(I) tuaj yeem thauj cov yam ntxwv
Puas tuaj yeem yog cov lus luv ntawm Cov Chaw Tswj Xyuas Network (tuaj yeem tsim los ntawm Bosch, lub tuam txhab German nto moo rau kev txhim kho hauv cov khoom siv tsheb thiab nws thiaj li ua tus qauv thoob ntiaj teb (ISO11898). Nws yog ib qho ntawm cov chaw tsheb npav ntau tshaj plaws hauv ntiaj teb. Nyob rau hauv North America thiab Western Europe, tuaj yeem muaj cov raws tu qauv rau cov tsheb Lans, thiab muaj cov tsheb thauj khoom loj thiab cov khoom siv hnyav nrog cov qauv hauv nruab nrab. Nyob rau hauv xyoo tsis ntev los no, nws txoj kev ntseeg siab thiab muaj lub peev xwm ua tau zoo tau hais tseg, thiab nws yog dav siv hauv kev ntsuas hluav taws xob, muaj zog hluav taws xob hluav taws xob thiab kev co hluav taws xob ntau.
Nta:
Ntev kis nrug deb (txog li 10km) thiab tus kis ceev (nce mus txog 1mHz BPS);
Ib lub tsheb npav tuaj yeem txuas mus txog 110 nodes, thiab cov naj npawb ntawm cov nodes tuaj yeem nthuav yooj yim;
Multi - Master qauv, sib npaug ntawm txhua qhov ntawm, yooj yim cheeb tsam kev siv hluav taws xob, kev siv tsheb loj;
Siab tiag {{- lub sij hawm, tsis- Kev puas tsuaj thev naus laus zis
Kev yuam kev tuaj yeem tiv thaiv tau cov nodes yuav txiav tawm thiab txiav tawm qhov txuas nrog lub npav, tsis muaj kev cuam tshuam lub npav sib txuas lus;
Cov lus yog luv qauv qauv thiab kho vajtse CRC checksum, qhov tshwm sim ntawm kev cuam tshuam yog me me, cov ntaub ntawv yuam kev yog tsawg heev;
Tau txheeb xyuas seb cov lus tau xa tiav los yog tsis tau, thiab tuaj yeem cia li rov qab kho vajtse, yog li cov kev xa khoom tuaj yeem yog heev;
Cov Khoom Siv Khoom Siv Lim Ua Haujlwm, tsuas yog tau txais cov ntaub ntawv tsim nyog, txo lub nra rau ntawm CPU, yooj yim rau kev npaj software;
(II) RS485 Tsheb npav npav
Rs - 485 adopts ib nrab- kev ua haujlwm duplex kev sib txuas lus thiab kev txhawb nqa ntau cov ntaub ntawv sib txuas lus. Rs-485 npav network sab saum toj yog feem ntau adopts hnub caiv sib xws. Ntawd yog, lub tsheb npav siv los txuas txhua txhua lub ntawm hauv series, thiab tsis txhawb nqa lub nplhaib lossis Star Network. Rs-485 adopts balanced kis thiab muaj kev txais tos lwm tus, yog li nws muaj peev xwm los txhawb kev cuam tshuam nrog kev cuam tshuam hom. Ntxiv rau lub tsheb npav hloov chaw muaj qhov siab siab, tuaj yeem tshawb xyuas voltages kom tsawg li 200mv, yog li cov paib kis tau tuaj yeem rov qab dhau ntawm cov mais. Qee qhov kev hloov pauv Rs-485 hloov kho cov ntsiab lus impedance cia rau tib lub npav.Qhov kev sib txuas lus nyob rau hauv cov tswj hwm logic hauv kev lag luam ib puag ncig.
Cov yam ntxwv Rs-485 hluav taws xob: Qhov sib txawv hluav taws xob ntawm ob kab kev sib txuam nrog lub ntsej muag sib txawv, nws tuaj yeem sib txuas nrog TTL circuits TTL;
Cov ntaub ntawv ntau tshaj kis tus nqi ntawm Rs-485 yog 10mbps;
Rs - 485 interface yog kev siv cov neeg tsav tsheb sib txuas thiab}}}}}}}} anti-anti-anti-anti-zoo kev cuam tshuam;
Qhov kev sib kis tau tshaj plaws ntawm Rs - 485 interface yog sib piv ntawm 4000 ft, tab sis hauv kev ua nws tuaj yeem ua tau li 3000 m. Qhov Rs-485 interface tso cai rau kev sib txuas ntawm 128 transceivers hauv npav. Qhov Rs-485 interface tso cai rau txog 128 transceivers kom txuas rau hauv lub npav, piv txwv li, nws muaj ntau qhov chaw nres tsheb tuaj yeem kis tau ntawm Rs-485 lub npav txhua lub sijhawm;
Rs - 485 interface muaj qhov ua tau zoo rau cov suab kev cuam tshuam nrog thiab ntau qhov chaw sib nrug thiab lwm yam kev sib tw ua rau nws xav tau cov kev nyiam ua ke;
Rs485 interface muaj ntawm ib nrab- network, feem ntau tsuas yog ob lub interface yog daim thaiv sib tw sib kis tau khub.
