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DMX512 electrical specifications are identical to those of the EIA-485-A standard, except where stated otherwise in E1.11 [example needed]. DMX512 is a bus network no more than 400 metres (1,300 ft) long, with not more than 32 unit loads (individual devices connected) on a single bus. If more than 32 unit loads need to communicate, the network ...
Art-Net is a royalty-free communications protocol for transmitting the DMX512-A lighting control protocol and Remote Device management (RDM) protocol over the User Datagram Protocol (UDP) of the Internet protocol suite. [1]
Remote Device Management (RDM) is an addition to the DMX512 control protocol for stage lighting equipment, introduced in 2006. DMX512 was developed in the late 1980s as a standard protocol for lighting consoles to communicate with dimmers, but has since been used for more complex applications, including the control of intelligent lighting fixtures.
DMX512 is a standard from the United States Institute for Theatre Technology (USITT). It is a recommended practice to allow lighting systems to "talk." Before DMX512, every manufacturer had its own means of controlling their fixtures. This was inconvenient being that many theatres do not use lights from one single company. [29]
A major protocol ANSI E1.31 known as Streaming ACN or sACN was developed by the same organization and uses the Root Layer and PDU format of ACN to transport the data of DMX512 data over IP networks (or any other ACN compatible transport). A number of further Interoperability Profiles have been developed and standardized by PLASA. These include:
ESTA is currently in charge of reviewing the DMX512 protocol (Digital MultipleX) as well as the development of the new sACN protocol (Advanced Control Network), both communications protocols used to control the lighting of scenarios and special effects.
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In 1985, the first moving head to use the DMX512 protocol was produced by Summa Technologies. Up until that time, moving lights were using other communication protocols, such as DIN8, AMX, D54 and the proprietary protocols of other companies, such as VariLite, Tasco, High End and Coemar.