Servo controlled with DC-Car Decoder

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With introduction of the new decoder DC07 and DC08 Generaton an improved and more comprehensive control of servos in micro models is possible. The decoder DC04, DC05 and DC06 also boast a servo control possibility which is however very limited. There is thus the possibility to use the two multi-function terminals (MF1 and MF2) as a servo outputs. In this mode, the decoder at these outputs a servo signal, whereby the control of small servomotor or throttles can be realized with CV20 can define which MF output the servo signal to output:


CV20 = 0 MF1 = Licht 4-----MF2 = Light 3
CV20 = 1 MF1 = Servo 1----MF2 = Light 3
CV20 = 2 MF1 = Licht 4-----MF2 = Servo 2
CV20 = 3 MF1 = Servo 1----MF2 = Servo 2

Connecting Servo's to the servo decoder is quite simple. The control line of servo (usually brown or orange) is compared with the respective multifunction terminal (MF) MF1 and / or MF2 connected.

Conneting Servo to DC04-DC07
Conneting Servo to DC08-I

It is also to note that the voltage converter of the decoder can not be used for the voltage supply of the servo. For this reason, the connection of power to the servo is made directly to the battery, ie parallel to the decoder. Ideally, a LiPo battery are used because this provides the optimum voltage and current for the safe operation of the servo. The voltage converter of DC07-SI must be connected in this case a diode. This happens in the in the voltage supply line just a diode is installed. Now only the corresponding transmitted along the rails for the servo mode must be changed, and then you can start already.

With CV 21 is defined whether the MP outputs to the switch addresses from CV 11 - wants to control 18 - CV 14 (red / green buttons) or the digital addresses of CV 1 and 3, 15. It should be noted that no mixed operation long / short digital addresses is possible. Either you nutz short or long digital addresses (CV29).

If this definition is carried out is now the setting routine for each servo. For this to be, depending on the desired function of the servo, the transmitted along the rails in the attached CV list requires.
The easiest and most convenient way to set the end position of a Servo's in which it moved into the respective end position and this is simply stored. For this purpose we write the value "1" in the respective CV 144 - 147. In the decoder the position of Servo's in the transmitted along the rails is then written 140 to 143, which is then subsequently have to adapt. For this purpose we write the value of the respective end position in milliseconds directly into the transmitted along the rails. Here applies: the value 44 = 0.5 ms and 2.5 ms = 200. The CV-Programmer these 4 transmitted along the rails are then read out and changed.

In CV 138 and 139, the speed can be changed. Here corresponds to the value "1" of the slowest and "255" the fastest speed. The stride length (continuously or with gradation) is adjusted by the transmitted along the rails 152 and 153. Corresponds to the value "1" stepless rotation and "255" maximum gradation (gradually).

The definition of the servo function is performed in CV 148. Here the following operating modes for both Servo's separated possible:

Servo drives in max. End position
Servo drives in the CV 140 -
end positions stored 143 Servo drives in the CV in 140-143 stored end positions back and forth with the number defined in CV 150 and CV 151 repetitions

If you want to place the Servo's operate with the switch buttons using the control dial the command station, then you can 1 and 2 set the digital address to the servo outputs.
This is done with the CV 21:
32 = speed level of 1 digital address is set to servo 1 | 64 = gear from 2nd digital address is set to servo 2 |
The transmitted along the rails 138-153 have no effect on the control of Servo's.

Instead of a servo drive controller can be connected and thus additional motors are operated. Again you can choose between the operation means turnout address (red / green buttons) or the digital addresses (driving control knob).

Application examples for servo operation in vehicles:

MAN TLF 24/50 Tanklöschfahrzeug mit drehbarem Dachmonitor

Tatra 815 TLF 32 Tanklöschfahrzeug mit drehbarem Dachmonitor

MB SK WaWe 9000 Wasserwerfer mit drehbaren Werfern