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Some DMX slave devices have built-in terminators that can be manually activated with a mechanical switch or by software, or by automatically sensing the absence of a connected cable. A DMX512 network is called a "DMX universe". [4] Each OUT connector on a DMX512 controller can control a single universe.
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.
The protocol can address 32768 DMX "universes", each of 512 channels, limited by bandwidth. The fixed addressing can be problematic in networks with other addressing requirements. [3] Revision Q of the protocol addressed this problem by adding 10.0.0.0/8 as an addressing scheme. For node discovery, broadcast packets are used.
These lighting console solutions use software with a feature set similar to that found in a hardware-based console. As dimmers, automated fixtures and other standard lighting devices do not generally have current standard computer interfaces, options such as DMX-512 ports and fader/submaster panels connected via USB are commonplace.
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The Symmetrix DMX Architecture featured Channel Directors for host communication, Disk Directors for disk communication, and Global Memory Directors for I/O delivery from hosts to Disk Directors. [6] In 2009, EMC introduced the Virtual Matrix Architecture, which was a re-design of the DMX architecture to reflect the ongoing virtualization trend.
The major advantage of a lighting control system over stand-alone lighting controls or conventional manual switching is the ability to control individual lights or groups of lights from a single user interface device.
In a 96 dimmer rack, there are 32 dimmers on phase A, 32 dimmers on phase B, and 32 on phase C to spread out the lighting load as equally as possible. In addition to the power feed from the supply transformer in the building, a control cable from the lighting desk carries information to the dimmers in a control protocol such as DMX-512. The ...
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