Trailer decoder

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[File:g-anh.jpg|500px|thumb|right|Picture: Torsten Sauer]] Der Anhänger-Decoder


Why was a special trailer decoder developed?
So far, a lot of wires were needed to power the lights on a trailer.

  • For light vehicles, the trailer hangs rigidly on the cables and does not deflect.
  • Trailers with many cables are difficult to hang off and on again.
  • For semi-trailers it is not easy to lay the many wires through the kingpin.

Not only for vehicles with trailer this decoder is suitable. This can also increase the number of outputs to connect more lights.

The trailer decoder consists essentially of the well-known decoder hardware and special software.
The turn signals etc. in the trailer are switched on or off synchronously with the towing vehicle.

Only when the towing vehicle sends a signal will the lights shine.
The trailer decoder does not show the turn signals or brake light like a towing vehicle when switched on.

What will transfer

Which functions are transferred to the trailer:

* Rear light * Brake light * Left turn signal * Right turn signal * Rear infrared
* Blue light * Front flasher * Light 1 * Light 2 * Light 3

It is transmitted no feedback signal! Thus, the XT module can not evaluate.
The distance signal is sufficient as feedback for the S88-IR.
The distance signal can not be switched off on the DC05-A or DC05-SA.

Cable connection

1.Cable connection
Only 2 cables are needed if the trailer has its own battery.
3 cables are needed if the trailer does not have its own battery and is powered by the motor car

Possible decoders

2. Possible battery and decoder combinations:

CompilationTruck or tractorKabelWhich voltage
is transmitted
1 DC07-SI (DC05-SI,DC04-SI) with battery 1-3 Volt
DC07-I (DC05-I,DC04-I, DC08-I)
with battery 3-5 Volt
2 noDC05-SI-A (DC04-SI-A) with battery 1-3 Volt
DC05-S-A (DC04-S-A) with battery 1-3 Volt
DC05-A (DC04-A) with battery 3-5 Volt
2DC07-SI (DC05-SI) with battery 1-3 Volt
DC07-I (DC05-I,DC08-I) with battery 3-5 Volt
3 Voltage 1-3 Volt
Voltage 3-5 Volt
DC05-SI(DC04-SI) 1-3 Volt
DC06-I-A 3-5 Volt
3 DC07-SI (DC05-SI, DC04-SI) with battery 3 + 4 - 5 Volt DC05-A, DC06-I-A (DC04-A)
4 DC07-I (DC05-I) without battery
DC07-I(DC05-I, DC08-I) without battery
4 + 1 - 3 Volt and
+ 4 - 5 Volt
DC05-S-A with battery 1-3 Volt
DC05-A with battery 3-5 Volt

Connection diagramms

Combination 1 Towing vehicle - trailer
Motor car 1-3 V and trailer 1-3 V each have their own battery.

Combination 2 Towing vehicle - trailer
Motor vehicle 1-3 V and the trailer are powered by the same battery.

Combination 3 Towing vehicle - trailer
Motor vehicle 1-3 V and the trailer is supplied with 4 V from the motor car.

Combination 4 Towing vehicle - trailerr
Motor car 4 V from the trailer is supplied with 1-3 V battery.

Combination 5 Towing vehicle - trailer

Combination 6 Towing vehicle - trailer
Motorcar 3-5 V from the trailer is also supplied with 3-5 V battery itself.

Combination 7 Towing vehicle - trailer
Motor car 1-3 V battery trailer 3-5 V battery self-powered.

The normally used and least expensive application is number 3. However, the voltage transformer in the towing vehicle is more heavily loaded.
If a separate battery is used in the trailer, it can be made smaller, because the decoder in the trailer has much less power consumption
Advantages of the trailer decoder:
Only a few cables needed from the truck to the trailer.
This makes it possible to make the connection pluggable.
Skilled hobbyists will definitely be ready to install an automatic clutch.
All the lights on the trailer are synchronized with the towing vehicle.
By further grinding the connection several trailers can be attached to a truck.
For semitrailer tractors, fewer cables are needed if a trailer decoder is used in the trailer.

Special Cases

Other functions:
If a phototransistor is connected to the trailer decoder (DC04-SI), even the CVs can be programmed.
Note: No motor can be operated on the trailer decoder, even if the transistor is available for production reasons!


Setting the CV20 in the towing vehicle:
In order to activate communication to the trailer, the CV20 train train decoder must be set to value 4 or 12 Setting the CV21 in both decoders:
The values ​​4 or 24 in the CV21 in the trailer decoder must be set exactly the same as in the decoder in the towing vehicle. Otherwise the communication between the two decoders will not work properly.
In this case, the lights on the trailer can flash wildly or nothing happens.

Trailer decoder setting:

  • Use the CV-Programmer on the update socket.
  • Connect the trailer's IR receiver port to the tractor's IR receiver port. Then the trailer responds to the IR signals as the motor car.

If one first changes the address of the train decoder, e.g. CV1 = 5, then you can continue to change the trailer via address 1 without changing the train decoder.

  • Connect a 470 KOhm resistor and minus to the digital connection of a DCC system.

The trailer decoder DC05-SI-A, DC05-I-A can be adjusted:

  • Phototransistors are connected at the input.

With a Digitalzenrtale the trailer decoder can be adjusted
Distance control with a trailer:
The rear infrared LEDs connected to the trailer decoder keep the tracker at bay.
No XT signals are transmitted

Battery Status in If the trailer has its own battery, it can also be monitored with the decoder.
Flashing function of the brake lights!
No transmission to the XT module!

Light sensor in If the towing vehicle has a light sensor, the trailer will not need another light sensor.
The lighting in the trailer is switched on or off syncron in this case as well.

Wireless Trailer

Extension to the wireless trailer see Wireless trailer

Further applications

To get even more light outputs, the trailer decoder can also be installed. There are 4 more blue lights and a front flashlight available.
If the timings are changed via the CV setting, these insert lights will run asynchronously to the already existing lights or can be used as permanent lights.