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The turntable motor is controlled by a loc decoder designed for DC motor types. The function outputs, front and back light, are used to activate the turntable. (yellow wires)

The center contacts of all turntable rail-clips should be electricaly isolated, or as I did removed, and connected to s88 compatible feedback module. (Those modules accepting also the "red-wire" as input signal.) They should be declared in the plan.xml as the posfb's int the turntable tracks.

  <tt id="TT01" addr="80" x="18" y="11" z="1" type="locdec" desc="Bahnbetriebswerk Neustadt">
    <track posfb="FB300" nr="12" locfb="FB49" blockid="BL18" desc="Main entrance"/>
    <track posfb="FB305" nr="42" locfb="FB310" desc="Abstellspur"/>
    <track posfb="FB304" nr="41" locfb="FB309" desc="Schuppentor 1"/>
    <track posfb="FB303" nr="40" locfb="FB308" desc="Schuppentor 2"/>
    <track posfb="FB302" nr="39" locfb="FB307" desc="Schuppentor 3"/>
    <track posfb="FB301" nr="36" locfb="FB306" desc="Sand Wasser Kohlen"/>
  </tt>

Those feedbacks are activated by the lips of the turntable bridge center contact rail.

The turntable has 48 steps of 7.5°. The connected tracks are numbered counter-clockwise and track 0 is the 0° of the first quadrant. This is the way the RocGui renders the turntable, and this item can not be rotated.

Decoder wiring (click to get the big picture of 300Kb)

Position-feedback getter contact.

Position-feedback getter contact wiring.

Position-feedback activator: remove this from one side of the bridge.

For DC turntables the position sensors can be made with Reed relay and at one side of the bridge a magnet.