Circuit arrangement for the busy indication of track sections of

Details Circuit arrangement for the busy indication of track sections of Circuit arrangement for the busy indication of track sections of

1994-10-11

1995-11-21

Le, Mark T.

Railway switches and signals

Train-position indication

Miniature model

246 34B, 246 28D, 246 86, 246 90, 246 92, A63H 1900

Patent

active

054679460

ABSTRACT:
The invention refers to a circuit for the busy indication of track sections (1, 2, 3, 4) electrically isolated from each other of a model railway system digitally controlled by a control center (Z). After a controlled digital receiver (E) of an engine determines its own address code with the help of a decoding device, it provides a busy signal via a signal generator (8) to the assigned busy indicator (BM3). To simplify the circuit considerably and to be able to do without the the RF-signal generators so far used in the engine and corresponding RF-receivers of the busy indicator, the signal generator of each engine (A, B) comprises a d.c. source providing a busy signal of a given polarity corresponding to the engine direction on the track as the busy signal to the busy indicator (BM3). Each busy indicator (BM3) comprises a direct voltage comparator (20) which can measure the busy signal received in zero-volt measurement gaps of the control signal and thus makes it possible to assign the engine designation to a given track section as well as the position of the engine on the track.

REFERENCES:
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patent: 5263669 (1993-11-01), Ehrlich
patent: 5330135 (1994-07-01), Roberts

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