RS-232/422 TXUJ KEV MUAB KEV PAB RAU TXHUA HNUB RS-232

Lus Nug: Kuv xav siv RS-232 los siv RS-422 hloov dua siab tshiab mus cuag RS-232. Kuv yuav ua li cas rau lawv?

A: Nws nyob ntawm ob qhov khoom sib txuas nrog, seb lawv yog DTE lossis DCE cov khoom siv, lawv txuas lawv ua ke ua ntej muab qhov RS-232 / RS-422 Converter, ntau npaum li cas rau cov kab lus. Cov ntaub ntawv no yog rau cov cuab yeej tsuas tau Txais (Rx) thiab Xa (txawb) teeb liab xwb, lwm yam khoom siv kom muaj ntau yam txuas ntxiv.

A1: CASE # 1: Ntaus ntawv txuas ncaj nraim mus rau qhov chaw nres nkoj hauv computer. Lub computer serial chaw nres nkoj yog teeb tsa raws li lub chaw nres nkoj DTE, cov twj cab ntaus tau teeb tsa ua DCE txuas ncaj qha. Nrog rau qhov kev sib txuas, thawj tus kab sib txuas ntawm RS-422 txuas nrog tus Txheem Suab hlua xov tooj pin # 1 rau # 1, # 2 mus # 2, thiab lwm yam. Qhov thib ob hloov khoom siv qhov kev txuas nruab nrab ntawm nws thiab ntaus ntawv, txij li peb lub converter teeb tsa ua DCE rau ntawm RS-232 sab, thiab cov twj cab kuj yog DCE. Saib daim duab txuas rau CASE # 1.

A2: CASE # 2: Ntaus ntawv txuas los ntawm Kev Tshawb Fawb (Crossover) Cable mus rau qhov chaw nres nkoj hauv Computer. Qhov kev txuas thawj qhov no yuav tsum muaj ib lub qauv Cable tawm vim ob lub Computer thiab Ntaus siv ua DTE. Hauv qhov no, thawj RS-422 Converter txuas mus rau lub Khoos phib tawj nrog rau tus Txheem Suab Kab Xauv PIN # 1 mus # 1, # 2 mus # 2, thiab lwm yam. Tus Thawj Nruab Nrab Thov Cable yog muab cia, tsis siv. Ib tug tshiab Txheem Cable txuas nrog lub ntaus ntawv thiab qhov thib ob hloov khoom siv. Saib daim duab txuas rau CASE # 2.

A3: CASE # 3: Hauv peb qhov teeb meem, peb xav txuas ntxiv rau ntawm RS-232 txuas nruab nrab ntawm ob yam khoom siv, tab sis peb tsis paub tias qhov teeb meem twg yog qhov teeb meem twg. Ob leeg siv cov DB9F (poj niam) sib txuas. Peb muaj ib qhov ntsuas pa. Peb paub tias cov hloov khoom siv yog DCE cov khoom siv. Thaum siv, qhov tso tawm RS-232 yuav muaj qhov tsis zoo rau DC thaum piv rau GND. Yog li, peb txuas tus Txheem Cable rau tus ntaus ntawv, fais fab nws, kev ntsuas ntawm Pin # 5 ntawm txoj kab rau Pin # 3. Yog hais tias nws muaj qhov hluav taws xob rho tawm (feem ntau ntawm -3VDC rau -11VDC), txuas mus rau DB9 connector ntawm qhov hloov khoom nruab nrog. Qhov kev txuas no yuav tsum ua li cas. Yog hais tias yuav luag tsis muaj qhov teeb meem ntawm Pin # 3, kos Pin # 2. Yog hais tias nws muaj qhov tshem tawm qhov hluav taws xob, siv lub Kev Txuas Lus Nruab Nrab nruab nrab ntawm cov cuab yeej thiab sib tsoo los txuas qhov sib txuas ntawm tus pin. Yog hais tias tsis yog tus twg muaj qhov voltage, koj xav tau pinouts rau lub connector / cable. Ua ib qho kev sim zoo sib xws rau kev sib txuas ntawm RS-232 ntawm lwm qhov kawg. Qhov voltage yuav tsum yog nyob rau txoj hlua txuas rau Pin # 3. Tsis muaj daim duab txuas rau CASE # 3, nws yuav ua kom sib haum CASE # 1 los yog CASE # 2, tiam sis nws kuj yuav tsum tau txuas nrog Kev Txuas Lus Nruab Nrab ntawm ob tog xaib yog tias tsis to taub .

Cov naj npawb tus pin rau cov kev sib txuas ntawm RS-422 tsis muaj qhia, lawv yuav txawv raws li tus qauv, tab sis lub npe lub npe yuav tshwm nyob hauv cov ntawv qhia.

Thaum sib txuas ntawm DB25 RS-232, Pin # 2 yog TD, Pin # 3 yog RD, thiab Pin # 7 yog GND.

Ceebtoom: Cov duab no tsis pom cov khoom siv lossis cov khoom xuas tes rau lub zog "chaw nres nkoj" hloov chaw. Qhov chaw nres tsheb ciav hlau feem ntau yuav tsum tau RTS kab thiab DTR kab siab tshaj (teeb liab theem + 11 VDC), yuav tsum muaj lub hwj huam rau ob qho tag nrho yog tias RS-422 transmitter hluav taws xob tsawg tshaj 4.4 volts TD (B) rau TD (A ). Rau cov pinouts ntawm RS-232, xa mus rau FAQ ntawm RS-232 Kev Sib Txuas Ua Ntej!

Cov ntaub ntawv no yuav pab koj ua cov kev sib txuas lus uas yuav tsum tau muaj rau cov kev sib txuas sib tham.