DMX512控制协议及其实现

20029133ZHAOMINGGONGCHENGXUEBAOSep12002Vol113No13DMX512(,430063):DMX512,,:DMX512;;;;TheProtocolandRealizationofDMX512FangFuboLiuYouyuanChenDingfang(WuhanUniversityofTechnology,Wuhan430063)AbstractThispaperintroducesadigitalMultiplexingstandard,andthedataformat,datatransmission,cable,con2nector,terminatorareexplained.Meanwhile,thispaperprovidestheschemetorealizethesystemwithhardwareandsoftward.Keywords:DMX512;Datapacket;controller;dimmer;MicrocontrollerDMX512(UnitedStatesInstituteforTheaterTechnology,USITT),,,,DMX5121DMX512DMX512,,,,,,,11DMX512111DMX512,182DMX250kbPs,4us,44us,512,,88us,Break,Break;Break8usM.a.b(MarkafterBreak);DMX512,M.a.bStart2code,,,Start2code8,;,,DMX512BreakM.a.b,BreakM.a.b1s,,DMX512DMX5122DMX512,2DMX512112DMX512,DMX512EIA485DMX512EIA485,,1km,DMX512,,,,DMX5125XLR,,,3,,DMX512,5:PIN1()PIN2(Datal-)PIN3(Datal+)PIN4(Data2-)PIN5(Data2+)113,23,,,,,DMX51285150,2DMX512:,,,DMX512,DMX512DMX512,,DMX512;,ISAPCI,,,,,,(3)3DMX51295133:DMX512,250kbPs11,2,8M16M4:,Break,,;Startcode,,,Break,,TP311=088usP311=1FTI?T?F4,,0,1,,,,44us,16M(5):050(6):01601(78):188us?F0T1s?FTR3R4710620029SBUFAdata=1?FdataTR3+R4=?FR31R3255?TR41FTdata0RI8[1]AdamBennette.RecommendedPracticeforDMX512.London,1994.[2]StevenB.Carlson.AGuideTourofDMX512.http:[3]ASimpleGuidetoUnderstandingDMX.http:[4]BenJosephAkiba.DMX512/1990DigitalDataTrans2mission.http:mouse.host.sk/download/dmx512.txt,1990.4.[5]..:,1996.7.[6].MCS251,:,1993.8.(57),,,,,,,,4,,,,,,,,,[1]..:,199816133:DMX512