DMX512, is a control protocol, used in most theatres to control dimmers and intelligent fixtures. DMX, is the 9L0-402 replacement of AMX192 which is an analouge system that is based around using a voltage difference between 0-10V to control lights. DMX 512, has many advantages over the old AMX system: DMX, can be used to control intelligent moving lights, and is much easier to interface with computer based systems.
The DMX system consists of what are refered to as channels, and the value of each channel varies from 0 to 255. However in the case of a dimmer, this would normally be changed on the controlling device so that the brightness was displayed in a percentage form. Each XLR cable run, can carry up to 512 channels, hence DMX is refered to as DMX512.
DMX 512, works on a system 9L0-509 of highs and lows, and packets of data; these packets that tell the fixture or dimmer what to do and are refreshed as soon as the last packet has finished being interpreted. When there are no channels transmitting data in what is known as a 'no-data' situation, the DMX control device will output a continuous high signal.
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