How much power can the GPT-1803_C10 decoder handle?

Each of its 3 channels delivers up to 5 A. In total it handles 75 W at 5 V, 180 W at 12 V and 360 W at 24 V. To keep a safety margin, we recommend staying below 80% of that load and choosing a power supply at least 20% above the LED consumption.

What kind of LED lighting can it control?

It is designed for constant voltage common-anode (common positive) RGB LED strips and modules from 5 to 24 V DC. It can also drive three independent single-colour circuits, one per channel, from the DMX console.

How do I set the DMX address?

With the 10-way DIP switch. Switches 1 to 9 add their binary value (1, 2, 4, 8, 16, 32, 64, 128 and 256) when set to ON. For example, 1 + 4 + 32 = address 37. The decoder uses that address and the next two (R, G and B). Switch 10 (FUN) must be OFF to receive DMX signal.

Can I test the installation without a DMX console?

Yes. With switch 10 (FUN) set to ON it enters test mode: switches 1 to 7 show red, green, blue, yellow, purple, cyan and white; switch 8 starts the 7-colour jump and switch 9 the smooth fade, with 8 selectable speeds.

Which address should I give each decoder when I install several?

Add 3 to the previous address, because each GPT-1803_C10 uses 3 channels: the first at 1 (switch 1), the second at 4 (switch 3), the third at 7 (switches 1, 2 and 3), and so on. The highest usable start address is 510. Decoders that share an address show the same colour at the same time.

In test mode, what happens if several switches are ON?

The highest-numbered switch always wins. With switch 8 (jump) or 9 (fade) ON, switches 1 to 7 set the speed: all OFF is speed 0 and the highest one ON gives the speed, from 1 to 7. For example, FUN, 9 and 7 ON means a 7-colour fade at speed 7.

How many decoders can I connect on one DMX line?

Up to 32 decoders per line. Beyond that you need a DMX signal amplifier (never more than 5 amplifiers in a row). On long runs or with low-quality cable, fit a 90-120 Ω, 0.25 W terminating resistor at the end of the line.

What warranty and delivery time does it have?

It comes with a 3-year GP Trader warranty and ships from our warehouse in Spain. Returns are accepted within 30 days of receipt, provided the product is unopened and in its original packaging.

DMX512 RGB Decoder 3 channels 5A 5-24V – GPT-1803_C10

Name: DMX512 RGB Decoder 3 channels 5A 5-24V – GPT-1803_C10
Brand: GP Trader
SKU: GPT-1803_C10
Price: 23.59 EUR
Availability: InStock

GPT-1803_C10 3-channel 5 A DMX512 RGB decoder, two units with XLR and RJ45 ports, green terminal block and XLR plugs — Two GPT-1803_C10 decoders on a white background: one shows the DMX512 input and output on XLR and RJ45, the other the green RGB output terminal block and red address DIP switch. In front, male and female XLR plugs.

GPT-1803_C10 3-channel 5 A DMX512 RGB decoder, front view with green 8-way terminal block and red 10-position DIP switch — Real photo of the decoder on a steel workshop table. The black housing shows the DMX512 DECODER, DC5V-24V and 5A×3CH print, the green screw terminal block for power and RGB outputs, and the red DIP switch with values 001 to 256 plus FUN to set the DMX address.

GPT-1803_C10 DMX512 decoder dimension drawing: 125 × 52 × 40 mm, with XLR and RJ45 DMX ports and RGB output terminal block — Dimensioned drawing with three views: DMX side with RJ45 DMX IN/OUT and XLR DMX512 IN/OUT (1 GND, 2 DMX−, 3 DMX+); output side with DC+, DC−, CH1, CH2, CH3 and V+ terminals beside the 10-position DIP switch; and a 52 mm side view with two mounting holes.

GPT-1803_C10 DMX512 decoder wiring diagram with a DMX console or controller, two daisy-chained units and RGB LED strips — The DMX signal comes from a computer with a USB-DMX converter, a DMX512 controller or a DMX512 console. The first decoder receives it on its input and passes it to the next via its output; each unit is powered at 5-24 V DC and drives its own RGB LED strips.

Specifications reviewed: November 3, 2026

Constant voltage DMX512 decoder with 3 PWM channels at 5 A for 5-24 V DC RGB LED strips and modules. Up to 360 W at 24 V, 256 levels per channel, XLR-3 and RJ45 connectors, DIP switch addressing and test mode without a DMX console.

