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DMX512 Up&Running Guide

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DMX512 Up&Running Guide The lightning ash symbol is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure, that may be of sucient magnitude to constitute a risk of electric shock to persons. The exclamation point is intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING This equipment generates, uses and can radiate frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications. It has been tested and found to comply with the limits for a Class A computing device pursuant to Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference when operated in a commercial environment. Operation of this equipment in a residential area is likely to cause interference, in which case the user, at his own expense, will be required to take whatever measures may be required to correct the interference. If you need help, consult your dealer. You may also nd the following booklet helpful: How To Identify and Resolve Radio-TV Interference Problems. This booklet is available from the U.S. Government Printing Oce, Washington, DC 20402, stock no. 004-000-00345-4. This manual is for informational use only and is subject to change without notice. Philips Lighting Electronics N.A. assumes no responsibility or liability for any claims resultingc from errors or innaccuracies that may appear in this manual. Philips Lighting Electronics N.A. 2828 Trade Center Dr, Ste 130B Carrollton, Texas 75007 DMX512 Up and Running Guide Document part number: 85-1162 Version as of: 12-10-03 ©2012 Philips Lighting Electronics N.A. All Rights Reserved. How to Install DMX512 What is DMX512 So you've been given the job of installing a DMX512-based lighting control system in DMX512 (often shortened to simply "DMX") is a standardized digital a theatre, studio or other facility. You probably have a lot of questions right now. communication signal used to interconnect different kinds of microprocessor based What is DMX512? What does it do? How do I hook it up? lighting control equipment. It uses special data communication cable to transmit Well, don't worry, DMX512 isn't that complicated once you get to know it. However, information to the various pieces of lighting equipment (Dimmers, Color Changers, it does have some very important rules which must be followed in order to construct a Remote Controlled Spotlights, etc.) which may be installed in a theatre or studio. working, reliable system. This booklet will fill you in on everything you need to "DMX" stands for Digital MultipleX, a technique by which infor mation for many know, and make it easy for you to successfully install a DMX512 system. devices may be transmitted digitally over one cable. The messages transmitted in a DMX512 system tell the lighting equipment what to do. For example, messages might set a lamp dimmer to 80% intensity, tell a color IMPORTANT changer to go to a blue color, or direct a moving spotlight to shine on the lead singer This booklet briefly mentions several specific Intelligent Power in a band. These messages are sent by the lighting control desk, which is the master System® (IPS) products. It is not, however, a comprehensive users controller in a theatrical lighting system. The lighting control desk coordinates all of guide for these products. For a full description of their functions the lighting changes throughout the entire theatre. and applications, refer to the "Intelligent Power System Operating Instructions & Installation Guide", which has been included with To construct a DMX512 control system, a specialized cable must be run from the your system lighting controller to every controlled device in the facility. In most cases this cable will connect in a daisy-chain fashion from one device to the next until it reaches the last device in the system. (More about the actual routing of cables later.) When properly connected, all devices in the theatre will instantly respond to commands sent For more information regarding the DMX512 control protocol, refer to the from the lighting control desk. "DMX512/1990 & AMX 192 Standards" and "Recommended Practice for DMX512" The Intelligent Power System lighting control products are designed to use a publications available from United States Institute for Theatre Technology, Inc. DMX512 control network. (USITT). USITT 6443 Ridings Road Syracuse, NY 13206-1111 USA 1-800-93USITT (938-7488) 315-463-6463 Control Desk www.usitt.org Device Device Device Device * Example system diagram. 1 2 What Electrical Signals are Used with DMX512? As you can see, it is very important that all of the signals be correctly hooked up in the DMX512 system. If DMX512 - and DMX512 + get swapped, the DMX512 DMX512 is based on an electronic signaling standard called EIA-485. Under this messages will be transmitted upside down, so to speak, and the receiving equipment standard, signals are sent down a pair of wires, while an additional single wire will not know what to do with them! provides a common voltage reference for the system. So, in order to create one This is a place where a little extra attention during system installation will pay off in a message channel, you need three wires: The two wires in the twisted pair, and the reliable system which works perfectly right off. It can be extremely time consuming common reference wire. If a second message channel is required, you only need to to track down one wrong connection after all of your boxes have been closed up. add a second twisted pair. The common reference wire can serve both pairs. DMX512 requires two message channels, so it uses cable which contains two twisted What Kind of Cables are Used in a DMX512 System? pairs of wire, and one common wire. The common wire also serves as an electrical shield for the cable. So there are a total of five wires in a complete DMX512 cable. For a variety of reasons which are too technical to discuss here, DMX512 is very sensitive to the kind of cable which is used. Not all computer cable is the same, and using the wrong kind may cause the DMX512 system to be unreliable. The key is to Twisted Pair find a cable which is rated by its manufacturer for use in an EIA-485 application. The DMX512 Cable following table lists some commonly available cables which are suitable for Twisted Pair DMX512. You may also find others, but DON'T USE GENERIC SUBSTITUTIONS; Drain (Common Reference) they will cause you nothing but trouble. In order to achieve a high degree of reliability, signals in a DMX512 cable are transmitted in a "differential" fashion. This simply means that when a signal is being Manufacturer Type sent down one wire of the twisted pair, its exact opposite is being sent down the other Alpha 3492C wire of the pair. So, when one wire of the pair swings up to +5 volts, the other wire swings down to 0 volts. The circuitry which receives DMX512 messages always Belden 8132 looks at the difference between the voltages on these two wires, rather than at their Belden 9842 actual voltages, and so is far less sensitive to electrical noise which might be picked Carol/General C0500 up from the outside world. Olflex 2318 As you might have guessed, the five signals in a DMX512 system have specific TMB Proplex names to help you keep them sorted out. These names are descriptive of their function Most of these cables have an uninsulated, stranded wire laid in directly underneath in the DMX512 system. the shield. This wire is called the Drain wire, and it simplifies connections to the shield. When stripping the jacketing off the cable, the shield can be clipped back as Signal Name Symbol Function well. The Drain wire is then the same length as the insulated conductors, and can be easily terminated. Common COM The common reference for the DMX512 system. Also the shield for the cable. DMX512 - D1 - The inverted copy of the signal on the first twisted pair. DMX512 + D1 + The non-inverted copy of the signal on the first twisted pair. TALK - * D2 - The inverted copy of the signal on the second twisted pair. TALK + D2 + The non-inverted copy of the signal on the second twisted pair. Drain Wire (Common Reference) * Intelligent Power System uses the second twisted pair for a function called "Talk Back", and so names the wires TALK - and TALK +. There are no standard names for these wires, so other products may use them for other purposes. Note: Plenum rated wire MUST strictly meet the EIA-485 requirements. 3 4 There are several wiring color codes in common use. The following table summarizes What Connections are Used in DMX512 Systems? those which you may find: There are a number of ways in which different pieces of DMX512 cabling may be DMX512 Western Electric ICEA Belden Standard connected to one another. Portable cables always use a plug-in connector, while Symbol Signal Name Color Code Color Code Color Code junction boxes and racks usually have terminal strips. Common COM Drain Drain Drain The connector used on portable DMX512 cables is specified by the DMX512 DMX512 - D1 - White w/ Blue Stripe Black Black standard. It is a 5-Pin "XLR" type connector. This type of connector is also commonly called a "Cannon" plug, and you are probably familiar with the 3-Pin version which is DMX512 + D1 + Blue w/ White Stripe White Red found on professional microphones and audio equipment.
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