Video: Kuv yuav ua li cas thiaj paub yog tias kuv lub serial cable yog null modem?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Qhia rau koj paub NI serial cable yog null modem los yog ncaj txawm tias , nrhiav nws tus lej hauv NI Serial Hardware Specifications thiab Features thiab ceeb toom kab ntaus hauv tus piav qhia. Xwb, koj tuaj yeem siv lub handheld DMM los ntsuas kev txuas mus ntxiv tus tus kheej pins ntawm koj serial cable.
Ntawm no, puas yog null modem cable zoo ib yam li serial cable?
Null modem cables yog serial kab uas siv lwm pinout rau txawv functionality. Keeb kwm, tag nrho serial kab ua AT kab thiab tsis tuaj yeem txuas ob lub cuab yeej (xws li ob lub khoos phis tawj) ncaj qha. Lawv xav tau ib modem los yog cov cuab yeej zoo sib xws li kev mus-nruab nrab.
Tsis tas li ntawd, dab tsi yog serial crossover cable? A null modem serial cable (feem ntau hu ua a crossover kab ) yog siv los txuas ob qho khoom siv DTE ua ke yam tsis tas siv lub cuab yeej DCE nyob nruab nrab. Rau qhov no tshwm sim, Transmit (TXD) thiab Txais (RXD) pins ntawm ib qho ntawm cov xwm txheej connectors yog flipped.
Tom qab ntawd, dab tsi yog null modem rs232 cable?
Null modem yog ib txoj kev sib txuas lus ncaj qha mus txuas ob DTEs (lub computer, davhlau ya nyob twg, tshuab luam ntawv, thiab lwm yam) siv ib qho Qauv: RS-232 xwm txheej kab . Nrog ib null modem kev sib txuas cov kis thiab txais kab yog crosslinked. Nyob ntawm lub hom phiaj, qee zaum kuj muaj ib lossis ntau txoj kab sib tuav tes sib txuas.
Dab tsi yog serial modem?
Serial Chaw nres nkoj thiab Modem Cables. Txhawm rau txuas lub khoos phis tawj, lub davhlau ya nyob twg, lossis lwm yam khoom siv Terminal (DTE) rau a modem lossis lwm yam khoom siv sib txuas lus (DCE). Txhawm rau txuas ib qho DTE ncaj qha mus rau lwm tus, piv txwv li PC rau lwm lub computer lossis rau qee yam khoom siv.
Pom zoo:
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