Qhov txawv ntawm RS -232 thiab TTL 232 yog dab tsi?

1, Kev txhais thiab cov qauv
RS-232, tseem hu ua Recommended Standard 232, yog cov ntaub ntawv sib txuas lus tus qauv tsim los ntawm Electronic Industries Association (EIA) hauv Tebchaws Meskas. Nws yog Ameslikas tsim los pab kom muaj kev sib txuas lus ntawm cov computers thiab modems, thiab tom qab ntawd maj mam nthuav mus rau lwm qhov chaw xws li kev lag luam automation, khoom siv kho mob, khoom siv hluav taws xob, thiab lwm yam. RS -232 tus qauv txhais cov yam ntxwv hluav taws xob thiab kev sib txuas ntawm cov teeb liab, ua kom cov cuab yeej tsim los ntawm cov tuam txhab sib txawv sib txuas lus nrog ib leeg.
TTL 232: Lub sij hawm "TTL 232" ntawm no tej zaum yuav yog ib tug misnomer los yog tsis meej pem ntawm lub tswvyim. Nyob rau hauv tus txheej txheem terminology, TTL (Transistor Transformer Logic) feem ntau yog hais txog ib tug digital logic integrated circuit tus qauv siv rau kev tsim thiab tsim cov logic circuits. TTL 232 "yuav xa mus rau lub interface uas siv TTL theem teeb liab rau kev sib txuas lus, lossis ntau dua, ib qho kev sib txuas uas hloov TTL qib rau RS-232 qib rau kev sib txuas lus los ntawm TTL rau RS-232 converter. qhov tseeb ntawm kev sib tham, peb nkag siab "TTL 232" ntawm no raws li tom kawg, uas yog kev hloov pauv hloov pauv ntawm TTL qib thiab RS-232 qib.
2, Cov yam ntxwv hluav taws xob
RS{{{0}}}: RS-232 siv qhov zoo thiab qhov tsis zoo los sawv cev rau cov ntsiab lus hauv lub xeev, nrog rau qib siab ntawm ± 3V txog ± 25V (tab sis hauv kev siv tswv yim, feem ntau ± 5V rau ± 15V). Hauv RS-232 tus qauv, qhov hluav taws xob ntau dua +3V sawv cev rau logic "0", thiab qhov hluav taws xob tsawg dua -3V sawv cev rau logic "1" (ceeb toom: qhov no tsis sib xws rau qee qhov kev piav qhia, tab sis peb ua raws li tus qauv txhais ntawm no). Cov qauv tsim qib no muab RS-232 teeb liab muaj zog tiv thaiv kev cuam tshuam, ua rau lawv haum rau kev sib kis mus ntev.
TTL 232 (TTL rau RS-232): TTL qib siv qib qis (0V rau 0.8V) thiab qib siab (2.4V txog 5V) los sawv cev rau cov logic "{{8 }}" thiab logic "1". Vim tias qhov tsawg voltage ntau ntawm TTL qib thiab lawv qhov cuam tshuam rau kab suab nrov thiab cov teeb liab attenuation, TTL cov teeb liab feem ntau tsuas yog kis tau luv luv xwb. Txawm li cas los xij, los ntawm kev siv TTL rau RS{10}} hloov pauv, TTL qib tuaj yeem hloov mus rau RS{11}} qib, ua kom muaj kev sib txuas lus ntev.
3, Kev sib kis deb thiab ceev
Qhov kis tau tus mob ntawm RS-232: RS-232 nyob ntawm tus nqi sib kis thiab kab suab nrov siv. Feem ntau hais lus, nrog tus nqi sib kis tsawg thiab cov kab zoo, qhov kev sib kis ntawm RS -232 tuaj yeem ncav cuag li 50 ko taw (kwv yees li 15 meters). Txawm li cas los xij, nrog qhov nce ntawm kev sib kis tus nqi thiab kab suab nrov, qhov kev sib kis yuav luv luv.
TTL 232 (TTL rau RS-232): Vim muaj cov kev txwv ntawm TTL theem teeb liab, TTL teeb liab feem ntau tsuas yog kis tau los ntawm qhov deb ntawm ob peb meters mus rau kaum ob meters. Txawm li cas los xij, los ntawm kev hloov mus rau RS-232 qib dhau los ntawm TTL rau RS-232 hloov pauv, qhov kev sib kis tau tuaj yeem txuas ntxiv mus rau kaum metres lossis ntxiv mus.
4, Daim ntawv thov scenarios
RS-232: Vim nws muaj peev xwm tiv thaiv kev cuam tshuam thiab kev sib kis tau ntev, RS-232 tau siv dav hauv cov xwm txheej uas xav tau kev sib txuas lus ntev, xws li kev sib txuas lus ntawm khoos phis tawj thiab modems, kev tswj hwm kev lag luam automation , thiab cov ntaub ntawv xa mus rau cov khoom siv kho mob.
TTL 232 (TTL rau RS-232): TTL rau RS-232 converters feem ntau yog siv nyob rau hauv cov xwm txheej uas TTL theem teeb liab yuav tsum tau hloov mus rau RS-232 theem teeb liab, thiaj li yuav sib txuas lus nrog ntau cov khoom siv raws li RS-232 tus qauv. Piv txwv li, nyob rau hauv embedded system txoj kev loj hlob, developers yuav tsum tau siv ib tug TTL rau RS -232 converter los hloov TTL theem teeb liab tso zis los ntawm lub microcontroller rau hauv RS -232 theem teeb liab rau kev sib txuas lus thiab debugging nrog computers los yog lwm yam khoom siv RS-232.