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Installing the Decoder
6.9.3. Connecting the Light Outputs as well as AUX1 and AUX2
This procedure depends on the wiring of the lights and auxiliary
functions in the locomotive:
a) The lamps / function outputs are insulated from the common
pole (ground) (i.e.: the locomotive chassis); therefore they are
potential free. Fig. 11 shows the correct wiring for the outputs
AUX1 and AUX2. The functions of the locomotive must be
potential-free, in other words there may not be any other con-
nection to the function besides the wires from the decoder.
The voltage at these outputs is about 1.5V lower than the track
voltage. The blue wire is the „plus-pole"; the function output
the „minus-pole".
If LEDs are installed (also refer to Fig. 11), then a resistor must be
wired in series with the LEDs. It should have a rating of between
470 Ohms and 2.2 kOhms. Running the LEDs without this resistor
will lead to their destruction!
b) The lamps / function outputs are wired (together) against the
chassis of the locomotive (as in most locomotives by Märklin®
as well as in most older locomotives by Fleischmann® and
ROCO®).
The wiring is simpler but the available voltage is about half.
This type of connection is not suitable for multi-protocol opera-
tion.
Both M4 and Motorola® packets are asymmetrical. Therefore, the
function outputs do not have continuous power. This leads to a
rhythmic flicker of the headlights (pulsing) that becomes particu-
larly obvious with LEDs.
Furthermore, the headlights will only work in one direction in
analogue DC mode. Whether it will be the forward lights or the
backup lights depends on which way you have placed your loco-
motive on the track.
• Solder the backup lights to the yellow wire, the headlights to the
white one.
• The green wire connects to the function output AUX1.
• The voilet wire goes to the function output AUX2.
If your locomotive is wired according to option b), then it is ready
for use. Otherwise, you must connect the remaining wires of all
bulbs and functions together to the blue wire. This pole may not
have any connection to the chassis!
As shown in Fig. 4 it is possible to use both options in the same
locomotive.
6.9.4. Purpose of AUX3 and AUX4
6.9.4.1. LokSound with 21MTC Interface
LokSound decoders with 21MTC interface have two additional
outputs besides the 4 standard outputs, namely AUX3 and AUX4.
Since they are pure „logic-outputs," it is not possible to connect
any external loads directly. External power transistors are required.
Connect AUX3 and AUX4 via the interface; there are no wire
leads. In terms of their functionality, AUX3 and AUX4 are equal to
the other outputs. ESU offers an appropriate adapater board (art.
no. 51968) with transistors.
6.9.5. Suitable Smoke Generators
Unfortunately, it is not an easy task to find the right smoke gen-
erator for each locomotive. The amount of smoke generated de-
pends on the following factors:
a) Track voltage
The track voltage varies depending on the command station.
Therefore, it is possible that a locomotive generates smoke
when driven by one digital system but does not generate any
smoke with another system. Even 1V variation makes a big
difference.
b) Type and tolerance of the Seuthe smoke generator and the
smoke distillate
Seuthe smoke generators have considerable production toler-
ances. Therefore, it is possible that one unit works perfectly well
while another does not. Type of distillate and filling level have
an influence as well.
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