We have created an adapter with a PluX22 interface for installation in locomotives that do not already have a suitable connector or socket.

We supply the adapter in three variants:

Only with PluX22 socket	With PluX22 socket and SUSI3-Classic	With PluX22 socket, SUSI3-Classic and screw terminals
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The circuit board also provides space for:

• 2 diodes for connecting motors with field coils (e.g. old Märklin locomotives).
• a diode each for front and rear light for connecting lighting with only one wire (second pole on the housing).

Notes:

• For IR receivers and NFC readers there are no suitable connections in the standard PluX22. Therefore these are connected to the CTC locomotive module via the separate 10-pin socket.
• For the locomotive module PluX22, the drive light is configured as a switch against minus (LowSide). If it is to switch against the positive terminal (HighSide), the light must be removed in the config dialog and replaced with one with HighSide. See for this the conversion of the Märklin BR53 (Borsig I).

Wiring

The example shows the wiring of an old analog locomotive with a field coil and an electric decoupler at the front and rear:

Here is the view from the back, as it results for example with the variant with screw terminals:

The diodes must be ordered separately and soldered in yourself. The PluX22 socket is always soldered on.

The hole in the circuit board is electrically connected to Track-1, so this connection can alternatively be made by screwing it to the housing. With old Märklin locomotives, the circuit board can be screwed on where the switch was previously fixed. A cable to the wheels/housing is then not necessary.

If the locomotive has a permanent magnet, the two right diodes are omitted and the top one is replaced by a piece of wire. The motor is then connected to Motor+ and Motor-A. Motor-B remains unused.

If the front and rear lights have two wires (i.e., no connection to the locomotive housing), the two left diodes can be replaced by pieces of wire.