DMX, short for Digital Multiplex, is currently the world’s most popular standard for controlling dynamic lighting, providing one-way communication from a DMX controller to receivers, such as lighting fixtures. It allows for connecting up to 32 devices in a daisy chain, and thanks to the use of signal amplifiers or DMX line splitters, it is possible to build extensive installations with almost any topology. The standard supports simultaneous control of 512 channels within a range of 0–255 (0–100% brightness).
In practice, lighting fixtures and other DMX-compatible devices have a unique, programmable address. They are connected via a special bus used to transmit digital control signals. Electronic control circuits, known as drivers, which are integrated into the fixtures or function as external devices, interpret the control signal and work with the light source to transform it into the desired lighting effect. A major advantage of this protocol is its speed and the ability to synchronize devices, ensuring that all fixtures operate in perfect unison.
DMX technology is widely used in stage and special effects lighting. However, it is also very popular for controlling multicolor lighting, such as architectural lighting. Modern advanced DMX controllers offer nearly unlimited possibilities for programming scenes and lighting sequences. They allow you to trigger events using external signals and even convert music tracks into automatic lighting sequences in real time.
If you want to create unforgettable lighting effects using DMX technology, contact us and find out how we can help you bring your project to life.
RDM (Remote Device Management) is an extension of the DMX512 protocol. It enables two-way communication over a standard DMX line, allowing for the addressing and monitoring of DMX devices without interfering with the operation of devices that do not support RDM.
6-channel DMX/RDM driver
Problem:
Design of a cost-effective PWM driver, powered by a DC voltage, supporting at least 4 PWM channels with the highest possible load capacity, operating in the DMX512 system with RDM functionality.
Solution:
The selection of a DIN rail enclosure and convenient spring-loaded connectors, which not only allow for easy connection and disconnection of large-gauge cables but also enable the connector to be quickly disconnected from the controller without unplugging the cables. The design allowed for programming functions via the DMX bus or the built-in USB port, and for selecting the operating mode and setting an individual address via the DMX bus or the built-in DIP switch. Support for 6 control channels with a 5A load capacity, which was a significant competitive advantage and a value proposition for the target audience. Supply voltage – any value within the range of 12–48 V DC. Redundant programming and configuration options, operating modes with the DMX bus enabled or disabled, including built-in (predefined) modes.
Main description:
Here, we had to meet expectations regarding the price per control channel and the power capacity of both individual channels and the controller as a whole. The building automation market is highly competitive, and installers choose devices that are not only user-friendly and easy to install, but above all offer excellent value for money. We have implemented full support for the DMX512 bus standard along with bidirectional RDM communication, which enables device configuration as well as service and diagnostic functions. 16-bit control resolution ensures very smooth changes in brightness. This parameter, as well as the selection of the dimming curve, refresh rate, and full device configuration, are accessible via a PC application through the USB port built into the device. The device allows, among other things, setting channel balance and defining the response to DMX signal loss.
The controller’s architecture supported 6 PWM channels, which could be combined both hardware- and software-wise. This way, we could obtain 1 to 6 channels with a total load capacity of 30A, which, with a common 24V DC power supply, offers as much as 720W of power. Thanks to software bridging, the system also recognizes the controller as a device with 1 to 6 control channels.
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