Serial chiteshi chacho kuenderana

Ikozvino kunzwa mashoko okuti "zvengarava pakombiyuta", haufaniri kuenda dzakagadzirirwa muzvitoro, kana kuva muridzi mabikirwo kombiyuta. Pashure pezvose, kunyange vadzidzi puraimari vari ainyatsoziva panyaya iyi.

Nemashoko "chiteshi" murume kazhinji kumiririrwa berth vaine Cranes apo ngarava huru kupinda, achizivisa zvinhu vachizvitakudza nhumbi. In kombiyuta ouinjiniya chiyamuro goho chengarava mumwe akasiyana Hardware inowanikwa zvakagadzirirwa kubatanidza zvemukati uye peripheral mano kuti motherboard bhazi mashoko. Sezvo pakuonekwa rokutanga makombiyuta dzave dzichitaurwa vakawanda zvengarava siyana izvo zvakasiyana zvose Implementation panyama uye dzakati kushandiswa. Vamwe achiripo uye anoshandiswa kunyange nhasi. Somuenzaniso, imwe Serial chiteshi, vazhinji motherboard vagadziri vakanga zvakare unsoldering pamusoro zvigadzirwa zvavo.

Chii zvakadaro kunoshamisa? Asynchronous Serial chiteshi (dzimwe nguva dzinonzi ru, kubva Chirungu. Shoko «Communications») yakabuda rokutanga IBM-enderana zvivezwa kombiyuta. Unoshandiswa kubatanidza mbeva, Modem nezvimwe peripheral Mhiko sangano (zvaida null-Modem wire), nyore rezvebonde kubatana pakati makombiyuta maviri. Mumwe zvazvakanakira vapiwe parutivi Serial chiteshi iri nyore Hardware uye Software Implementation.

Panyama, zvinonzi anomiririrwa 9 kana 25-Pin connector. Data kutapukirwa anotora nzvimbo mauri Zvishoma nezvishoma, successively (sezvineiwo, wechipiri richizonzi). Protocol haritorwi chero nguva miganhu kuti chinguva pakati ose 16 matomu (2 bytes). Nemhaka iyi inoti, ari Serial chiteshi unowanzonzi asynchronous.

Zvinofanira kucherechedzwa kuti ikakuruma mwero ruzivo richiri inodzorwa. Saka, mune mwero Hardware Implementation, yakabvumirwa mwero 115.200 matomu por wechipiri (bps), kunyange yemanyorero Windows kushanda hurongwa zviri artificially chete 9600 (inodzidzisa anogona kuchinja kuti mudziyo maneja). Kusiyana nevamwe Serial interfaces (USB, FireWire) matomu aunganidzwa kupinda omumasherufu, ndokuipfuudza mu migove.

A zvakafanana USB inowanikwa yave chinozoiswa nechinangwa ousting kubva kumusika Kukwegura ru chengarava (RS-232C). danho iri rakanga chisingadzivisiki, sezvo mashoko kutapurirana nokukurumidza rinonyanya zvibereko akasiyana-siyana aiva baud 921.600 chete, kuti akanga asina kukwana (kuenzaniswa USB uye 480 Mb / s). The drawback rechipiri - hazvibviri "inopisa" kubatana: kuedza kubatanidza mudziyo kune Serial chiteshi kana kombiyuta iri vachimhanya kwakaguma yakanakisisa nyaya nekusagona kushanda nokuda kwokushayiwa Plug & Play ano, uye dzimwe akaipisisa - kuti kukundikana zvose mudziyo uye controller ru chengarava riri motherboard (kuwedzera kadhi).

Nokuda kwaizvozvi, makore mashoma apfuura, makadhi ose rakapa havana ru port, sezvo chakaitika PS / 2 uye AGP. Zvisinei, vakawanda zviripo peripherals zvakagadzirirwa kushanda pamwe Serial pachiteshi, kumanikidzwa vagadziri vavezve ru uye kunyange LPT (kufanana). Hapana mubvunzo, vanoshandisa vazhinji akavaudza "mazvita". Pashure kwepfumo nokuti Mwedzi mugamuchiri zvino hapana chikonzero kutsvaka tsaru kombiyuta kana kutenga zvakanaka adapters, inverters. Uyezve, programmers vakawanda vari kushanda kubudikidza Serial chiteshi, sezvo kunyora kuzvidzora mapurogiramu haakonzeri dambudziko yakawanda naye.

Zvinofadza kuti vakawanda nhasi peripherals kushanda nemazvo ari uchishandisa hurongwa emulates munhu ru pachiteshi. Ichi mobile phones, maredhiyo, ari Makaralı adapteri , uye vamwe. Chokwadi, zvechadenga rakapotsa chiteshi kwakakwirira zvikuru kupfuura mureza Implementation.