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Doug Fleenor Designs 123
1x3 DMX Isolation Amplifier And Splitter

OUR PART #:  123

The Doug Fleenor Design 123 DMX splitter offers three outputs from a single DMX input.
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Selected Model Price: $492.48
List Price: $608.00
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Doug Fleenor Designs 123
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The Doug Fleenor Design 123 DMX splitter offers three outputs from a single DMX input. Each output is electrically isolated from the input, and from every other output, by 2500 volt optical couplers. Each output has its own line driver and associated power supply.

The DMX splitter allows connection of DMX receivers (dimmers, color changers, moving lights, etc.) in a star configuration as opposed to a daisy chain configuration. In a star configuration, each control cable is run to a central point, in this case the splitter. In a daisy chain configuration all the devices are connected on one control cable, the output of one feeding the input of the next. It is not good practice to simply split a DMX control cable using a "wye" cable as this can cause signal corruption due to reflections. Typical uses of the splitter include splitting the control signal between stage right and stage left dimmers, running an isolated split to a string of color changers, splitting and isolating a feed to a wall outlet for temporary or rented dimmers, isolating a stack of dimmer packs from each other, etc.

Doug Fleenor Design 123 Specifications:

  • Input circuit: EIA-485 receiver with 120 ohm termination resistor between +Data and -Data (Units with feed through connectors do not have internal termination)
  • Input signal: 0.2 volts minimum, 12 volts maximum
  • Output circuit: EIA-485 driver
  • Connectors: Gold-plated 5-pin Neutrik D-1 Series (3-pin connectors, terminal blocks, or RJ45 connectors optional)
  • Feed through: A non-isolated feed through connector is optional
  • Isolation: 2500 volt optical coupler, 1500 volt split bobbin transformer
  • Power input: 100 - 120 volts, 50/60 hertz, 12 watts (208 - 240 volt optional )
  • Color:
    • Top, bottom and sides: Silver hammer tone
    • Front and back: Black
  • Dimensions (DxHxW): 6.5" x 1.7" x 6.5"
  • Weight: 2.6 lbs

NOTE: All Specifications Meet or Exceed DMX512 Requirements

DMX512 Isolated Splitter -- Selected Features:

The following information is provided to assist you in determining if the DMX512 Isolated Splitter would be of benefit in your installation.

  • Feature: Inputis electrically isolated from output.
    Benefit: Console is protected from failed dimmers, lightning damage, and any other cause of high voltage on the control cable.
  • Feature:Outputs are isolated from each other.
    Benefit: Color changers, moving lights, other dimmers are protected from each other.
  • Feature:Outputs are separately buffered.
    Benefit: Reflections, short circuits, etc. on one output cannot affect another output.
  • Feature: Nousera djustments.
    Benefit:Easy "fool proof" installation.
  • Feature: DMXpinouts are printed on the splitter.
    Benefit: Assists in proper control wiring.
  • Feature: Powdercoated 1/10" aluminum chassis.
    Benefit: Rugged and attractive for years of service.
  • Feature:Gold-plated Neutrik 5-pin connectors.
    Benefit: Assures reliable connections.
  • Feature: Allintegrated circuits are socketed.
    Benefit: Eases field service.
  • Feature: Uses2500 Volt optical couplers.
    Benefit: Easily isolates line voltage failures. Usually withstands electrical storm damage.
  • Feature: Fortytimes faster than DMX data rate.
    Benefit: Reliable, high speed data throughput. Units can be cascaded.
  • Feature: "Airgap" circuit board under isolator.
    Benefit: Prevents arcing across circuit board.
  • Feature: 60 mA drive current.
    Benefit:Reliably drives long control cables.
  • Feature: Powerand input signal indicators.
    Benefit: Simplifies system trouble shooting.
  • Feature: Mr.Fleenor is active in ESTA, PLASA, and USITT.
    Benefit: Products are designed to latest specifications.
  • Feature: 5 year warranty.
    Benefit:Peace of mind.

Isolation of the console from the dimmers is desirable because device failure in one of the dimmers can place damaging voltages on the control cable. Without an isolator between the dimmers and the console, this voltage can cause extensive damage to the console's microprocessor circuits. With an isolator in place, damage, if any, is restricted to the isolator. Electrical storms can also induce damaging voltages on control cables. Barring a direct strike to the system, Doug Fleenor Design Isolators effectively protect against storm damage.

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