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Output ports
Number of dimming channels4
Max load per dimming channel2.27A (500W at 220V)
Dimmer typeMOSFET
Supply voltage11.5...27.5 V DC from CAN
Dimentions4U, 69x102x58 mm


This module is designed for smooth adjustment of brightness of lighting devices (non reactive load). The dimmer type is MOSFET with trailing edge dimming. Like all Larnitech devices, this dimmer controller is automatically detected and configured when it is added to the system. A logical unit within makes it possible for the unit to perform scripts from Larnitech’s large and constantly updated database and to operate on distributed logic, ensuring the reliability of its operation. Advanced LED light settings allow a more precise setup, while soft start mode prolongs lamp life. In addition to featuring protection in a range of parameters.


  • R/C load type has 4 channels. Each channel supports up to 500 W, but the total load should not extend 1600 W
  • Works with halogen /LED lights
  • Advanced LED light settings
  • Soft start mode
  • Overload protection
  • Overheating protection
  • Short-circuit protection
  • Plug and play (automatically detected and configured by the system)
  • In-built logical unit
  • Regular system updates

CAUTION! All work related to the installation, connection, setting up, service and support must be carried out by qualified personnel with sufficient skills and experience in working with electrical equipment. To avoid the risk of fire, electric shock, damage to the system and/or personal injury, the system installation and assembly must be performed in accordance with the instructions listed below:

  • all connectivity work must be carried out with the power turned OFF;
  • use appropriate tools and personal protection against electric shock;
  • do not use damaged cables, wires and connectors;
  • avoid folding the cables and wires;
  • do not apply excessive force to the wires by kinking or pressing them too hard: the inner conductors of the cables and wires may get stripped or damaged;
  • do not use the power socket with poor contacts to connect;
  • do not exceed the load limit parameters specified in the manual;
  • the supply conductors wire section is subject to the specifications for current density limit, insulation type and wire material. Light section can result in cable overheating and fire.

When the power is on, NEVER:

  • connect/disconnect the connectors;
  • open modules and sensors.


DM04A VIEW.png

Example of connection

DM04A EXA.png

Module dimensions

DM04A DIM.png

Internal layout

DM04A IL.png

Module parameters

Parameter name Value
Input channels qty
0-10 input port quantity
LED Buttons
Number of sensor inputs
Number of dry contact inputs
RS485 ports qty
RS232 ports qty
UART ports qty
M-BUS port quantity
Pulse inputs quantity
DALI ports qty
DALI-line voltage supply
Peak current of DALI-line power supply
Peak current in DALI-line
Maximum DALI devices quantity
Dimming channels qty 4
Output channels qty
0-10 output port quantity
Analog output channels qty
Digital line maximum length
Discrete input channels qty
Digital input channels qty
Max power output audio channel
IR lighting
Card reader
Connection type
Backlight voltage
Load type
Supported sensors
Input voltage 100-240V AC, 50-60 Hz
Current type AC
Adjustment type
Max load
Min load
Max load per channel 2.27A (500W at 220V)
Max load per group
Max load per device 7.27A (1600W at 220V)
Control parameters
Angle of vision IR °
Angle of motion °
Temperature measuring range °C
Humidity measuring range
Dimmer type MOSFET
Dimming type trailing edge
Voltage that may be applied to the input channels 100-240V AC, 50-60 Hz
Max output switching voltage
Max output switching current
Power supply 11.5 … 27.5 V DC from CAN
Max current(24V) 35 mA
Max current(13V)
Max detection distance
Max IR distance
Max current
Data transfer speed
Permissible section of power supply cable to connect in socket:
Sensors VCC output
Sensors max VCC current
R1-R2 inputs max current
Push-button/reed switches line recommended length
Temperature sensor line max length
Sensor cable length
Sensors line max length
Bus type CAN (4-wire)
Compatible with
Output voltage
Output current
Equipment installation type DIN rail (EN 60715)
Max cabel lenght
Case material ABS
Protection IP40
Temperature range -10 … +50 °C
Size 4U, 69x102x58 mm
Weight 180 g
* -
** -
*** -
1 -
2 -
3 -