(III) tuaj yeem npav thiab Rs485 lub npav npav
Yav dhau los, PC thiab Smart ntaus sib txuas lus nrog kev pab ntawm RS232, RS485, Ethernet thiab lwm txoj kev, feem ntau yog nyob ntawm cov khoom siv interface cov lus qhia tshwj xeeb. But RS232, RS485 can only represent the communication of the physical media layer and link layer, if you want to achieve two-way access to data, you must write their own communication applications, but most of this program can not meet the ISO/OSI specifications, can only achieve a single function, for a single type of equipment, the program does not have the generality.
Nyob rau hauv RS232 lossis RS485 rau hauv lub network ntawm cov khoom siv, yog tias muaj cov cuab yeej sib txuas lus hauv nruab nrab, thiab cov khoom siv sib txuas lus tseem ceeb ntau, thiab cov cuab yeej sib txuas lus feem ntau yog ib qho ntawm cov cuab yeej hauv lub network, thiab tus so yog txhua tus los ntawm (Qhev) cov khoom siv). Cov teb cov tshuab yog ua raws ISO / OSI qauv txhawb nqa los daws cov chaw tsheb npav los daws cov chaw tos npav, kev kho tsis sib haum thiab lwm yam teeb meem. Teb cov cuab yeej ua haujlwm tau ua ib lub network, tsis muaj tus tswv / qhev cuab yeej lossis tso cai rau ntau tus masters. Nyob rau tib theem, cov khoom lag luam sib txawv tuaj yeem hloov kho, thiab cov cuab yeej cuam tshuam nrog txhua lwm yam.
Tam sim no, muaj ntau hom tsheb npav tuaj yeem piv rau lwm lub npav? Ua ntej tshaj plaws, sib piv cov npav 585, 485 lub npav yog ib qib kev ua raws, thiab 232 yuav luag txhua yam, tab sis qhov ntawd tsis yog qhov tsim nyog, tab sis nws yuav pab koj nkag siab.
(Iv) tuaj yeem npav PK RS485 npav
Muaj peev xwm (maub los hauv Cheeb Tsam Network) zwm rau cov teb qeb, nws yog kev tswj hwm tau zoo rau kev faib tawm lossis tiag {} tswj kev sib txuas lus network. Piv nrog cov Rs tam sim no tam sim no raws tus Rine, cov faib cov kev tswj hwm raws li tuaj yeem pom zoo tshaj plaws hauv cov hauv qab no:
(1) Tus tswj hwm ua haujlwm hauv ntau {{}} Master hom kev sib tw los xa cov ntaub ntawv chaw nres tsheb, thiab hloov chaw ntawm cov ntaub ntawv sib txuas lus, uas tso cai Nodes sib txawv kom tau txais cov ntaub ntawv sib txawv tib lub sijhawm, cov qauv no ua rau cov ntaub ntawv sib txuas lus ntawm cov khoom lag luam tsis muaj peev xwm txhim kho kev ntseeg tau ntawm cov kab ke thiab qhov hloov tau ntawm cov kab ke. Kev siv ntawm Rs - 485 tsuas tuaj yeem tsim tus tswv kev xaiv tsa, thiab cov chaw sib txuas lus tsuas yog ua rau lub chaw ua haujlwm, yog li qhov chaw nyob tiag tiag, yog li kev ntseeg tau ntawm lub system tsis zoo.
(2) Lub tsheb npav muaj peev xwm txuas nrog lub npav lub cev los ntawm ob qho kev tawm ntawm lub davhlau ya nyob twg tsuas yog ncua sijhawm tuaj yeem yog qhov tsis muaj peev xwm tsuas yog muaj tsawg lossis tshem tawm. Qhov no ua kom muaj qhov tshwm sim tsis muaj qhov tshwm sim tsis muaj qhov tshwm sim zoo li hauv lub system Rs-485, thaum muaj ntau cov nodes xa cov ntaub ntawv rau tib lub sijhawm, uas nyob rau hauv lub npav nthuav qhia luv luv, yog li ua rau qee cov nodes. Thiab tuaj yeem tiv thaiv cov teeb meem loj nrog tsis siv neeg kaw kev ua haujlwm, yog li yuav tsis muaj teeb meem, yog li yuav tsis muaj teeb meem, kom lub tsheb npav muaj teeb meem "lub xeev tuag.
(3) Muaj peev xwm muaj kev sib txuas lus zoo meej, tuaj yeem pom tau los ntawm tus tuaj yeem tswj hwm, ua kom luv luv ntawm kev txhim kho system, cov no tsuas yog muaj kev sib cav sib zog hluav taws xob, ua kom muaj hluav taws xob muaj hluav taws xob.