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Patent

Digital multi-train control with bi-directional data transmission in model railways

Bernd Lenz
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TLDR
In this paper, a method and device which digitally controls moveable and/or stationary electrical consumers in a model railway is presented, where the power for the consumers is supplied over the track in the form of a square wave voltage signal which is frequency and pulse width modulated according to digital control information generated by a central control unit of the model railway.
Abstract
A method and device which digitally controls moveable and/or stationary electrical consumers in a model railway. The power for the consumers is supplied over the track in the form of a square wave voltage signal which is frequency and/or pulse width modulated according to digital control information for the consumers generated by a central control unit of the model railway. A consumer, after having received a control information addressed to said consumer, applies a return signal to the track, which return signal has a higher frequency than the frequency of the modulated square wave voltage. This return signal is detected by synchronising the detection to the square wave voltage such that the return signal is detected in periods of the square wave voltage signal which are free of signal edges.

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Citations
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References
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TL;DR: In this paper, a transponder detection system for detecting and identifying transponders on a model railroad layout is presented. But it is not suitable for the use with multiple information cources, and the system can also be configured to decode an output of a trans-ponder acknowledgement detector (13, 17) at predefined periods that are not related to an interrogation of trans-device address.
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