DMX Primer, Fixture Linking Daisy Chain

DMX Primer

There are 512 channels in a DMX connection. A fixture capable of receiving DMX 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 all respond exactly the same.

DMX fixtures are designed to receive data through a 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 DMX data 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+).

Fixture Linking (Daisy Chain)

You will need a daisy chain 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 daisy chain determines the number of fixtures the data link can support.

To comply with the EIA-485 standard, do not connect more than 32 fixtures on one daisy chain. Connecting more than 32 fixtures on one daisy chain without the use of a DMX optically-isolated splitter may result in deterioration of the digital DMX signal.

Maximum recommended cable distance: 500 m (1640 ft)

Maximum recommended number of fixtures on a daisy chain: 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

5. Appendix

10/25/2010 10:23 AM

SCAN LED 300 specifications

The Chauvet SCAN LED 300 is a cutting-edge mirror scanner designed to elevate the performance capabilities of lighting professionals and event designers. Combining advanced LED technology with versatile features, this lighting fixture is ideal for clubs, concerts, and various live events.

One of the standout features of the SCAN LED 300 is its powerful LED source. Capable of producing bright and vivid colors, the fixture utilizes high-efficiency LEDs that ensure longevity and low power consumption. This not only results in a lower carbon footprint but also reduces the costs associated with frequent bulb replacements common in traditional lighting systems.

In terms of performance, the SCAN LED 300 offers a wide array of color options and effects. With a comprehensive color wheel featuring multiple hues, operators can depict dynamic visuals that captivate audiences. The built-in effects and gobo patterns further enhance its capabilities, allowing for customizations that fit the specific ambiance of any venue.

Control is seamless with various operation modes available on the SCAN LED 300. It can be operated in standalone mode or controlled via DMX, granting users versatility in programming and automation. For ease of use, the fixture features a digital display for quick access to settings and menu scrolls, making adjustments straightforward on the fly.

Adding to its user-friendly attributes, the Chauvet SCAN LED 300 is designed with a lightweight and compact structure, making it easily transportable for touring professionals. Its rugged construction is also built to withstand the rigors of frequent travel while ensuring long-term reliability.

The fixture’s pan and tilt movement ensures expansive coverage, providing the ability to create sweeping light patterns across large areas. With its 180-degree pan and 90-degree tilt capabilities, the SCAN LED 300 can be used to produce impactful light shows that resonate well with audiences.

In summary, the Chauvet SCAN LED 300 is an exceptional lighting fixture that integrates advanced technologies with practical features. Its efficient LED source, operational versatility, and robust design make it a preferred choice for lighting professionals looking to push the boundaries of creativity in their productions. Whether for intimate gatherings or grand performances, the SCAN LED 300 stands out as an essential tool in modern event lighting.