Iyini i-RS-485 interface? Yiziphi izici zayo uma iqhathaniswa ne-RS-232-C interface? Ngenxa yokubukeka kwangaphambi kwesikhathi kwe-RS-232-C ejwayelekile, kunokushiyeka okuthile, ikakhulukazi okuhlanganisa amaphuzu amane alandelayo: (1) Izinga lesiginali le-interface liphezulu, okulula ukulimaza i-chip yesekethe yesixhumi esibonakalayo. , futhi ngenxa yokuthi ayihambisani neleveli ye-TTL, kuyadingeka ukusebenzisa umjikelezo wokuguqulwa kweleveli ukuze uxhumane nesekhethi ye-TTL. (2) Izinga lokudlulisela liphansi. Ngokudluliswa kwe-asynchronous, izinga le-baud ngu-20Kbps. (3) Isixhumi esibonakalayo sisebenzisa ulayini wesignali kanye nolayini wokubuyisa isignali ukuze kwakhiwe ifomu elivamile lokudlulisa umhlaba. Lokhu kudluliswa komhlaba okujwayelekile kuthambekele ekuphazamisekeni kwemodi evamile, ngakho ukumelana nokuphazamiseka komsindo akunamandla. (4) Ibanga lokudlulisela lilinganiselwe. Inani elijwayelekile lebanga eliphezulu lokudlulisa ngamafidi angama-50, kodwa lingasetshenziswa kuphela cishe kumamitha angu-50. Uma kubhekwa ukushiyeka kwe-RS-232-C, kuye kwavela izindinganiso ezintsha zokusebenzelana, futhi i-RS-485 ingenye yazo. Inezici ezilandelayo: 1. Izici zikagesi ze-RS-485: i-logic "1" imelelwa umehluko we-voltage phakathi kwemigqa emibili njenge-+(2-6) V; I-logic "0" imelwe umehluko we-voltage phakathi kwemigqa emibili engu-(2-6) V. Izinga lesignali yesixhumi esibonakalayo liphansi kunalelo lika-RS-232-C, ngakho akulula ukulimaza i-chip yesixhumi esibonakalayo. i-interface circuit, futhi leli zinga lihambisana nezinga le-TTL, elingaxhunywa kalula nesekethe ye-TTL. 2. Izinga eliphezulu lokudluliswa kwedatha lika-RS-485 ngu-10 MB PS3. I-interface ye-RS-485 iyinhlanganisela yomshayeli olinganiselayo nomamukeli ohlukile, okuthuthukisa ikhono lokuphazanyiswa kwemodi ephikisana nokujwayelekile, okungukuthi, ikhono lokuphazanyiswa eliphikisana nomsindo lihle. 4. Inani elijwayelekile lebanga eliphezulu lokudlulisa le-RS-485 lingamafidi angu-4,000, elingafinyelela kumamitha angu-3,000. Ngaphezu kwalokho, isikhombimsebenzisi se-RS-232-C sivunyelwe kuphela ukuxhuma i-transceiver eyodwa ebhasini, okungukuthi, amandla esiteshini esisodwa. I-interface ye-RS-485 ivumela ukuxhumeka kwama-transceivers afika ku-128 ebhasini. Okusho ukuthi, inamandla eziteshi eziningi, ukuze abasebenzisi bakwazi ukusungula kalula inethiwekhi yemishini ngokusebenzisa isikhombimsebenzisi esisodwa se-RS-485. I-RS-485 interface iyisixhumi esibonakalayo esithandwayo ngenxa yokuphazamiseka kwayo okuhle kokulwa nomsindo, ibanga elide lokudlulisela kanye nekhono leziteshi eziningi. Ngenxa yokuthi inethiwekhi eyi-half-duplex eyakhiwe ukuxhumana kwe-RS485 ngokuvamile idinga izintambo ezimbili kuphela, izixhumanisi ze-RS485 zonke zisebenzisa ukudluliswa kwamapheya okusontekile okuvikelekile. I-9-core plug socket ye-DB-9 isetshenziselwa isixhumi esibonakalayo se-RS485, i-DB-9 (imbobo) isetshenziselwa ukusebenzelana netheminali ehlakaniphile engu-RS485, kanye ne-DB-9 (pin) isetshenziselwa isixhumi esibonakalayo sekhibhodi RS485 esixhunywe nekhibhodi.