1, Interface txhais
USB TTL:
USB (Universal Serial Bus) yog tus qauv siv dav dav siv los txuas cov khoos phis tawj nrog cov khoom siv sab nraud. TTL (Transformer Transformer Logic) yog tus qauv theem uas feem ntau siv rau kev sib cuam tshuam ntawm cov khoom siv hluav taws xob xws li microcontrollers thiab sensors. USB TTL feem ntau yog hais txog TTL theem kev sib txuas lus ua tiav los ntawm USB interface, uas feem ntau yuav tsum tau siv cov kev hloov pauv tshwj xeeb (xws li PL2303, CP2102, thiab lwm yam) los hloov USB cov cim rau TTL qib.
RS -232:
RS-232 yog cov ntaub ntawv sib txuas lus tus qauv tsim thiab luam tawm los ntawm Electronics Industry Association (EIA), feem ntau hu ua EIA-RS-232C tus qauv. Nws txhais tau hais tias lub cev sib cuam tshuam thiab hluav taws xob cov yam ntxwv ntawm Cov Khoom Siv Hluav Taws Xob (DTE) thiab Cov Khoom Siv Sib Txuas Lus (DCE). RS-232 interfaces feem ntau siv DB-9 lossis DB-25 cov khoom txuas nrog ntau cov kab teeb liab, suav nrog cov ntaub ntawv kab, kab tswj, kab sijhawm, thiab hauv av xaim.
2, Qib tus qauv
USB TTL:
Tus txheej txheem TTL tau teev tseg tias logic "1" (theem siab) feem ntau yog siab dua 2V, thiab logic "0" (theem qis) feem ntau yog qis dua 0.8V. Lub teeb liab TTL yog ib qho teeb liab kawg uas txiav txim siab qhov voltage theem txheeb ze rau hauv av (GND). Vim qhov yooj yim ntawm TTL theem teeb liab thiab lawv cov ntawv thov dav hauv hluav taws xob thiab digital circuits, USB TTL interfaces muaj ntau dua hauv cov khoom siv xws li microcontrollers thiab sensors.
RS -232:
Cov txheej txheem theem ntawm RS {{0}} yog txawv kiag li, raws li nws siv qhov zoo thiab qhov tsis zoo voltages los sawv cev rau lub xeev kev xav. Tshwj xeeb, binary "1" yog sawv cev los ntawm qhov hluav taws xob hauv qab -3V, thiab binary "0" yog sawv cev los ntawm qhov hluav taws xob saum toj no +3V (feem ntau yog+5V rau+15 V hauv kev siv tiag). Cov txheej txheem qib no muab RS -232 interface siab hluav taws xob los tiv thaiv kev cuam tshuam, tab sis nws kuj ua rau kom qhov nyuaj ntawm kev tsim hluav taws xob.
3, Kev sib kis tus nqi thiab kev ncua deb
USB TTL:
Vim qhov tseeb tias USB interface nws tus kheej txhawb kev hloov pauv siab (xws li USB 2. Txawm li cas los xij, qhov kev ncua deb ntawm TTL qib yog luv luv, uas feem ntau haum rau kev sib txuas lus luv luv hauv cov khoom siv lossis kev sib txuas lus ze ntawm cov khoom siv.
RS -232:
Txawm hais tias RS -232 interface muaj cov ntaub ntawv sib kis tau qis (txog 19.2kbps), nws qhov kev sib kis tau ntev heev. Raws li cov txheej txheem, qhov siab tshaj plaws kis tau tus mob ntawm RS -232 interface tuaj yeem ncav cuag 15 meters (tejzaum nws ntxiv thaum siv cov cables zoo). Qhov no ua rau RS-232 cuam tshuam qee qhov zoo hauv cov xwm txheej uas xav tau kev sib txuas lus mus ntev.
4, Daim ntawv thov scenarios
USB TTL:
USB TTL interface yog dav siv hauv cov khoom siv xws li microcontrollers, sensors, thiab kev loj hlob boards vim nws qhov kev kub ceev thiab yooj yim. Los ntawm USB TTL interface, cov neeg siv tau yooj yim txuas cov cuab yeej no mus rau lub khoos phis tawj rau kev debugging, programming, lossis hloov cov ntaub ntawv.
RS -232:
RS -232 interface yog dav siv hauv kev lag luam automation, khoom siv sib txuas lus, cov cuab yeej thiab lwm yam kev lag luam vim nws qhov kev sib kis ntev thiab muaj peev xwm tiv thaiv kev cuam tshuam. Tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej uas xav tau kev sib txuas lus ntev lossis kev sib txuas lus siab, RS -232 interface yog qhov tseem ceeb.
5, Txoj kev sib txuas
USB TTL:
Thaum txuas lub USB TTL interface, feem ntau yuav tsum siv USB rau TTL hloov dua siab tshiab module lossis nti (xws li PL2303, CP2102, thiab lwm yam). Cov kev hloov pauv no lossis cov chips tuaj yeem hloov cov teeb liab USB rau hauv TTL theem pib, yog li ua tiav kev sib txuas lus nrog TTL qib khoom siv.
RS -232:
Thaum txuas RS-232 interface, nws yog ib qho tsim nyog yuav tsum siv cov cables thiab cov khoom sib txuas uas ua raws li RS-232 tus qauv. Cov kab hluav taws xob thiab cov khoom txuas no muaj cov pins tshwj xeeb thiab cov yam ntxwv ntawm hluav taws xob yuav tsum tau ua kom muaj kev ntseeg siab thiab ruaj khov ntawm cov ntaub ntawv xa mus.
