Ib qho ntawm cov qauv txheej txheem qub tshaj plaws rau cov kev hloov pauv cov xov xwm digital asynchronous yog RS-232. Nws kev nqis tes ua hauv PC tau ua tiav los ntawm cov khoom siv tshwj xeeb - chaw nres nkoj COM. Txawm hais tias muaj qhov tshiab thiab sai dua kev sib txuas lus, COM chaw nres nkoj tseem siv, tshwj xeeb, thaum modem ua haujlwm. Qee zaum, hauv qhov xwm txheej no, nws yog qhov yuav tsum tau ua kom tau txais ceev nrawm ntawm qhov tau txais thiab xa cov ntaub ntawv kom tsis txhob poob cov ntaub ntawv. Koj tuaj yeem tsim qhov COM qhov chaw nres nkoj kom nrawm rau ob qho programmatically thiab siv cov txheej txheem Windows OS.
Cov Lus Qhia
Kauj ruam 1
Thaum ua haujlwm nrog ib tus qauv hloov pauv, hloov COM chaw nres nkoj kom ceev hauv cov khoom siv parameter chaw. Txhawm rau ua qhov no, hauv "Pib" ntawv qhia zaub mov, xaiv "Control Vaj Huam Sib Luag" thiab qhib "Txoj Kev Siv Xov Tooj thiab Modem". Nyob rau hauv lub qhov rai uas tshwm, hauv "Modems" tab, xaiv cov ntaus ntawv xav tau thiab nyem rau ntawm "Properties" khawm.
Kauj ruam 2
Mus rau "Modem" tab thiab hauv "Modem chaw nres nkoj nrawm" daim ntawv teev nqis, muab cov npav yam xav tau rau qhov chaw nres nkoj COM siv. Qhov ntsuas cua no tsis yog qhov kev taw qhia ntawm qhov siab tshaj plaws ntawm qhov txuas ntawm qhov txuas. Tab sis los ntawm kev hloov pauv tus nqi, koj yuav teeb tsa kev sib txuas ceev, uas lub modem yuav tsis muaj peev xwm dhau thaum txuas nrog.
Kauj ruam 3
Txhawm rau hloov qhov ceev ntawm lwm qhov chaw nres nkoj COM, mus rau "Ntxiv cov kev sib txuas lus" tab. Nyem rau khawm "Ntxiv tsis tseem ceeb" thiab nyob rau hauv lub qhov rai uas tshwm, xaiv hauv "COM chaw nres nkoj tus naj npawb" sau cov cuab yeej uas koj xav tau siv rau kev sib txuas lus siv modem. Thov nco ntsoov tias qhov tshwj xeeb no cuam tshuam tsuas yog tias koj lub cev hloov kho modem cable mus rau txuas ntawm lwm qhov chaw nres nkoj COM.
Kauj ruam 4
Hauv Advanced Advanced Settings tab ntawm dhau los Modem Properties dialog box, nyem lub pob Change Change Default. Lub qhov rai yuav tshwm ntawm qhov screen, mus rau "General" tab, qhov twg muaj cov khoom nrog hu thiab cov ntaub ntawv cov kab sib txuas. Nyob rau hauv "Chaw nres nkoj kom ceev" daim ntawv teev nqis, tsim kom muaj qhov xav tau kev sib txuas lus siab tshaj plaws rau cov ntaub ntawv xa mus los ntawm modem.
