Uthotho Port vs VGA: Yintoni umahluko?

IiNgcaciso zobuGcisa: Uthotho lwezibuko vs. VGA

Ukuqonda iinkcukacha zobugcisa kuzo zombini izibuko ze-serial kunye ne-VGA izibuko zibonelela ngokuqonda ukufaneleka kwazo kwimisebenzi ethile, ngakumbi kwiindawo ezifuna ukuhanjiswa kwedatha okanye ukukhutshwa kwevidiyo. Eli candelo liphonononga imiba yobugcisa ephambili, kubandakanywa izinga ledatha, uluhlu lwemiqondiso, isisombululo, kunye nemigangatho eqhelekileyo.

A. Ireyithi yedatha kunye nobubanzi bomthamo

Uthotho lwezibuko:

Ireyithi yedatha:Amazibuko othotho asebenza ngesantya esisezantsi, kunye namazinga aphezulu edatha ukuya kuthi ga kwi-115.2 kbps. Esi santya sisezantsi siyenza ilungele ukugqithiselwa kwedatha ye-bit-by-bit apho i-high-speed throughput ayiyomfuneko.

Ububanzi:Iimfuno ze-bandwidth ye-serial port zincinci, njengoko iprotocol isekela unxibelelwano olulula lwe-point-to-point.

Ukufaneleka kwesicelo:Ngenxa yomlinganiselo wedatha elinganiselweyo, i-serial port ilungile kwizicelo zemizi-mveliso apho imfezeko yedatha ngaphezu kwesantya ibalulekile, njengokudibanisa izixhobo zelifa, iimodem, kunye neentlobo ezithile zoluvo.

Izibuko leVGA:

Ireyithi yedatha:Izibuko zeVGA azidluliseli idatha ngendlela efanayo namazibuko othotho. Endaweni yoko, bahambisa imiqondiso yevidiyo ye-analog ngamaxabiso axhasa izisombululo ezahlukeneyo kunye namaxabiso okuhlaziya. I-bandwidth ye-VGA imiselwa sisisombululo sevidiyo; umzekelo, i-640x480 (umgangatho we-VGA) ifuna i-bandwidth ephantsi kune-1920x1080.

Ubungakanani bemfuno:I-VGA ifuna i-bandwidth engaphezulu kune-serial port, ngakumbi kwizisombululo eziphezulu apho ubunzulu bombala obuphezulu kunye nezinga lokuhlaziya kubalulekile.

Ukufaneleka kwesicelo:Izibuko zeVGA zilungile ekuboniseni umxholo wevidiyo kwiimonitha kunye neeprojektha, ngakumbi kwisethingi yemveliso yevidiyo yelifa.

B. Uluhlu lweSignali kunye noBubude beCable

Uthotho lwezibuko:

Obona Bude Bobude beCable:Imigangatho ye-RS232 yamazibuko e-serial ixhasa ubude bentambo yobude obumalunga ne-15 yeemitha phantsi kweemeko ezifanelekileyo. Ukuthotywa komqondiso kunokwenzeka kwimigama emide, ngoko ke iqhele ukusetyenziselwa imidibaniso emifutshane ukuya phakathi komgama.

Ukuxhathisa ingxolo:Ngenxa yoluhlu olubanzi lwamandla ombane (ukusuka -3V ukuya -15V ngengqiqo "1" kunye + 3V ukuya + 15V ngengqiqo "0"), i-port ye-serial inokuchasana okufanelekileyo kwingxolo, eyenza ifaneleke kwiindawo zoshishino apho ukuphazamiseka kombane kuqhelekileyo.

Izibuko leVGA:

Obona Bude Bobude beCable:Iintambo ze-VGA zisebenza kakuhle ukuya kuthi ga kwi-5-10 yeemitha ngaphandle kokuthotywa komqondiso obonakalayo. Ngaphaya kolu luhlu, umgangatho wophawu lwe-analog unokuwohloka, okukhokelela kwimifanekiso engacacanga kunye nokuncipha kokucaca okubonakalayo.

Umgangatho woMqondiso:Isiginali ye-analog ye-VGA isesichengeni ngakumbi sokuphazamiseka kwimigama emide xa kuthelekiswa neempawu zedijithali, ezinokuchaphazela umgangatho womfanekiso kwiziboniso ukuba ubude bentambo bungaphezulu kwemida efanelekileyo.

C. Isisombululo kunye noMgangatho woMfanekiso

Uthotho lwezibuko:

Isigqibo:Ekubeni i-port ye-serial isetyenziselwa ukudluliselwa kwedatha, ayinayo inkcazo yesisombululo. Isasaza idatha yokubini (amasuntswana) ngaphandle kwecandelo elibonakalayo okanye lomzobo.

Umgangatho Womfanekiso:Ayisebenzi kwizibuko ze-serial, njengoko umsebenzi wabo ophambili kutshintshiselwano lwedatha kunemveliso yevidiyo.

Izibuko leVGA:

Inkxaso yesiGqibo:I-VGA ixhasa uluhlu lwezigqibo ngokuxhomekeke kwisibonisi kunye nomthombo wevidiyo. Isisombululo esisemgangathweni seVGA yi-640x480 pixels, kodwa amazibuko amaninzi eVGA anokuxhasa ukuya kuthi ga kwi-1920x1080 okanye ngaphezulu kwiimonitha ezihambelanayo.

Umgangatho Womfanekiso:Ukuba ngumqondiso we-analog, umgangatho womfanekiso weVGA uxhomekeke kwizinto ezifana nomgangatho wentambo, ubude, kunye nokuphazamiseka komqondiso. Ngaphezulu kweentambo ezinde, iisignali zeVGA zinokuphulukana nokubukhali, okukhokelela kwimbonakalo emfiliba.

D. Imigangatho eqhelekileyo kunye neeProtocol

Uthotho lweMigangatho yesiZibu:

Umgangatho we-RS232 ngowona mthetho uxhaphakileyo wamazibuko e-serial, echaza iinkcukacha kumanqanaba ombane, amaxabiso e-baud, kunye noqwalaselo lwephini.

Eminye imigangatho efana ne-RS485 kunye ne-RS422 nayo ikhona kodwa isetyenziselwa izicelo ezifuna ukubonakaliswa kweempawu kunye nenkxaso yomgama omde okanye izixhobo ezininzi.

Imigangatho yeVGA:

I-VGA (i-Video Graphics Array): Umgangatho wokuqala, oxhasa isisombululo se-640x480 kwireyithi yokuhlaziya ye-60 Hz.

I-VGA eyandisiweyo (i-XGA, i-SVGA): Ulungelelwaniso lwakamva luxhasa izisombululo eziphezulu kunye nobunzulu bombala obongezelelweyo, okuvumela i-VGA ukuba ibonise ukuya kuthi ga kwisisombululo se-1080p kwezinye iimonitha.