Assessments - 3, GPA: 3.3
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4 2. Industry Standards .......................................................................................................................................... 5 2.1 USITT .....................................................................................................................................................5 2.2 ESTA ...................................................................................................................................................... 5 2.3 ANSI ....................................................................................................................................................... 6 2.4 EIA/TIA .................................................................................................................................................. 6 2.5 References............................................................................................................................................... 6 3. Theory of Operation........................................................................................................................................ 7 3.1 The Cable TV Analogy...........................................................................................................................8 3.2 DMX Communications......................................................................................................................... 11 3.3 Summary............................................................................................................................................... 13 4. Protocol Specifications ................................................................................................................................. 14 4.1 Connectors ............................................................................................................................................ 15 4.2 Cabling.................................................................................................................................................. 16 4.3 Data....................................................................................................................................................... 17 5. Sample Applications ..................................................................................................................................... 18 5.1 Dimmer Control....................................................................................................................................19 5.2 Intelligent Fixture Control .................................................................................................................... 20 5.3 Dimmer & Intelligent Fixture Control..................................................................................................21 5.4 Distributed Control ...............................................................................................................................22 DMX 101: A DMX 512 Handbook 1. Introduction to DMX 1 This handbook is designed to promote basic understanding of the DMX 512 protocol, including theory of operation, proper equipment use, and some basic application examples. DMX is an acronym for Digital Multiplex, a communication protocol (a set of rules) used to remotely control lighting dimmers and intelligent fixtures. It is designed to provide a common communications standard between these lighting devices regardless of the manufacturer. The 512 after the DMX refers to the number of control channels used on one network segment (often called a ‘universe’) of devices. In a simple dimming system, one channel controls the intensity of one dimmer. A single intelligent fixture, however, may require several channels to control its various parameters (one channel each for pan, tilt, color, gobo, etc.). A basic dimming control console (such as the 16 channel Elation Stage-Setter 8) may support only a few of the 512 available channels. Many professional control consoles (such as the 3 universe, 1536 channel Elation Show Designer 3) support multiple universes, allowing for thousands of control channels. The topics this handbook will cover are: • Industry Standards • Theory of Operation • Protocol Specifications • Sample Applications 4 Elation Professional ® 2. Industry Standards 2. Industry Standards About 20 years ago, most manufacturers used their own, proprietary control protocols. This forced system designers to use only fixtures and control consoles from the same manufacturer. There was no control standard to allow the use of different products. A standard is a set of widely agreed-upon guidelines for interoperability at both communications and mechanical levels. Standardization of protocol and equipment provides many benefits to manufacturers and end users. These benefits include: • Increased product quality and safety • Reduced development time and cost • Sound engineering practices • Protection again...