3.2 DMX Communications

In the world of digital communications, information is sent using precise electrical voltage pulses. A positive voltage pulse represents a 1. A zero voltage pulse (or no voltage) represents a 0. Systems using 1’s and 0’s to encode information are called binary systems.

Each pulse in a digital signal is called a binary digit, or bit. A bit can only have one of two values, 1 or 0. A grouping of eight bits, called a byte, is used to carry one piece of information. This ‘information’ is simply a value ranging from 0 to 255.

The most common method of transmitting digital signals is to send data one bit at a time in one direction over one wire. Since each bit is transmitted in series, this method is known as Serial Communication. In its simplest form, Serial Communication requires one data wire for transmission and one common reference (or ground) wire.

There are two types of Serial Communication:

•Synchronous

•Asynchronous

In Synchronous data transmission, data is sent as a group of characters in a single stream of bits known as a bit- stream. For this method to work, timing devices at both ends must be in perfect synchronization, requiring precision equipment at a higher cost.

In Asynchronous data transmission, data is sent one byte at a time. Asynchronous devices do not require perfect synchronization, but their timing signals must be close (within about 5%). This method is relatively simple, and therefore inexpensive.

There are many standards for Serial Communications, each having its own advantages and disadvantages. Communications standards generally fall into two broad categories:

•Single-ended (unbalanced)

•Differential (balanced)

The single-ended specifications allow for data transmission from one transmitter to one receiver at relatively slow data rates and short distances. When communicating at high data rates, or over long distances in real-world environments, single-ended transmission methods are often inadequate. Differential data transmission offers superior performance in most applications by helping to nullify the effects of interference on the signal. This is achieved by using two wires to transmit the signal (with opposing polarity) instead of just one.

The DMX 512 protocol is based on the EIA/TIA-485 standard (commonly known as Recommended Standard 485 or RS-485), which uses asynchronous, differential data transmission. This standard supports 32 devices on one network at a distance of up to 4000 feet. One device functions as the master (the DMX controller) on a network, while the rest function as slaves (dimmers, intelligent fixtures, etc.). Only the master transmits over the network, and all slaves receive the same data.

3

www.elationlighting.com

11

Page 10 Page 12
Page 11
Image 11
Elation Professional DMX 101 manual DMX Communications
Page 10 Page 12

DMX 101 specifications

The Elation Professional DMX 101 is an innovative and essential tool for modern lighting control in various entertainment environments. Designed with both novice and expert users in mind, this compact yet powerful DMX controller brings a user-friendly interface along with advanced features that cater to a wide range of applications, including concerts, theatrical performances, and corporate events.

One of the standout features of the DMX 101 is its intuitive layout, which allows users to easily navigate through its functions. The controller includes numerous faders and buttons that enable quick access to control channels, making it simple to adjust lighting effects on-the-fly. The well-designed graphical display also provides real-time feedback, allowing users to monitor their settings without losing focus on the performance.

The DMX 101 is built around a robust technology framework that supports up to 512 DMX channels. This extensive channel support provides the flexibility needed for controlling many fixtures simultaneously, making it ideal for large lighting setups. Additionally, the controller boasts compatibility with a wide range of DMX devices, including moving heads, LED fixtures, and other intelligent lighting instruments.

One notable characteristic of the DMX 101 is its ability to store and recall multiple scene presets. This feature is particularly useful for events that require instant changes in lighting, enabling operators to create dynamic light shows with ease. The built-in sequencing capabilities further enhance this functionality, allowing users to pre-program complex light patterns and cues to be executed seamlessly during a performance.

Elation Professional has also integrated various creative effects into the DMX 101, such as color mixing, fading, and strobe effects. This versatility allows users to craft unique and visually captivating experiences that can elevate any event. Furthermore, the compact design makes the DMX 101 a portable solution, perfect for mobile DJs, event planners, and touring productions.

In summary, the Elation Professional DMX 101 is a comprehensive lighting control solution that combines ease of use with powerful features. Its intuitive design, extensive channel support, scene preset storage, and creative effects make it a valuable asset for any lighting professional looking to enhance their performances. Whether for a small gathering or a large-scale production, the DMX 101 stands out as a reliable and innovative tool, embodying Elation's commitment to quality and performance in the world of professional lighting.
Top Page Image Contents