Menene RS-485 dubawa? Menene halayensa idan aka kwatanta da RS-232-C dubawa? Saboda farkon bayyanar mizanin RS-232-C, babu makawa akwai wasu kurakurai, galibi sun haɗa da maki huɗu masu zuwa: (1) Matsayin siginar na'urar yana da girma, wanda ke da sauƙin lalata guntu na da'ira mai dubawa. , kuma saboda bai dace da matakin TTL ba, wajibi ne a yi amfani da da'irar jujjuya matakin don haɗawa da da'irar TTL. (2) Yawan watsawa yana da ƙasa. A cikin watsawa asynchronous, ƙimar baud shine 20Kbps. (3) Ma'auni yana amfani da layin sigina da layin dawo da sigina don samar da nau'in watsawa na gama gari. Wannan watsawar ƙasa gama gari yana da saurin tsangwama ga yanayin gama gari, don haka juriyar kutsewar amo ba ta da ƙarfi. (4) Nisan watsawa yana iyakance. Madaidaicin ƙimar matsakaicin nisan watsawa shine ƙafa 50, amma ana iya amfani dashi a kusan mita 50 kawai. Bisa la'akari da gazawar RS-232-C, wasu sabbin ka'idoji sun fito, kuma RS-485 na ɗaya daga cikinsu. Yana da halaye masu zuwa: 1. Halayen lantarki na RS-485: ma'anar "1" tana wakiltar bambancin ƙarfin lantarki tsakanin layi biyu kamar + (2-6) V; Ma'anar "0" tana wakilta ta bambancin ƙarfin lantarki tsakanin layin biyu kasancewa- (2-6) V. Matsayin siginar mu'amala ya yi ƙasa da na RS-232-C, don haka ba shi da sauƙi a lalata guntu na da'irar dubawa, kuma wannan matakin ya dace da matakin TTL, wanda za'a iya haɗa shi cikin sauƙi tare da da'irar TTL. 2. Mafi girman adadin watsa bayanai na RS-485 shine 10 MB PS3. Ma'anar RS-485 shine haɗuwa da daidaitaccen direba da mai karɓa daban-daban, wanda ke haɓaka ƙarfin tsoma baki na yanayin gama gari, wato, ƙarfin tsoma baki yana da kyau. 4. Madaidaicin ƙimar matsakaicin nisan watsawa na RS-485 dubawa shine ƙafa 4,000, wanda a zahiri zai iya kaiwa mita 3,000. Bugu da kari, RS-232-C interface ana ba da izini kawai don haɗa transceiver ɗaya akan bas, wato ƙarfin tasha ɗaya. Tsarin RS-485 yana ba da damar haɗin kai har zuwa 128 transceivers akan bas. Wato tana da ikon tashar tashoshi da yawa, ta yadda masu amfani za su iya kafa hanyar sadarwar kayan aiki cikin sauƙi ta hanyar amfani da RS-485 guda ɗaya. RS-485 dubawa shine mafi kyawun ƙirar siriyal ɗin da aka fi so saboda tsangwama mai kyau na hana surutu, nisan watsawa mai tsayi da iyawar tashoshi da yawa. Saboda cibiyar sadarwar rabin-duplex da ta ƙunshi musaya na RS485 gabaɗaya tana buƙatar wayoyi biyu kawai, RS485 musaya duk sun ɗauki garkuwar ruɗaɗɗen watsawa biyu. Ana amfani da soket ɗin filogi na 9-core na DB-9 don haɗin haɗin haɗin RS485, DB-9 (rami) ana amfani da shi don dubawa tare da tashar RS485 mai hankali, kuma DB-9 (pin) ana amfani da shi don ƙirar maɓalli na RS485 da aka haɗa da madannai.