B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/32
B61L 3/20 (2006.01) B61L 1/18 (2006.01) B61L 21/06 (2006.01) B61L 23/22 (2006.01)
Patent
CA 1189178
ABSTRACT OF THE DISCLOSURE An alternating current code, alternately transmitted in each direction through the rails of a railroad track section, includes a selected number of pulses of alternately positive and negative polarity similar to a bi-polar DC code. Data is transmitted by pulse length, with long and short pulses repre- senting binary digits 1 and 0, respectively. The code pattern, polarity and pulse length, is balanced to eliminate code dis- tortion by track energy storage. The code pattern transmitted is determined, and received pulses are decoded, by a micro- processor with associated memory (PROM) which processes local input and output data. The processor also checks the operation of the associated apparatus, including input and output circuit and hardware integrity through monitor devices and feedback signals. A unique check signal output is produced only when the various monitor networks determine all operation is proper and that the various elements are free of faults. The genera- tion of operating energy for the associated apparatus by a power supply unit is dependent upon its continued reception of this check signal from the processor. Absence of the check signal indicating apparatus fault or operational failure shuts down the system operation at that location.
403815
American Standard Inc.
Fetherstonhaugh & Co.
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