Facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving therealong
First Claim
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1. A facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving along said guideway comprising:
- data transmitting equipment in said trackside equipment to transmit data to said vehicle in the form of serial bit data messages protected against errors by means of a cyclic code using a redundancy technique, said transmitting equipment includingtwo independent storage arrangements each having identical data stored therein;
a message transmitter to transmit data to said vehicle;
a first parallel-serial converter coupling one of said two storage arrangements to said message transmitter;
a second parallel-serial converter coupled to the other of said two storage arrangements;
a feedback shift register coupled between said second parallel-serial converter and said message transmitter; and
means coupled to said first converter and said shift register to time the delivery of data to said message transmitter from said first converter and said shift register to provide a data message for transmission to said vehicle having an information portion provided by said first converter and a redundant portion provided by said shift register.
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Abstract
A facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving therealong is disclosed which transmits two identical data records held in two independent storage arrangements in the trackside equipment to a data receiver in the vehicle according to fail-safe principles. Error protection of the data is provided by means of a cyclic code. To enable monitoring the transmitting equipment for component failures from the receiving equipment, a special bit group is transmitted whose bits are checked for equivalence in the receiving equipment.
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Citations
5 Claims
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1. A facility for fail-safe data transmission between trackside equipment of a guideway and vehicles moving along said guideway comprising:
data transmitting equipment in said trackside equipment to transmit data to said vehicle in the form of serial bit data messages protected against errors by means of a cyclic code using a redundancy technique, said transmitting equipment including two independent storage arrangements each having identical data stored therein; a message transmitter to transmit data to said vehicle; a first parallel-serial converter coupling one of said two storage arrangements to said message transmitter; a second parallel-serial converter coupled to the other of said two storage arrangements; a feedback shift register coupled between said second parallel-serial converter and said message transmitter; and means coupled to said first converter and said shift register to time the delivery of data to said message transmitter from said first converter and said shift register to provide a data message for transmission to said vehicle having an information portion provided by said first converter and a redundant portion provided by said shift register. - View Dependent Claims (2, 3, 4, 5)
Specification