Railway switches and signals – Block-signal systems – Automatic
Patent
1981-07-17
1986-10-28
Groody, James J.
Railway switches and signals
Block-signal systems
Automatic
246 34B, 246167R, 371 25, B61L 2100
Patent
active
046194258
ABSTRACT:
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 representing binary digits 1 and 0, respectively. The code pattern, polarity and pulse length, is balanced to eliminate code distortion by track energy storage. The code pattern transmitted is determined, and received pulses are decoded, by a microprocessor 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 generation 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.
REFERENCES:
patent: 3543236 (1970-11-01), Sibley
patent: 4161718 (1979-07-01), Cohen et al.
patent: 4320881 (1982-03-01), Campbell
American Standard Inc.
Groody James J.
Williamson, Jr. A. G.
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