Serial vs Parallel Port
Ib qhov chaw nres nkoj (los ntawm lo lus Latin "porta" rau lub qhov rooj) yog lub cev sib txuas uas txuas lub khoos phis tawj mus rau lwm lub khoos phis tawj lossis kho vajtse nkag / tawm khoom. Raws li cov teeb liab hloov mus, cov chaw nres nkoj tau muab faib ua ob pawg raws li cov chaw nres nkoj sib txuas thiab cov chaw sib txuas. Serial ports hloov cov ntaub ntawv ib me ntsis ntawm ib lub sij hawm siv ib tug khub ntawm cov xov hlau, thaum uas tig mus ports hloov ntau yam khoom nyob rau hauv ib lub sij hawm siv ib pawg ntawm cov xov hlau.
Serial chaw nres nkoj yog dab tsi?
Serial chaw nres nkoj yog lub cev sib txuas siv rau kev sib txuas lus sib txuas. Cov ntaub ntawv yog pauv ib me ntsis ntawm ib lub sij hawm los ntawm serial ports. Muaj cov thev naus laus zis tshiab xws li Ethernet, FireWire thiab USB uas hloov cov ntaub ntawv serially, tab sis tus qauv RS-232 qub tseem raug txheeb xyuas tias yog "serial chaw nres nkoj". RS-232 yog npaj los siv nrog kev cuam tshuam ntawm lub modem lossis ib yam khoom zoo sib xws. Txawm li cas los xij, cov khoos phis tawj niaj hnub no tuaj yeem tsis muaj RS-232 chaw nres nkoj thiab cov neeg siv yuav tau siv cov converters tsim nyog (xws li serial-rau-USB). Tab sis cov chaw nres nkoj serial tseem siv dav rau cov ntawv thov xws li automation systems hauv kev lag luam, cov cuab yeej ntsuas kev tshawb fawb, cov khoos phis tawj server (xws li tswj consoles) thiab cov khoom siv hauv network (xws li routers). Lub ntsiab yog vim li cas serial ports tseem siv rau saum toj no daim ntaub ntawv yog hais tias lawv yog comparatively yooj yim thiab pheej yig dua. Tsis tas li ntawd, cov lus hais saum toj no yog tus qauv thiab siv dav. Lwm qhov laj thawj yog tias kev txhawb nqa software tsawg heev los ntawm lub kaw lus yog xav tau rau cov chaw nres nkoj serial.
Parallel Port yog dab tsi?
Ib qhov chaw sib txuas yog lub cev sib txuas uas siv rau kev sib txuas ntawm ntau yam khoom siv peripheral rau lub computer. Nws yog keeb kwm lub npe hu ua lub tshuab luam ntawv chaw nres nkoj, vim hais tias thawj qhov chaw nres nkoj thaum uas tig mus tau qhia los ntawm Robert Howard thiab Prentice Robinson nrog Cenetronics Model 101 tshuab luam ntawv hauv 1970. Raws li lub npe qhia, cov chaw nres nkoj no hloov cov ntaub ntawv nyob rau hauv parallel (bidirectional tib lub sijhawm) thiab cov txheej txheem sib thooj tau txhais hauv IEEE 1284 tus qauv. Tab sis cov chaw nres nkoj sib txuas tau siv nrog ntau cov khoom siv peripheral (tsis yog cov tshuab luam ntawv xwb). Qee qhov piv txwv yog Zip drives, scanners, sab nraud modems, audio cards, webcams, joysticks, portable hard disks thiab CD-ROMs. Tab sis tom qab kev taw qhia ntawm USB thiab Ethernet, kev siv ntawm qhov chaw nres nkoj sib txuas tau txo qis. Qhov tseeb, niaj hnub khoos phis tawj qee zaum tsis suav nrog qhov chaw sib txuas thaum nws tau lees paub tias yog qhov chaw nres nkoj qub txeeg qub teg los ntawm ntau lub tuam txhab. Tseem, parallel-to-USB converters yog siv los ua cov qauv qub ntawm cov tshuab luam ntawv.
Qhov txawv ntawm Serial thiab Parallel Port yog dab tsi?
Qhov sib txawv tseem ceeb ntawm cov chaw nres nkoj sib txuas thiab cov chaw sib txuas (tau kawg) yog qhov tseeb tias cov chaw nres nkoj serial xa thiab tau txais cov ntaub ntawv ib ntsis ntawm ib lub sij hawm siv ib khub ntawm cov xov hlau, thaum cov chaw nres nkoj sib txuas xa thiab tau txais cov ntaub ntawv ntau yam ntawm ib qho. lub sijhawm siv ntau cov xov hlau. Vim li no, cov chaw nres nkoj sib txuas tau nrawm dua li cov chaw nres nkoj serial. Nws yooj yim dua los sau cov kev pab cuam rau cov chaw nres nkoj sib txuas piv rau cov chaw nres nkoj serial. Tab sis cov chaw nres nkoj sib txuas xav tau ntau kab los hloov cov ntaub ntawv. Yog li cov chaw nres tsheb sib txuas tsis haum rau kev sib txuas lus ntev vim yog tus nqi siab thiab cov ntaub ntawv poob.
