sampuli pa mzere wa data. Kuchulukirachulukira kwa baud, komwe kumathandizira kulumikizana kwakanthawi kochepa, kothamanga kwambiri, kumayenderana mosagwirizana ndi mtunda wotumizira.
Ma Data Bits:Imayimirirani deta yeniyeni mu kutumiza. Miyezo yokhazikika ndi 5, 7, kapena 8 bits. Mwachitsanzo, muyezo wa ASCII umagwiritsa ntchito 7 bits, pamene ASCII yowonjezera imagwiritsa ntchito 8. Kusankha kumadalira deta yeniyeni - zofunikira zotumizira.
Imitsani Bits:Chongani kumapeto kwa paketi ya data, nthawi zambiri imakhala ndi 1, 1.5, kapena 2 bits. Amathandizira zida kulumikiza mawotchi panthawi yolumikizana. Zoyimitsa zochulukira zimakulitsa kulolerana kwa wotchi - kusiyana kwa nthawi koma kuchepetsa kuchuluka kwa data - kufalikira.
Parity Bit:Cholakwika chophweka - kufufuza njira. Zosankha zikuphatikizapo ngakhale, osamvetseka, apamwamba, otsika, kapena ayi. Parity yofanana ndi yosamvetseka imayika pang'onopang'ono kuti muwonetsetse kuchuluka kapena kusamvetseka kwa ma bits omveka bwino mu data yotumizidwa. Kugwirizana kwakukulu ndi kutsika kumangoyika pang'ono pang'onopang'ono kapena kutsika, kulola zipangizo zolandirira kuti zizindikire kusokonezeka kwa kulankhulana kapena kusagwirizana.
Common PLC Interfaces
Mtengo wa RS-232:Muyezo wa RS - 232 ndiwofala pa IBM - PC ndi machitidwe ogwirizana. Imathandizira ntchito zosiyanasiyana monga kulumikiza mbewa, osindikiza, ma modemu, ndi zida zamakampani. Ngakhale RS - 232 imathandizira kulumikizana pakati pa madoko a PC ndi zida, mtunda wake wopitilira ndi 50 mapazi.
Mtengo wa RS-422:RS - 422, yogwiritsidwa ntchito m'makompyuta a Apple Macintosh, imagwiritsa ntchito zizindikiro zosiyana. Mosiyana ndi RS - 232's single - yomaliza - siginecha yotchulidwa, RS - 422's different transmission imagwiritsa ntchito mizere iwiri potumiza ndi kulandira ma sign. Izi zimakulitsa chitetezo chamkokomo ndikukulitsa mtunda wotumizira, ndikupangitsa kukhala koyenera kumafakitale.
Mtengo wa 485RS - 485 imayenda bwino pa RS - 422 pothandizira zida za 32 ndikutanthauzira mawonekedwe amagetsi pamlingo wapamwamba - chipangizo - kuwerengera zochitika kuti zitsimikizire voteji yokwanira yamagetsi. Zimalola kupanga maukonde a chipangizo pogwiritsa ntchito doko limodzi la RS - 422. Ndi phokoso lamphamvu - chitetezo chokwanira komanso chithandizo chazida zambiri, RS - 485 ndiyabwino pazogwiritsa ntchito zamafakitale monga ma netiweki amagetsi olumikizidwa ndi ma PC, owongolera zosonkhanitsira deta, ma HMI, ndi machitidwe ena ogwirira ntchito. RS - 485 ndi superset ya RS - 422, imathandizira kuwongolera zida zonse za RS - 422 zokhala ndi mtunda wopitilira 4,000 mapazi.