Fixture Linking

You will need a serial data link to run light shows of one or more fixtures using a DMX 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.

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 fixtures 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 m (1640 ft)

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

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 Data Cable

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 must have the following characteristics:

Type:

shielded, 2-conductor twisted pair

Maximum capacitance between conductors:

 

30 pF/ft

Maximum capacitance between conductor and shield:

55 pF/ft

Maximum resistance:

 

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 3

2

1

3 OUTPUT

2

120 ohm ¼ W resistor between pin 2 (DMX -) and pin 3 (DMX +) on the output of the last fixture

To avoid signal transmission problems and interference, it is always advisable to connect a DMX signal terminator.

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.

5. Appendix

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Chauvet LED PAR 38-18B, LED PAR 38-18C user manual DMX Data Cable, Cable Connectors
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LED PAR 38-18B, LED PAR 38-18C specifications

The Chauvet LED PAR 38-18C and LED PAR 38-18B are advanced lighting solutions that cater to a wide array of applications, ranging from stage performances to architectural lighting. These energy-efficient LED fixtures are renowned for their vibrant color output, reliability, and versatility.

The PAR 38-18C model features 18 tri-color RGB LEDs, allowing for an extensive palette of color mixes. This capability ensures that designers can create vivid lighting effects that enhance any event or installation. The tri-color LED technology significantly improves color blending, eliminating the need for additional colored gels. With a high lumen output, these fixtures are perfect for illuminating larger spaces or providing accent lighting in smaller venues.

On the other hand, the LED PAR 38-18B features 18 ultra-bright blue and white LEDs, designed specifically for applications that require a cooler and more focused light output. This makes it an excellent choice for architectural accents or performances that prioritize a sharper, more piercing illumination. Both models maintain a robust construction that can withstand the rigors of touring and permanent installations alike, ensuring that they not only perform well but also last over time.

The Chauvet LED PAR 38 series utilizes advanced cooling technology to minimize heat generation, leading to extended lifespan and consistent performance over longer periods of operation. The fixtures also incorporate intelligent electronic circuitry that allows for flicker-free operation, making them suitable for video applications where high-quality imaging is essential.

For versatility, both models support several operating modes, including standalone, master/slave setups, and DMX control. This versatility allows lighting designers to create intricate lighting shows with ease, while also providing the option for simple operation in less complex scenarios.

Additionally, these fixtures are lightweight and come equipped with a variety of mounting options, making installation and repositioning quick and straightforward. Users can rely on Chauvet’s reputation for quality and performance, knowing that they are investing in products designed for the demands of modern lighting needs. The Chauvet LED PAR 38-18C and 38-18B truly embody the future of lighting technology, poised to elevate any visual experience.
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