Series 3 LumenDim User Manual

This is the RC4 User Manual for:

RC4 Series 3 LumenDim4 (500W 4-Channel)
RC4 Series 3 LumenDimM4 (Small 4-Channel)
RC4 Series 3 LumenDimM2 (Small 2-Channel)
RC4 Series 3 LumenDimM2Micro (Circuit Board Module)

RC4 Wireless Dimming

If you are unsure about what wireless dimming is used for, explore expert examples with pictures and information at  Highlights include The Rockettes, Katy Perry, Wicked – The Musical, The Who’s Tommy, and much more.

Tutorial videos to help you use and understand RC4 technology are available at  Seeing the process is sometimes easier than reading a manual.

The RC4 Series 3 User Interface

For a detailed outline of RC4 Series 3 buttons, LEDs, and user interface nomenclature, see:


LumenDimM2micro Circuit Board Module (No Case)

The LumenDimM2micro is the smallest dimmer in the RC4 LumenDim family.  The buttons are not recessed behind holes because, of course, there is no case.  The buttons are right there, on the edges of the circuit board.

For this reason, it is important to mount the LumenDimM2micro so that accidental button presses will not occur.  If a button is pressed during power-up or while operating, it will most likely cause a configuration change.

When LumenDim buttons and indicators are referenced in this document, here is where they are on the LumenDimM2micro:


In all other respects, operation is exactly the same.  There are only two dimmers.  References to SetC and SetD buttons, and DimC and DimD indicators, do not apply and can be ignored.  Feature and functions that are selected using the SetC and SetD are not available on the LumenDimM2micro.

Restore Defaults

If you are unsure of the settings in an RC4 Series-3 device, or if it is not responding as expected, you can restore default settings at any time:
Hold the recessed Func button while you press and release the SetA recessed button.  The DimA indicator will blink, and most settings will be cleared to defaults.   Some firmware versions leave the PWM frequency and RC4 Digital PersistenceTM setting unchanged after loading defaults.

To restore original factory settings including PWM frequency and Digital Persistence:
Hold both the Func and the SetA buttons while powering on the device, and hold them for more than 5 seconds.  The COP indicator will light for 5 seconds in bootloader mode before reverting to normal operation.  Hold the two buttons for this entire time.

Restoring defaults is easiest with two bent paperclips, one for each button.

DMX Controller and Transmitter

RC4 Wireless devices are DMX controlled.  You need a DMX controller (sometimes called a DMX Console, or a DMX Desk) to get started.  If you’re setting up in a theatre space, you probably have a DMX controller in the lighting booth.

Next, you need a CRMX transmitter.  It doesn’t have to be a Lumen Radio transmitter, but it must transmit the Lumen Radio CRMX wireless protocol.  A list of compatible brands – and there are many – can be found at

At the time of this writing, Lumen Radio receivers, including RC4 LumenDim devices, are also compatible with Wireless Solution W-DMX transmitters, but without wireless RDM (remote device management) support.

Be sure your transmitter sends Lumen Radio CRMX or Wireless Solution W-DMX data.


Make the DMX Connection

Connect a DMX data output from your DMX controller to the DMX data input on your wireless DMX transmitter.  Be sure your transmitter is powered on and operating.  In most cases, that’s all you need to do.  Your DMX universe will now be out on the airwaves. 

Battery and Dimmer

RC4 Series 3 dimmers have a wide voltage input range: 6V – 35VDC.  Connect a battery or DC power supply within this range to the Vin terminals and the device will power on.

All RC4 Wireless DC power inputs are protected against reverse polarity.

If you connect the battery backwards, no status indicators will come on, but one or more dimmer channels may be fully on.  Do not leave a dimmer in this state for extended periods. 

It is difficult to protect dimmer circuits from power connected to the output terminals.  Do NOT do this!  Connect your battery or power supply ONLY to the Vin terminals.

Each RC4 dimmer has an output indicator, so you don’t need to connect anything more to see things work right away.

Pairing Receivers with Transmitters

RC4 LumenDim devices must be paired with a compatible transmitter before they can be used wirelessly.  The transmitter must send CRMX or W-DMX data.

