PIC微控制器DMX512通讯

DMX512isacommunicationprotocolusedinmostpro-

fessionaltheaterlightingcomponentssuchasdim-

mers,scanners,movinglights,strobes,etc.This

applicationnotepresentsasolutiontotransmitand

receivetheDMX512communicationprotocolthatcan

beimplementedusinganyPIC

®

microcontrolleroffer-

ingaUniversalAsynchronousReceiverTransmitter

(UART)module.Inparticular,thePIC18F24J10,agen-

eralpurposedevice,wasusedinthecodeexamples

providedwiththisapplicationnote.Itprovides1024

bytesofdatamemory,whichallowsthedemonstration

codetostorethedatafortheentire512channelbuffer

(althoughthisisnotrequiredforthetypicalapplication).

OnlyanexternalRS-485compatibletransceiveris

requiredtocompletetheapplicationschematic.

TheDMXsolutionisprovidedintwoparts:AN1076UsingaPICMicrocontrollerforDMX512Communicationplaceofauto-transformers,becomingquitepopular,Author:ParthivPandyaparticularlythe0-10Vanalogconsoles.Still,thisMicrochipTechnologyInc.systemhadthreemajordrawbacks:1.Itwaspronetonoise.INTRODUCTION2.Dimmingcouldbenonlineardependingondifferentkindsoflamps.DMX512isacommunicationprotocol