DMX512 raws tu qauv yog thawj tsim los ntawm USITT (American theatre Technology Association) los tswj tus dimmer los ntawm ib tus console nrog tus qauv digital interface. DMX512 transcends lub analog system, tab sis nws tsis tau hloov tag nrho analog system. Lub simplicity, kev ntseeg tau thiab yooj yim ntawm DMX512 ua rau nws txiav txim siab ceev nyiaj. Ntxiv rau qhov kom dimmer, muaj ntau cov kev tswj cov khoom siv ua pov thawj. DMX512 tseem yog ib lub tswv yim tshiab ntawm kev tshawb fawb, nrog ntau hom kev lag luam zoo dua rau cov cai.
Lub ntsiab lus ntawm 1.1 DMX512 raws tu qauv
DMX512 yog tus txheej txheem thoob ntiaj teb rau kev ceev ntaub ntawv xa xov. Kev siv RS485 cov cuab yeej kho mob sib txawv ntawm qhov kev sib txuas lus ntawm RS485.
1.1.1. siv ib txoj kev sib txuas lus. Txawm hais tias DMX512 raws tu qauv yuav txuas tau cov tuam txhab ntau ntawm cov khoom thiab qhov kev siv ntawm kev tswj, tab sis tsuas yog ib txoj kev kis tau, ntawm lub nplaub tshev thiab lub teeb tsis tuaj yeem ua kom cuag cov lus qhia tiag tiag, cov ntaub ntawv tswj teeb meem tsuas yog kev sib tw tau txais cov console, nws lub xeev cov ntaub ntawv tuaj yeem tawm tswv yim rau lub console. Ib qho chaw nyob zoo yuav tsum tau npaj rau txhua lub teeb ua ntej kom lub teeb thiaj txais tau cov lus qhia tswj kom tseeb thiab tsis zoo. Tab sis vim tias tsis muaj kev sib kis ntawm qhov chaw nyob hauv kablus qauv, yog li yog ib qhov teebmeem ntawm cov teeb meem cuam tshuam los ntawm qhov ua yuam kev nyob rau hauv kev sib kis, ces tag nrho cov ntaub ntawv ntawm qhov xwm txheej kuj qab lub misinformation, cov ntaub ntawv yuam kev, lub teeb tsis tuaj yeem rov yuam kev cov ntaub ntawv, uas yog lub ntsiab tseem ceeb ntawm DMX512LED underwater lub teeb tsis yooj yim rau kev tawm teeb liab cuam tshuam.
1.1.2 DMX 512 kev sib txuas lus yuav tsum xa cov ntaub ntawv qis tshaj ntawm 88us ua cov qauv pib ntawm cov ntaub ntawv. Tus neeg tau txais kev pabcuam tau lub sijhawm tshawb nrhiav qhov kev sibtw, thiab nws xav nrhiav cov qauv ntawm cov ntaub ntawv thiab tsis muaj kev sib txuas lus.
Qhov ruaj baud tus nqi ntawm 1.1.3 DMX 512 kev sib txuas lus yog 250Kbps. Vim tias qhov kev sib txuas lus ntawm kev sib txuas lus, kev ua haujlwm siab thiab kev ntseeg siab, nws yog dav siv nyob rau hauv kev lag luam theem kev lag luam, thiab sib haum nrog DMX 512 kev sib txuas lus nruab nrab yog qhov kev xaiv qhov pom kev siab zog LED teeb pom kev zoo tswj.
Cov yam ntxwv hluav taws xob ntawm 1.2 DMX512
DMX512 siv tus qauv EIA-485.
Lub transmitter: Logic "1" yog sawv cev los ntawm ob kab ntawm qhov siab sib txawv + (2 ~ 6) V;
Lub logic "0" yog sawv cev ntawm qhov sib txawv ntawm ob kab - (2 ~ 6) V.
Txais: Ib tug ntau tshaj 200mV siab tshaj B, uas yog xav tias yog cov zajlus kom "1";
A yog ntau tshaj 200mV qis dua B, uas yog xav tias yuav tsum muaj "0".
Cov ncauj lus kom ntxaws qhia txog 1.3 DMX512 raws tu qauv
Tus DMX 512 kis tau tus nqi yog tsau rau 250Kbps, lub sij hawm ntawm txhua cov ntaub ntawv me ntsis yog 4us, thiab txhua txhua byte yog kaum ib pawg, uas yog, 44us
(1 thib ob = 1,000 millisecond 1 milliseconds = 1000 microseconds)
Yog li cov ntaub ntawv hloov lub sij hawm ntawm 512 bytes yog 44 * 512 = 22.528ms
Header cov ntaub ntawv feem ntau yog 88us, ces cov duab header cov ntaub ntawv yog ib qho tsis pub ntev, 8us-1ms, pob ntawv ntawm 512 bytes thiab ib byte, said ntaus ntawv los yog kev cai, feem ntau yog 0 bytes ntawm cov ntaub ntawv muaj, sau tsis siv neeg chaws rau kev hais kom ua.
Ob, DMX512 LED underwater teeb ntau lawm yuav tsum muaj cov ntsiab lus tseem ceeb:
2.1 LED teeb lub teeb thiab kev tsav tsheb tswj kom tau raws li cov cai ntawm DMX512 tswj tus qauv
Tswj teeb nrog built-in DMX512 decoder nti thiab sab nraud DMX512 console thiab lub computer DMX512 LED dej, DMX512 los ntawm console los yog lub computer kom paub lub suab paj nruag ciav DMX512 LED underwater lub teeb gradient, dhia, xim flashing, random blinking, alternating gradient thiab dynamic effect, thiab los ntawm ntau txheej DMX512 LED teeb lub teeb., uas tuaj yeem tau txais kev ywj siab tswj ntawm cov arbitrary DMX512 underwater teeb. High power LED underwater teeb, feem ntau: 6W, 12W, 18W, 24W, 36W, 48W, 54W, 64W, 72W, 108W thiab lwm yam kev qhia.