APPENDIX

DMX Primer

There are 512 channels in a DMX-512 connection. Channels may be assigned in any manner. A fixture capable of receiving DMX 512 will require one or a number of sequential channels. The user must assign a starting address on the fixture that indicates the first channel reserved in the controller. There are many different types of DMX controllable fixtures and they all may vary in the total number of channels required. Choosing a start address should be planned in advance. Channels should never overlap. If they do, this will result in erratic operation of the fixtures whose starting address is set incorrectly. You can however, control multiple fixtures of the same type using the same starting address as long as the intended result is that of unison movement or operation. In other words, the fixtures will be slaved together and all respond exactly the same.

DMX fixtures are designed to receive data through a serial Daisy Chain. A Daisy Chain connection is where the DATA OUT of one fixture connects to the DATA IN of the next fixture. The order in which the fixtures are connected is not important and has no effect on how a controller communicates to each fixture. Use an order that provides for the easiest and most direct cabling. Connect fixtures using shielded two conductor twisted pair cable with three pin XLR male to female connectors. The shield connection is pin 1, while pin 2 is Data Negative (S-) and pin 3 is Data positive (S+). CHAUVET carries 3-pin DMX compliant cables, DMX-10 (33’), DMX-4.5 (15’) and DMX-1.5 (5’)

FIXTURE LINKING

Figure 1 - DMX connector configuration

 

 

COMMON

1

3

DMX +

INPUT

 

2

DMX -

 

 

 

1

Resistance 120

 

ohm 1/4w between

 

3

 

pin 2 (DMX -) and

 

2

pin 3 (DMX +) of

 

 

the last fixture.

1

OUTPUT

 

3

 

2

Termination reduces signal errors and to

 

avoid signal transmission problems and

 

interference, it is always advisable to connect

 

a DMX signal terminator.

Note!

If you use a controller with a 5 pin DMX output connector, you will need to use a 5

 

pin to 3 pin adapter. Chauvet Model No: DMX5M.

 

The chart below details a proper cable conversion:

 

3 PIN TO 5 PIN CONVERSION CHART

CONDUCTOR

3 Pin Female (output)

GROUND/SHIELD

Pin 1

DATA ( - )SIGNAL

Pin 2

DATA ( + ) SIGNAL

Pin 3

DO NOT USE

 

DO NOT USE

 

5 Pin Male (Input) Pin 1

Pin 2

Pin 3

Do not use

Do not use

Obey™ 40 User Manual

18

Revised: 2008-06-13 15:54:24

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Chauvet DMX512 user service Appendix, DMX Primer, Fixture Linking
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DMX512 specifications

Chauvet DMX512 is a widely used standard in the lighting industry, particularly in theatrical productions, concerts, and events. This protocol facilitates communication between lighting consoles and various lighting fixtures, streamlining the control of lights in a synchronized manner. Understanding its core features, technologies, and characteristics can significantly enhance the capabilities of any lighting designer or technician.

One of the main features of DMX512 is its ability to control multiple devices from a single controller. This is achieved by using a daisy-chaining method where up to 512 channels can be managed over a single network. Each channel can control various parameters of a lighting fixture, such as intensity, color, and movement. The flexibility of DMX512 allows lighting designers to create intricate shows with seamless transitions and effects.

Another crucial aspect of DMX512 is its robust technology that includes differential signaling. This aids in reducing signal interference and ensures that signals can be transmitted over long distances, making it ideal for large venues. The standard operates at a speed of 250 kbaud, providing reliable and fast communication between devices.

Additionally, DMX512 employs a 3-pin or 5-pin XLR connector, commonly found in both commercial and professional lighting systems. This standardization allows for ease of setup and compatibility with various equipment, enhancing the versatility of different lighting rigs.

One of the defining characteristics of DMX512 is its backward compatibility with older lighting technologies, making it an excellent option for venues transitioning from analog to digital controls. Its widespread acceptance means that users can access a plethora of lighting equipment designed to interact with DMX512, ranging from simple par cans to sophisticated moving head fixtures.

Moreover, DMX512 supports a variety of fixture types, including LED lights, fog machines, and intelligent fixtures. This versatility equips lighting designers with a diverse toolbox for creating dynamic visual presentations that can adapt to the needs of their specific projects.

In summary, Chauvet DMX512 is an essential protocol for any lighting professional, offering a combination of extensive control, reliability, and flexibility. Its compatibility with numerous lighting devices, robust signal transmission capabilities, and widespread usage make it a cornerstone of modern lighting design, ensuring that creators can bring their artistic visions to life efficiently and effectively.
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