23.59 € (VAT incl.) per unit SKU: GPT-1803_C10 In stock

Measurement diagram

Technical specifications

Reference	GPT-1803_C10
Device type	Constant voltage (CV) DMX512 decoder
Input signal	DMX512 / DMX512 (1990)
Supply voltage	5-24 V DC (automatic adaptation)
Output channels	3 constant voltage PWM channels (R, G, B)
Current per channel	5 A (15 A in total)
Total power	75 W (5 V) / 180 W (12 V) / 360 W (24 V)
Dimming levels	256 levels per channel (0-255)
Load type	Common-anode RGB LED (common V+) or 3 single-colour circuits
DMX addresses used	3 consecutive (start address 1-510)
DMX addressing	10-way DIP switch (1-9 address, 10 function)
DMX connectors	XLR-3 in/out and RJ45 in/out
Output connector	6-pole terminal: DC+, DC−, CH1, CH2, CH3, V+
Test mode	7 static colours, 7-colour jump and fade, 8 speeds
Memory	Restores the last state after a power cut
Housing	Metal with fixing tabs, IP20 (indoor use)
Dimensions	125 × 52 × 40 mm
Packaging	140 × 77 × 47 mm · 320 g
Certifications	CE, FCC, RoHS
Warranty	3 years

Frequently asked questions

How much power can the GPT-1803_C10 decoder handle?: Each of its 3 channels delivers up to 5 A. In total it handles 75 W at 5 V, 180 W at 12 V and 360 W at 24 V. To keep a safety margin, we recommend staying below 80% of that load and choosing a power supply at least 20% above the LED consumption.
What kind of LED lighting can it control?: It is designed for constant voltage common-anode (common positive) RGB LED strips and modules from 5 to 24 V DC. It can also drive three independent single-colour circuits, one per channel, from the DMX console.
How do I set the DMX address?: With the 10-way DIP switch. Switches 1 to 9 add their binary value (1, 2, 4, 8, 16, 32, 64, 128 and 256) when set to ON. For example, 1 + 4 + 32 = address 37. The decoder uses that address and the next two (R, G and B). Switch 10 (FUN) must be OFF to receive DMX signal.
Can I test the installation without a DMX console?: Yes. With switch 10 (FUN) set to ON it enters test mode: switches 1 to 7 show red, green, blue, yellow, purple, cyan and white; switch 8 starts the 7-colour jump and switch 9 the smooth fade, with 8 selectable speeds.
Which address should I give each decoder when I install several?: Add 3 to the previous address, because each GPT-1803_C10 uses 3 channels: the first at 1 (switch 1), the second at 4 (switch 3), the third at 7 (switches 1, 2 and 3), and so on. The highest usable start address is 510. Decoders that share an address show the same colour at the same time.
In test mode, what happens if several switches are ON?: The highest-numbered switch always wins. With switch 8 (jump) or 9 (fade) ON, switches 1 to 7 set the speed: all OFF is speed 0 and the highest one ON gives the speed, from 1 to 7. For example, FUN, 9 and 7 ON means a 7-colour fade at speed 7.
How many decoders can I connect on one DMX line?: Up to 32 decoders per line. Beyond that you need a DMX signal amplifier (never more than 5 amplifiers in a row). On long runs or with low-quality cable, fit a 90-120 Ω, 0.25 W terminating resistor at the end of the line.
What warranty and delivery time does it have?: It comes with a 3-year GP Trader warranty and ships from our warehouse in Spain. Returns are accepted within 30 days of receipt, provided the product is unopened and in its original packaging.

GPT-1803_C10 DMX512 decoder: 3 RGB channels at 5 A for LED strips and modules

The GPT-1803_C10 is a constant voltage DMX512 decoder that turns the signal from a lighting console, DMX controller or PC software into three independent 5 A PWM outputs. It brings 5, 12 or 24 V DC RGB LED strips and modules into a professional DMX installation, with 256 dimming levels per channel and quick addressing by DIP switch.

Where it fits

RGB signs and light boxes that must stay in sync with the rest of the lighting in a venue or event.
Indoor architectural lighting: bars, clubs, hotels, shop windows, retail spaces and showrooms.
Stages, studios and exhibition stands where the DMX console controls each colour zone separately.
Three independent single-colour circuits (for example, three zones of white strip) dimmed from the same console.

How much LED strip or how many LED modules you can connect

Each channel delivers up to 5 A, so the maximum power depends on the supply voltage. To keep the decoder cool and leave headroom, size the load at 80% of its capacity.

Diagram: allowed load of the GPT-1803_C10 DMX decoder at 5, 12 and 24 V, with RGB LED modules split into parallel lines of max. 20

Allowed load of the GPT-1803_C10 decoder by supply voltage
Voltage	Maximum power	Recommended load (80%)	Load example
5 V DC	75 W	60 W	≈ 4 m of 14.4 W/m RGB strip
12 V DC	180 W	144 W	≈ 200 × 12V 0.72 W RGB modules in 10 parallel lines of 20 (250 maximum)
24 V DC	360 W	288 W	≈ 200 × 24V 1.44 W RGB modules in 10 parallel lines of 20 (250 maximum)

On long runs, feed the strip from both ends to avoid voltage drop and colour shift between the start and the end. With LED modules, split the load into several lines of no more than 20 modules, wired in parallel to the decoder output instead of chaining every module on a single line.