Supported load types

CAUTION! Do not overload the dimmer in order to avoid it overheating and breaking down. Use it safely by following the parameters provided in the parameters table. Only the kinds of load and load power options outlined in the compatible devices table are to be used with this dimmer.
Supported load type Power
Load1.png Conventional incandescent lamps 0-500W
Load2.png Halogen light sources 0-500W
Load3.png LED lamps with dimming support 0-500W
Load4.png Energy saving lamps with dimming support 0-500W
Load5.png Electronic ballasts with dimming support 0-500W

Indication of module operation

Indicator Status Description
Power Gl.png Power
E.png Power not available
Activity Y.png Data communication
E.png Data communication not available
Error E.png No errors
Rl.png Overheating
R.pngR.pngR.pngDots.png The data has not been transferred via the CAN bus for at least 5 minutes.
R.pngR.pngR.pngDots.png No power on the lamp.
R.pngR.pngR.pngDots.png No power on the DALI bus or over current (more then 180 mA) on DALI bus. If over current is at both bus blinking twice in half a second.

Module installation and connection procedure

  1. Install the module in the switchboard on the DIN rail and fix it with the special latch on the module base.
  2. Connect the CAN connector.
  3. Connect the contacts (1-4).
  4. Configure the module using LT setup.
  5. Apply power to the load.
  6. Check all equipment for proper operation.

Module shut-off and deinstallation procedure

  1. Disconnect the power from the load.
  2. Disconnect the contacts (1-4).
  3. Disconnect the CAN connector.
  4. Remove the module from the DIN rail, releasing the latch at the bottom of the module base.

Dimmer workflow


Linear, LED and Halogen workflows


HW settings

Name Type, range SUBID Default Description
dm char[4] 98 'LLLL' Each char is responsible for the type of a particular channel
  • 'g' – use like halogen dimer-lamp
  • 's' – Soft Switch, lamp, when on/off power is supplied/deenergised smoothly (500msec)
  • 'k' – Switch, lamp, when on/off power is supplied/deenergised immediately
  • 'l' – LED Function, dimmable LED lamps
  • 'v' – linear Function of dimming
  • '-' – Channel disabled
  • '+' – Regular channel

Example: dm='skl-'

def integer 0-250 1-4 100 The default brightness level in case of a power reset (1..250). Example: def=250
min integer 0-100 1-4 0 Minimum dimming level, example: min=10
max integer 0-100 1-4 100 Maximum dimming level, example max=95
start integer 0-100 1-4 0 The Start function is used for lamps that lack the minimal voltage to get turned on. If the set value is lower than the start value, the lamp is turned on at the start value and them the light is dimmed down to the set level. Example: start=60
force integer 0-100 1-4 10 Time duration of the starting value (measured in milliseconds). Example: force=20
runtime integer 0-60000 1-4 1000 Runtime is the speed of changing the brightness from 'min' to 'max' (measured in milliseconds). Example: runtime=1000
1<item addr="307:1" auto-period="600" cfgid="77" hw="def=200 min=30 max=88 start=35 force=20 runtime=1000 " name="Dimmer" type="dimer-lamp" uniq_id="51"/>
2<item addr="307:2" auto-period="600" cfgid="77" hw="min=20 max=90 " name="Dimmer" type="dimer-lamp" uniq_id="52"/>
3<item addr="307:3" auto-period="600" cfgid="77"  name="Dimmer" type="dimer-lamp" uniq_id="53"/>
4<item addr="307:97" cfgid="77" name="Temperature" system="yes" type="temperature-sensor" uniq_id="55"/>
5<item addr="307:98" cfgid="77" hw="dm='++--'" name="Temperature" system="yes" type="temperature-sensor" uniq_id="56"/>