Fixture Linking

You will need a serial data link to run light shows of one or more fixtures using a DMX-512 controller or to run synchronized shows on two or more fixtures set to a master/slave operating mode. The combined number of channels required by all the fixtures on a serial data link determines the number of fixtures the data link can support.

Important: Fixtures on a serial data link must be daisy chained in one single line. To comply with the EIA-485 standard no more than 32 devices should be connected on one data link. Connecting more than 32 fixtures on one serial data link without the use of a DMX optically-isolated splitter may result in deterioration of the digital DMX signal.

Maximum recommended serial data link distance: 500 meters (1640 ft.)

Maximum recommended number of fixtures on a serial data link: 32 fixtures

Data Cabling

To link fixtures together you must obtain data cables. You can purchase CHAUVET-certified DMX cables directly from a dealer/distributor or construct your own cable. If you choose to create your own cable please use data-grade cables that can carry a high quality signal and are less prone to electromagnetic interference.

DMX DAT A C ABLE

Use a Belden© 9841 or equivalent cable which meets the specifications for EIA RS-485 applications. Standard microphone cables cannot transmit DMX data reliably over long distances. The cable will have the following characteristics:

2-conductor twisted pair plus a shield

Maximum capacitance between conductors – 30 pF/ft. Maximum capacitance between conductor and shield – 55 pF/ft. Maximum resistance of 20 ohms / 1000 ft.

Nominal impedance 100 – 140 ohms

CABLE CONNECTORS

Cabling must have a male XLR connector on one end and a female XLR connector on the other end.

DMX connector configuration

 

 

COMMON

 

1

DMX +

INPUT

3

 

 

2

DMX -

 

 

 

1

Resistance 120

 

ohm 1/4w

 

3

 

between pin 2

 

2

 

(DMX -) and pin

 

 

 

 

3 (DMX +) of the

1

 

last fixture.

OUTPUT

 

3

 

2

Termination reduces signal errors. To

avoid signal transmission problems

 

 

and interference, it is always

 

advisable to connect a DMX signal

 

terminator.

CAUTION Do not allow contact between the common and the fixture’s chassis ground. Grounding the common can cause a ground loop, and your fixture may perform erratically. Test cables with an ohm meter to verify correct polarity and to make sure the pins are not grounded or shorted to the shield or each other.

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Chauvet DMX512 user manual Fixture Linking, Data Cabling, Dmx
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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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