The Easy Way to Distribute DMX / RDM from 
  Goddard Design Co.
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● Modules fit in standard wall boxes
● RDM/ DMX512 distribution
● Modules are full RDM hubs
● Fault isolation
● Relaxed networking rules
● Flexible controller placement
● Ideal for wire way and plug strip installation
● Fewer home runs
● Offers lower costs
● Optimised for 24 volt @ 38mA power supply

The RDM/DMX protocol combination is the first choice for bi-directional data delivery. DMX-Net RDM modules provide a flexible, cost efficient distribution method for those protocols. With most distribution systems, RDM requires that the controller be located only at one end of the network. If splitters are used, the controller is connected to the input on the first splitter. The DMX-Net RDM modules provide a much less restrictive distribution approach. Each of the modules acts as an RDM hub. Controller placement is flexible because input modules can be placed at any point on the network.

In many installations DMX-Net RDM allows you to configure a RDM distribution system without using patch panels or complicated routing switchers. Use DMX-Net RDM coupled with other technology nodes (like DMX over Ethernet) to multiply the number of outputs at reasonable cost.

DMX-Net RDM discourages excessive daisy-chaining, making fault isolation easier, and time to repair shorter. Instead of one DMX outlet in the FOH slot, put in four or five; a damaged cable will disable only a few color scrollers instead of every FOH unit. Install an input and then take your DMXter4 with you, for easier trouble shooting.

Photo of modules

Unlike systems using passive wall plates, the DMX-Net RDM user doesn’t need to know the hidden wiring topology. Each output provides a galvanically isolated RDM controller port with a guaranteed full strength signal. There are no hidden stubs. No other outlets with unterminated or over terminated cables to cause reflections. Ground loops are controlled. Radio frequency grounding is stable, unlike with ad hoc portable splitters.

The system consists of two types of RDM modules, one for input and one for output. They are fitted with Neutrik connectors and can fit in a single gang box. They are ideal for use in low voltage chambers of power battens and truss wire ways. 

Each module has a bi-color tally LED. The LED indicates the status of each module - is it powered and available, is it inputting or outputtng data, or is there a fault condition.?

Each module is connected by a two piece screw terminal connector to a private RDM distribution bus. The bus provides a DMX/RDM pair, power, power common, and shield. All modules include a terminator for the private bus; the ones at the ends of the bus are enabled during installation. If required the private bus may have branches (star topology). This requires adding a branching module for each branch.

The low cost of the hardware and installation of DMX-Net RDM will allow more RDM ports, more flexibility, and greater fault isolation. Even in systems using DMX512 alone, DMX-Net RDM allows the creation of flexible networks that are impossible to achieve with any standard splitter topology.

A White Paper on Using DMX-Net RDM  to save costs in moderate to large theatre spaces can be found  here white paper 1

A White Paper on Using DMX-Net RDM  to save costs in a black box theatre space can be found  here  white paper 2
Input module: FN RDM_MOD IN $235.
Output module:
FN RDM_MOD $240.
Cover plate: FN 1GSS $20.
For delivery within NY state add applicable sale tax.
Systems optimised for 24VDC power supply @ approx. 38mA per module.

Goddard Design Company
51 Nassau Ave.
Brooklyn NY 11222 USA
718 599-0170 718 599-0172 fax


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last updated July 15,2022

line drawing of modules with Dim.

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