Qhov laj thawj Yog vim li cas Cov lej scanner tsis tuaj yeem nyeem "nyeem" Txoj Cai Yog Vim Li Cas ...

Bar code scanner yog tam sim no ib qho ntawm cov khoom tsim nyog rau ntau lub lag luam. Thaum qhov bar code tsis tuaj yeem nyeem ib txwm, nws yuav cuam tshuam rau kev ua haujlwm zoo li qub. Yog li dab tsi feem ntau ua rau qhov no? Cia' s qhia qee qhov laj thawj hauv kev nthuav dav.

Thawj qhov laj thawj tias barcode scanner tsis tuaj yeem nyeem cov lej barcode ib txwm: nws yuav yog vim hais tias kev ntsuas barcode tsis qhib. Rau qee qhov tshwj xeeb scanning barcodes, lawv tau muab tua hauv cov chaw tsim khoom. Koj yuav tsum tau tig lub hom barcode sib thooj raws li phau ntawv qhia kom nyeem cov ntaub ntawv barcode txhua zaus.

Qhov thib ob, nws nyuaj rau nyeem cov ntawv barcode yog tias lub teeb ci pom tshwm sim vim lub kaum sab xis ntawm lub hnub ci. Rau lub scanner, thaum tus photoreceptor mus txog rau thaj chaw teeb tsa, cov lus qhia barcode tsis tuaj yeem nyeem ib txwm. Los yog nws tsis yooj yim sua kom luam vim hais tias qhov deb deb scanning yog kev tsis zoo. Tom qab tag nrho, kev ntsuas ntau yam muaj qee yam xav tau.

Tsis tas li ntawd, yog tias barcode nws tus kheej tsis tau ua tiav cov qauv cuam tshuam, piv txwv li, yog tias qhov sib piv ntawm qhov barcode tsis tau siab lossis muaj teeb meem nrog qhov sib piv ntawm qhov dav rau qhov dav, nws yuav cuam tshuam rau kev soj ntsuam barcode. Thiab yog tias qhov luam ntawv tsis meej lossis tsis tiav, nws yuav cuam tshuam nws cov haujlwm luam tawm ib txwm.

Cov no yog cov laj thawj niaj hnub uas cov lej bar code tsis tuaj yeem luam tawm tau zoo. Cov cawv ntawm cov yam tseem ceeb yuav cuam tshuam rau qhov txiaj ntsig ntawm kev ntsuas scan. Txhawm rau zam cov xwm txheej no ntau li ntau tau, kev ua haujlwm luam ntawv tuaj yeem hloov kho.