Setting the DMX address with the DIP switch

The decoder uses 3 consecutive DMX addresses (red, green and blue). The start address is set with switches 1 to 9, which work in binary: switch 1 is the lowest value and switch 9 the highest. A switch pushed down (ON, position "1") adds its value; pushed up (position "0") it counts as zero. The start address is the sum of every switch set to ON. Switch 10 (FUN) must be OFF for the unit to follow the DMX signal.

Red 10-way DIP switch on the GPT-1803_C10 DMX512 decoder, marked with the values 001, 002, 004, 008, 016, 032, 064, 128, 256 and FUN

Start address = sum of the switches set to ON. Switch 10 (FUN) OFF to receive DMX.

Value of each DIP switch on the GPT-1803_C10 decoder
Switch	1	2	3	4	5	6	7	8	9
Value when ON	1	2	4	8	16	32	64	128	256

Addressing examples

Four photos of the GPT-1803_C10 decoder DIP switch set to DMX addresses 1, 37, 328 and 510, showing the switches set to ON for each

Example DMX start addresses and the switches set to ON
Start address	Switches ON	Sum	R / G / B channels
1	1	1	1 / 2 / 3
37	1, 3 and 6	1 + 4 + 32	37 / 38 / 39
328	4, 7 and 9	8 + 64 + 256	328 / 329 / 330
510	2 to 9	2 + 4 + 8 + 16 + 32 + 64 + 128 + 256	510 / 511 / 512

The highest usable start address is 510: at 511 the blue channel would fall outside the 512-channel DMX universe.

Several decoders on one line

To control each zone separately, add 3 to the previous decoder's address. Giving several units the same address makes them all show the same colour, which is handy for grouping runs that must stay in sync.

Diagram of five GPT-1803_C10 decoders daisy-chained on a DMX line with their addresses and a 120 ohm terminator

Consecutive addresses for five independent GPT-1803_C10 decoders
Decoder	Start address	Switches ON
1	1	1
2	4	3
3	7	1, 2 and 3
4	10	2 and 4
5	13	1, 3 and 4

One DMX universe can address up to 170 independent decoders (512 ÷ 3), but each physical line carries a maximum of 32 units; beyond that you need a DMX signal amplifier.

Test mode: check the wiring without a DMX console

With switch 10 (FUN) set to ON, the decoder ignores the DMX signal and enters test mode. You can check the strip, the power supply and each channel's wiring before the lighting technician arrives.

GPT-1803_C10 decoder DIP switch with switch 10 (FUN) set to ON for test mode and switches 1 to 9 set to OFF

Switch 10 (FUN) ON = test mode. Switches 1 to 9 select the colour or effect.

GPT-1803_C10 decoder test mode functions (FUN set to ON)
Switch ON	Result
None (1 to 9 OFF)	Outputs off
1	Red
2	Green
3	Blue
4	Yellow
5	Purple
6	Cyan
7	White
8	7-colour jump (8 speeds)
9	7-colour smooth fade (8 speeds)

When several switches are ON at once, the highest-numbered one wins. With switch 8 or 9 active, switches 1 to 7 set the effect speed: all OFF is speed 0, and the highest switch set to ON gives the speed (1 to 7). For example, with FUN, 9 and 7 ON, the decoder runs a 7-colour fade at speed 7.

Step-by-step wiring

Switch off the power supply before wiring.
Connect the constant voltage supply output to the DC+ and DC− terminals. Match the strip voltage: the decoder passes its input voltage on to the LEDs.
Connect the strip's common positive to V+ and the red, green and blue wires to CH1, CH2 and CH3.
Bring the console signal into the DMX input (XLR-3 or RJ45) and continue to the next decoder from the output.
On the last unit of the line, fit a 90-120 Ω, 0.25 W terminating resistor, especially on long runs.
Set the address with switches 1 to 9, leave FUN OFF and power up.

Common mistakes to avoid

FUN left ON: the unit stays in test mode and ignores the console.
Overlapping addresses: if the second decoder starts at 2 or 3, it shares channels with the first one and the colours mix.
Common-cathode strip: the GPT-1803_C10 works with common anode (common positive); a common-cathode strip will not work.
More than 5 A per channel: split the load across several decoders or add RGB amplifiers.

Build and reliability

Metal housing measuring 125 × 52 × 40 mm with fixing tabs, for indoor installation (IP20) in cabinets, ceiling voids or sign boxes. It remembers its last state after a power cut, carries CE, FCC and RoHS certifications and comes with a 3-year GP Trader warranty, shipped from our warehouse in Spain.