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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.
It is generally attached to the gel frame holder at the transmitting end of a lighting fixture, so colour is introduced after the beam characteristics have been defined by the optics of the lighting instrument. Most scrollers are controlled via DMX512 protocol, but some models (e.g. Wybron's Colouram IT) also utilize the RDM protocol.
The common architecture specification defines a format of nested protocol data units (PDUs), rather similar to TLV encoding, which are used in the main protocols. It then defines how a minimal Root Layer Protocol is used to splice the higher level protocols into a lower level transport and defines such a Root Layer Protocol using the PDU format for use on UDP/IP.
Javid Butler 09:35, 23 February 2007 (UTC) Page name should be changed to DMX512, which is the only name the protocol has ever had. [I aggree with you the name should be changed to the generic name, DMX512-A refers only to the 2004 revision of DMX512 and the article deals also with older revisions so the title is at least a bit misleading...
The final nail in the coffin for the VLDi was the mass migration of the lighting industry to the DMX512 protocol. The "i" in the VLDi acronym is still generally included in all verbal and written communications referring to the product. This is done to avoid potential confusion with the initials of Vari-lite Deutschland (VLD).
Digital Addressable Lighting Interface (DALI) is a trademark for network-based products that control lighting.The underlying technology was established by a consortium of lighting equipment manufacturers as a successor for 1-10 V/ 0–10 V lighting control systems, and as an open standard alternative to several proprietary protocols.