Yuav ua li cas txheeb xyuas qhov voltage RS232?

Tus qauv RS232 tau pib tsim los ntawm Electronics Industry Alliance (EIA), uas txhais cov yam ntxwv hluav taws xob thiab cov qauv kev sib txuas ntawm lub cev rau kev sib txuas lus ntawm Cov Khoom Siv Hluav Taws Xob (DTE) thiab Cov Khoom Sib Txuas Lus (DCE). Hais txog cov yam ntxwv ntawm hluav taws xob, cov tsoos RS232 interfaces siv cov teeb liab bipolar xws li ± 3 txog ± 15 volts, qhov logic "1" feem ntau yog sawv cev los ntawm qhov tsis zoo voltage thiab logic "0" yog sawv cev los ntawm qhov zoo voltage.
Txhawm rau txheeb xyuas qhov voltage ntawm RS232 interface, cov kauj ruam hauv qab no yuav tsum tau ua:
1. Kev npaj kev nyab xeeb:
Ua ntej pib qhov kev sim, xyuas kom meej tias txhua yam khoom siv txuas nrog RS232 interface tau raug muab tua kom tsis txhob muaj cov khoom puas lossis raug mob ntawm tus kheej.
Xyuas kom meej tias cov cuab yeej kuaj koj siv (xws li multimeter) ua tau raws li qhov yuav tsum tau ntsuas RS232 voltage theem thiab ua haujlwm zoo.
2. Kev tshuaj xyuas lub cev sib txuas:
Xyuas seb qhov kev sib txuas ntawm lub cev ntawm RS232 interface puas ruaj ntseg, suav nrog seb cov pins ntawm DB9 lossis DB25 txuas puas zoo thiab tsis muaj kev puas tsuaj.
Xyuas kom meej tias qhov kev sojntsuam lossis clamp ntawm qhov ntsuas ntsuas tau raug txuas nrog cov pins sib txuas ntawm RS232 interface kom tsis txhob muaj cov ntaub ntawv tsis raug los ntawm kev sib cuag tsis zoo.
3. Static voltage ntsuas:
Thaum siv multimeter los teeb tsa DC qhov ntsuas qhov ntsuas qhov tsim nyog, feem ntau yog qhov ntau tshaj ± 20 volts yuav tsum raug xaiv kom raug.
Ntsuas lub xeev tsis muaj zog ntawm cov teeb liab kab ntawm RS232 interface, uas feem ntau suav nrog TX (xa mus), RX (tau txais), RTS (thov kom xa), thiab CTS (tshwj xeeb xa).
Sau cov nqi hluav taws xob ntawm txhua kab teeb liab thiab sib piv nrog qhov ntsuas hluav taws xob tau teev tseg hauv RS232 tus qauv.
4. Dynamic signal capture:
Hauv cov txheej txheem xa tawm cov ntaub ntawv tiag tiag, kev tshaj lij oscilloscopes lossis cov khoom siv nrog kev txheeb xyuas kev ua haujlwm tau siv los ntes thiab txheeb xyuas cov teeb liab waveforms.
Saib xyuas seb lub teeb liab waveform puas tau raws li qhov xav tau ntawm lub viav vias thiab xyuas seb puas muaj kev cuam tshuam, kev ua haujlwm tsis zoo, lossis lwm yam tshwm sim txawv txav.
5. Kev xeem khiav mus sij hawm ntev:
Khiav lub cuab yeej nyob rau hauv ib txwm ua hauj lwm tej yam kev mob rau ib lub sij hawm ntawm lub sij hawm thiab tsis tu ncua saib xyuas qhov voltage kev ua tau zoo ntawm RS232 interface.
Ua tib zoo saib seb puas muaj voltage drift lossis stability txo tom qab ua haujlwm ntev.
6. Kev txheeb xyuas qhov tshwm sim:
Txiav txim siab seb qhov voltage ntawm RS232 interface yog qhov qub raws li qhov ntsuas tau. Yog tias qhov hluav taws xob pom tau tias nyob sab nraum qhov ib txwm muaj, nws yuav tsum tau kho cov cuab yeej teeb tsa lossis hloov lub cable.
Yog tias qhov ntsuas tau nyob ze ntawm tus nqi ciam teb, xav txog qhov muaj feem cuam tshuam ntawm ib puag ncig (xws li kub thiab av noo) ntawm cov cuab yeej ua haujlwm, thiab ua qhov tsim nyog calibration.
7. Kev daws teeb meem thiab kho:
Yog tias pom muaj teeb meem, xa mus rau phau ntawv qhia kev ntawm lub cuab yeej lossis tiv tauj lub chaw tsim khoom txhawm rau kuaj xyuas thiab kho cov lus qhia ntxiv.
Thaum tsim nyog, hloov cov khoom puas lossis kho cov kab mob puas tsuaj los xyuas kom meej tias tag nrho cov khoom ua tau raws li tus qauv RS232.
Hauv cov ntsiab lus, kev tshuaj xyuas qhov voltage ntawm RS232 interface yog txheej txheem ntau kauj ruam uas xav kom cov neeg ua haujlwm paub txog cov khoom siv hluav taws xob thiab siv tau cov cuab yeej ntsuas kom raug. Los ntawm cov kauj ruam saum toj no, nws tuaj yeem ua kom ntseeg tau tias kev sib txuas lus sib txuas hluav taws xob ntawm RS232 cov cuab yeej ua tau raws li cov qauv, yog li ua kom ntseeg tau cov ntaub ntawv xa mus tau zoo thiab kev ua haujlwm ntawm cov khoom siv. Hauv kev ua haujlwm zoo, nws tseem yuav tsum tau ua tib zoo saib xyuas kev nyab xeeb ntawm tus kheej thiab kev tiv thaiv cov khoom siv kom tsis txhob muaj kev pheej hmoo tsim nyog los ntawm kev ua haujlwm tsis raug. Nrog rau kev txhim kho thev naus laus zis, txawm hais tias cov qauv kev sib txuas lus tshiab tseem tshwm sim, RS232 tseem tuav txoj haujlwm tseem ceeb hauv ntau qhov chaw lag luam. Yog li, kev txawj ntse ntawm kev kuaj xyuas RS232 voltage tseem yog ib feem tseem ceeb ntawm kev saib xyuas haujlwm.