MICROPROCESSOR BASED TRACK CIRCUIT FOR OCCUPANCY DETECTION AND BIDIRECTIONAL CODE COMMUNICATION

摘要

MICROPROCESSOR BASED TRACK CIRCUIT FOR OCCUPANCY DETECTION AND BIDIRECTIONAL CODE COMMUNICATION A bidirectional coded track circuit with a microprocessor implemented transmittor/receiver pair provided at insulated joint locations of the track. One-half of the transmittor/receiver pair manages the communication flow for each direction of information flow at the insulated joint. Associated with each transmittor/receiver is auxiliary apparatus which couples the microprocessor input/output port to the track rails. The receiver distinguishes the two polarities of track current flow and the track current generator produces both positive and negative pulses of current for transmission in the track rails.