RC4 Series 3 dimmers use small recessed pushbuttons that cannot be accidentally pressed when the device is inside a prop, set piece, or costume.  You will need a bent paperclip or other small tool to operate these buttons.

Buttons are behind short slotted openings.  LEDs are behind small round holes (not slots).  Do not poke anything into the round holes.  Only insert your tool into slotted openings.

Follow these simple steps:

  • Ensure that the transmitter and the LumenDim device are powered on and near each other.
  • If the LumenDim was previously paired to a different transmitter, press and hold the recessed RF Connect button on the dimmer for at least 5 seconds. The blue RF Connect indicator should go off (not on, and not blinking).
  • Press the Link button on the transmitter (depending on the make and model, this transmitter button might be marked as Function or Connect). An indicator on the transmitter will start flashing.  The blue RF Connect indicator on the LumenDim will also start flashing.
  • While indicators are flashing, briefly press (do not hold) the RF Connect button on the LumenDim. When the transmitter stops flashing, the blue RF Connect indicator on the LumenDim will remain lit, indicating that pairing is complete.
  • If DMX data is supplied to the W-DMX transmitter, the yellow DMX indicator on the LumenDim will be on.
When the yellow DMX data indicator is on, you have DMX control of your wireless dimmers.

The LumenDim will remain paired to the same transmitter until it is changed using the same procedure with a different transmitter.  Consult Lumen Radio CRMX documentation, or documentation for the transmitter you are using, for additional information.

Make Something Light Up!

On your DMX controller, fade DMX channels 1, 2, 3, and 4 up and down (or just 1 and 2 if you are using a 2-channel dimmer).  You will see the DimA, DimB, DimC, and DimD indicators on your LumenDim device fading up and down on command, in real-time.

Assign DMX Channels

You probably don’t want to run all your wireless dimmers on DMX channels 1 through 4. RC4 OneTouchTM makes it easy to assign any DMX channel and dimmer curve to any dimmer with a single press of a single button.  You need a working DMX controller and transmitter, a LumenDim that has been paired to your transmitter, and a bent paperclip or other small tool for pressing small recessed buttons.

The yellow DMX Data indicator on the LumenDim must be on.  If it is not on, then DMX data is not present at your transmitter or you have not properly paired your devices.

Start by clearing all your DMX channels to zero on your controller.  Be sure this includes any “special” channels, like house lights and work lights, and be sure you are not using fixture profiles that “home” some channels at levels other than zero.  For example, some moving light fixture profiles will send X and Y motion to a midpoint when the console is “cleared.”   That midpoint is not zero; for our purposes, you need actual zero.

If you are unsure if all channels are really at zero, check your DMX line with a tester, like a Goddard DMXter or a Fleenor Gizmo.  These are very handy devices to have around for many reasons.  Put this on your wish-list!

Now, bring up the level of one DMX channel – any channel you like – to 30% (if you can’t decide on what channel to try, use channel 92).  If you’re using a simple fader, put it about 1/3 of the way up.  If you can type in a channel level, use 30%.  Now, go to your LumenDim and press the SetA button.  You’ll see the DimA indicator come on at about 30% brightness.  When you let go of the button, the dimmer should stay on.  It is now assigned to the channel you have up.

Fade the channel up and down from your DMX controller.  The wireless dimmer will track it exactly.  It will remember your channel assignment after you cycle the power.  It remembers forever, until you change it.

If the dimmer came on brightly when you pressed the button, and did not stay on after you released the button, the data connection to the transmitter is not working.  Go back to the previous steps and get it working with default settings for wireless control on DMX channels 1, 2, 3, etc.

Setting the channel to 30% tells the dimmer to use a combination of options that make LEDs look great, ideal for viewing the little indicator on the dimmer device itself.

You can set the channel to levels other than 30% to select configurations that are optimized for other kinds of loads.  Each dimmer can be set to a channel, curve, PWM frequency, and RC4 Digital Persistence level, accommodating the different needs of multiple loads connected to the same device.

More LumenDim Details

Review other articles in the LumenDim section of this Knowledge Base for more details on:


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