DMX Overview
What is DMX?
DMX, short for digital multiplexing, is a standard for digital
communication which is commonly used in lighting for theatrical
venues. It is used to link controllers, dimmers, lights, and other
devices for increased control. In the DMX protocol, up to 512
bytes (or data slots) are sent repeatedly from a controller, and the
devices connected use the predefined data slots assigned to them
to control light output, servos, etc.
Each Ephesus DMX-compatible fixture contains a special control
box to enable this functionality. Generally, each box (and its
associated light) will have a unique address (also known as a start
slot) in the venue’s DMX-connected lighting array. This address is
set and stored in each fixture, allowing each light to be controlled
independently. The number of slots used by each light fixture can
and does vary; Ephesus fixtures use between one and four data
slots of the 512 available in a DMX universe. However, some lights
may have the same address if users wish to control different lights
in the same manner at the same time.
DMX controller on an Ephesus Arena fixture
Why would I want DMX in my venue?
The Ephesus DMX system is desirable if you want some control over the lighting in your venue. In addition to
providing on/off and dimming options, this DMX system can integrate with other controllers or equipment in
the venue. Also, if the venue is already wired for DMX, installing Ephesus fixtures with DMX functionality may
be especially attractive.
DMX is also advantageous if the venue is used for a variety of sports and activities. For example, hockey and
basketball have different lighting requirements and preferred color temperatures. DMX functionality allows
operators to adjust these parameters at the push of a button. Alternate lighting, such as lower intensity work
lighting, can be operated through DMX when the full sports lighting is not required.
How do the Ephesus fixtures connect to DMX?
We can outfit fixtures with RJ-45 sockets or XLR panel connectors.
For a new installation, we recommend using the RJ-45
connections, which are more easily installed and usually less
expensive than XLR connectors. Please note there are ordering
codes for each option.
For installations where new data cable is required, we
recommend CAT 5e and CAT 6 cable, which have been shown to
be reliable and are among the most affordable types of data cable
available. Variations are available.
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It is possible to connect wired DMX using the Ephesus EDCs (end device controllers). Two fixtures connect to
each EDC and the DMX cable connects to the EDC to control the lights. With the use of only one repeating
controller, we can operate over 300 fixtures in a venue.
The Ephesus fixtures should be universally compatible with any DMX controller. However, if there is a
question about compatibility, please contact Ephesus for verification.
What about RDM functionality?
The Ephesus fixtures do not currently have RDM functionality built into them to allow for two-way
communication. However, some of this functionality is available when used in conjunction with our optional
wireless control system.
Are there drawbacks to DMX?
It depends on your needs and perspective. The main drawback is that DMX requires control wires that are
often not in place in venues with legacy metal-halide lighting systems. Additionally, DMX offers only one-way
communication; that is, it will only issue commands to the lights. There is currently no option for two-way
communication (RDM DMX), which is helpful to monitor the health/status of individual lights or to integrate
options such as occupancy or daylight sensing.
Are there alternatives to DMX?
Yes. Ephesus offers a wireless lighting control system as well. Depending on your needs, this may be better and
it allows for more customization. Specifically, the wireless system offers two-way communication with the
fixtures, so you know if a light is malfunctioning. In venues where wiring is not already in place for DMX
control, wireless control is often more economical than the material and labor costs of control wire
installation. Furthermore, the Ephesus wireless system allows for the creation of custom lighting effects for
enhanced fan experience.
Is this a proven solution?
Yes! Ephesus Lighting installed its Arena lights with DMX controls at the UMass Mullins Center. This system
easily integrated with equipment already in the venue to generate different sports-specific lighting scenes and
effects. A video showing it in use may be seen here:
https://www.youtube.com/watch?v=1WkNQ2vh31k&feature=youtu.be
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