Serial tashar jiragen ruwa da kuma ta munasaba

Yanzu su ji magana "tashoshin jiragen ruwa a kwamfuta", ba ka bukatar zuwa sana'a Stores, ko zama mai shi daga cikin kwamfuta fasaha. Bayan duk, ko da firamare ƴan ake masani a wannan al'amari.

A kalmomi "tashar jiragen ruwa" wani mutum ne yawanci wakilta masauki tare da high cranes inda babban jirgin ruwa shigar, haihuwa kayayyakin da loading kaya. A kwamfuta injiniya shigar da fitarwa tashar jiragen ruwa ne daya daga cikin iri na hardware dubawa tsara don haɗa ciki da kuma na gefe na'urorin zuwa motherboard bas data. Tun bayyanar da farko kwakwalwa da aka samarwa a manyan yawan daban-daban mashigai abin da ya bambanta duka biyu jiki aiwatar da yarjejeniya amfani. Wasu sun tsira da ake amfani da ko da a yau. Alal misali, a serial tashar jiragen ruwa, da yawa motherboard masana'antun aka sake unsoldering a kan su kayayyakin.

Abin da yake haka ƙwarai? Asynchronous serial tashar jiragen ruwa (wani lokacin kira COM, daga Turanci. Word «Communications») ya bayyana a farko IBM-jituwa kwamfuta model. Amfani to connect mice, modem da kuma sauran gefe na'urorin, da kuma kungiyar (bukata null-modem na USB), sauki hanyar sadarwa tsakanin biyu kwakwalwa. Daya daga cikin abũbuwan amfãni mallaki by serial tashar jiragen ruwa da ke a cikin sauki daga cikin hardware da software aiwatar.

Jiki, shi ne wakilta 9 ko 25-fil haši. Watsa bayanai faruwa a shi bit ta bit, jẽre (ba zato ba tsammani, na biyu, don haka sunan). Layinhantsaki ne ba batun kowane lokaci da iyaka da tazara tsakanin kowane 16 ragowa (2 bytes). Godiya ga wannan alama, da serial tashar jiragen ruwa ne, wani lokacin kira asynchronous.

Ya kamata a lura da cewa bit kudi bayanai da aka har yanzu kayyade. Saboda haka, a cikin wani misali hardware aiwatar, da yarda kudi 115.200 ragowa da biyu (bps), ko da yake yawanci Windows tsarukan shi ne artificially iyakance zuwa 9600 (mai amfani zai iya sa sabawa da na'urar sarrafa). Ba kamar sauran serial musaya (USB, FireWire) ragowa aka tattara a cikin fakitoci, da kuma daukar kwayar cutar a cikin rabo.

A na kowa USB dubawa da aka aiwatar da manufar ousting daga kasuwa na tsufa COM tashar jiragen ruwa (RS-232C). Wannan mataki da aka makawa, tun da canja wurin bayanai gudun a cikin mafi m iri da aka sani kawai 921.600 baud, cewa ya ba da isasshen (idan aka kwatanta da USB da kuma 480 Mb / s). Na biyu drawback - ba shi yiwuwa a "zafi" dangane: wani yunkurin connect da na'urar da serial tashar jiragen ruwa a lokacin da kwamfuta da aka gudu sa a cikin mafi kyau idan da rashin aiki saboda rashin Toshe & Play fasaha, kuma a mafi mũnin - to da gazawar na biyu da na'urar da mai kula cOM tashar jiragen ruwa a kan motherboard (fadada katin).

Saboda wannan, a 'yan shekaru da suka wuce, duk bayar da katunan ba su da COM tashar jiragen ruwa, kamar yadda ya faru da PS / 2, kuma AGP. Duk da haka, babban adadin data kasance peripherals tsara don aiki tare da serial tashar jiragen ruwa, tilasta masana'antun sake samu da COM kuma ko da LPT (a layi daya). Babu shakka, da yawa masu amfani sun gaya musu "na gode". Bayan walƙiya ga wani tauraron dan adam mai karɓar yanzu babu bukatar duba ga wani tsohon kwamfuta ko saya m adaftan, inverters. Bugu da ƙari kuma, mafi shirye-shirye da ake ma aiki ta hanyar da serial tashar jiragen ruwa, kamar yadda da rubutu iko da shirye-shirye ba sa da yawa wahalar da shi.

Yana da ban sha'awa cewa da yawa daga yau peripherals domin yin aiki daidai a cikin tsarin aiki emulates a COM tashar jiragen ruwa. Wannan mobile phones, gidajen radiyo kan ware, da Bluetooth adaftan , da sauransu. Hakika, da halaye na mai rumfa tashar jiragen ruwa ne mafi girma fiye da misali aiwatar.