DMX512 employs RS-485 differential signaling at its physical layer.\u00a0 DMX512 uses a unidirectional simplex communication protocol.<\/p>\n
the following is a paraphase from Wiki:\u00a0 DMX512 is a bus network that works upto\u00a01,200 metres long, provided\u00a0you don’t have\u00a0 more than 32 receivers on a single bus. If more than 32 recivers are needed in a single universe,\u00a0\u00a0it can be expanded across parallel buses using DMX splitters. DMX wiring\u00a0 consists of a shielded twisted pair, with a characteristic impedance of 120 Ohms, with a termination resistor at the end of the cable furthest from the controller to absorb signal reflections.\u00a0\u00a0\u00a0 Go read some more here.<\/a><\/p>\n Wiki also has a realy good graphic Simple DMX Network Bus<\/a><\/p>\n Traditionally the christmas lights fraternity add DMX terminators to each controller withe link pack to select the terminator if it the the last one on the bus.\u00a0 I have added thenm to most of my designs too. For example X10 on my 8Ch DC Controller.<\/a><\/p>\n But here’s the rub.\u00a0 I never fit the link packs.\u00a0 I too lasy. and then I forget which one has the terminator installer.\u00a0 So I so a for more visual termintator.<\/p>\n These terminators are a cinch to make and are pretty reliable too. the cost is super good.\u00a0 the last lot cost me 6.5 cents each.<\/p>\n Material:<\/p>\n Proceedure:<\/p>\n Just a coupleo of notes:<\/p>\n\n
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![Simple DMX Network Bus<\/a><\/p>\nTraditionally the christmas lights fraternity add DMX terminators to each controller withe link pack to select the terminator if it the the last one on the bus.\u00a0 I have added thenm to most of my designs too. For example X10 on my 8Ch DC Controller.<\/a><\/p>\nBut here’s the rub.\u00a0 I never fit the link packs.\u00a0 I too lasy. and then I forget which one has the terminator installer.\u00a0 So I so a for more visual termintator.<\/p>\nThese terminators are a cinch to make and are pretty reliable too. the cost is super good.\u00a0 the last lot cost me 6.5 cents each.<\/p>\nMaterial:<\/p>\n\nRJ 455 plug<\/li>\n120 ohm 1\/4W Resistor (1\/8\u00a0W also work)<\/li>\nscrap Cat 5 wire insulation<\/li>\nhot glue ( optional)<\/li>\n<\/ul>\nProceedure:<\/p>\n\nBent one end of the resistor lead back over the body of the resistor.<\/li>\nPlace the resistor on the outside of the body with the two leads alnign with the pins.\u00a0\u00a0You want the body of the\u00a0resistor to be just an the end of the pins.\u00a0 Trim the leads.\u00a0 I trim mine to XXmm.<\/li>\nAdd some scrap Cat5 wire insulation to the resistors leads before inserting hte resistor in the connector housing and crimping.<\/li>\nOnce your done, your can add a blob of hot glue or silastic the seal the end.<\/li>\n<\/ul>\nJust a coupleo of notes:<\/p>\n\n1\/8W and 1\/4W\u00a0resistors are small and have 0.4mm diameters leads which is a tad smaller than Cat5 (0.51mm)\u00a0 the body is also small enough to fit inside the connector housing<\/li>\nThere are two types of connectors dependant on your cable type, solid or stranded cable.\u00a0 Try and purchase some connectors suitable for solid wire for this project.<\/li>\n<\/ol>\n](\"http:\/\/en.wikipedia.org\/wiki\/File:SimpleDmxUniverse.gif\"){kind=link}