USB rau RS232 interface kab daim duab

Tsim USB rau RS232 serial port chaw nres nkoj sib txuas qhov teeb meem Qhov cuab yeej kho vajtse muaj plaub pawg
Hauv: USB interface, CH341T, MAX232 thiab RS232 interface. Ntawm lawv, USB interface rau txuas USB host, hauv no xaiv USB tsheb interface hom A connector; CH341T USB interface rau RS232 interface rau tag nrho cov cuab yeej kho mob; MAX232 rau RS232 thiab hloov TLL / CMOS; RS232 interface rau kev siv cov twj RS232. Raws li qhov xav tau tiag tiag, xaiv qhov siv tam sim no siv DB9 connector.

Lub tsheb npav USB muaj xws li ib kab ntawm 5V cov xaim hluav taws xob thiab ib kab ntawv cov kab lus. Nquag, lub 5V zog qaum yog
Liab; av hlau yog dub; D + lub teeb liab yog ntsuab; D-teeb liab kab yog dawb. USB tag nrho
Kab los muab qhov siab tshaj plaws tam sim no tuaj yeem ncav cuag 500 mA, CH341T nti siv tau ncaj qha
USB npav muab 5V fais fab mov. C3 thiab C4 yog cov khoom siv hluav taws xob loj heev, C3 peev feem ntau
4700pF ~ 0.02μF, rau CH341T fais fab mov khoom ntawm decoupling; C4 peev txheej ntawm 0.1
ΜF yog siv rau decoupling ntawm lwm fais fab mov. Crystal X1, Capacitors C1 thiab C2 siv rau moos oscillation
kev. X1 zaus yog 12 MHz, C1 thiab C2 yog lub peev xwm ntawm 15 ~ 30 pF high-zaus ceramic capacitors

Lub
Kev ntsuas kev sib tw

Ib lub computer uas txuas rau daim npav USB-RS232 yuav tsum muaj ib tus neeg tsav tsheb CH341
CH341SER.EXE, thaum lub module thawj zaug txuas rau lub computer USB chaw nres nkoj, lub computer xav nrhiav cov cuab yeej tshiab, ua raws li cov lus cog tseg kom tiav tus tsav tsheb. Tom qab kev txhim kho tus tsav tsheb, koj tuaj yeem muab qhov chaw xa khoom ntawm lub tshuab computer los ntawm lub computer USB interface. Nyob rau hauv lub logic muaj nuj nqi, kev siv ntawm txoj kev thiab qhov zoo tib yam lub computer serial chaw nres nkoj raws nraim tib yam, kev txhawb nqa feem ntau ntawm cov kev siv ntau yam kev soj ntsuam thiab kev pab cuam ntawm qhov kev pab cuam, qhov kev thov tsis tuaj yeem ua rau muaj kev hloov, koj tuaj yeem nkag mus rau hauv lub cev virtual serial chaw nres nkoj, Khaws qhov kho vajtse thiab software tshaj plaws nyob rau hauv lub tsev ntawm cov khoom qub thaum pib hauv USB khoom. Yog kev siv ntawm "serial debugging assistant" software nyob rau hauv kev sib txuas lus sib txuas lus raws li qhia. Thaum kuaj, virtual chaw nres nkoj yog COM3 tom qab siv lub tshuab xa mus rau lub tshuab computer, thiab cov converter txuas nrog COM1 chaw nres nkoj ntawm lwm lub computer los ntawm RS232 tus qauv kab. Qhov kev sib txuas lus siv baud tus nqi ntawm 9600, 8 lub npav cov ntaub ntawv, 1 nres me ntsis, tsis parity ntsis, 2 ports yuav xa cov ntaub ntawv txhua 1000 tauj.
Nws tuaj yeem pom tau tias qhov hloov qhov sib txuas lus muaj peev xwm sib txuas lus tau zoo ntawm USB / RS232 cov chaw nres nkoj ntawm cov computers sib txawv. Tsis tas li ntawd, kev siv ob lub converters, muaj peev xwm ua tau ntau lub computer USB communication, kev sim ua hauj lwm yog ntseeg tau.