Patent ID: 8026790

Claim:
A device ( 1 ) for safe data transmission to railway beacons, characterized by comprising a first and a second circuit section ( 1 a , 1 b ) independent of and galvanically separate from each other, and each comprising: a microprocessor ( 6 a , 6 b ) selection stage ( 2 a , 2 b ) configured to receive information signals relative to the status of a portion of a railway line, and to generate at least one telegram for transmission to a beacon; and a control stage ( 3 a , 3 b ) configured to compare the telegrams generated by the first and second circuit section ( 1 a , 1 b ) for enabling/disabling data transmission to said beacon; said first circuit section ( 1 a ) also comprising a transmission enabling stage ( 4 , 5 , 17 ), configured to allow transmission to said beacon of the telegram generated by said first circuit section ( 1 a ), in the event the comparison performed by said control stage ( 3 a , 3 b ) is successful; wherein said transmission enabling stage ( 4 , 5 , 17 ) comprises a fast cut-off circuit ( 4 ) interposed between an output of said microprocessor ( 6 a ) and said control stage ( 3 a ) of said first circuit section ( 1 a ); said fast cut-off circuit ( 4 ) preventing passage of said telegram in the event said comparison by said control stage ( 3 a , 3 b ) is unsuccessful; wherein said fast cut-off circuit ( 4 ) comprises a first and a second AND logic gate ( 30 , 31 ), each having a first input ( 10 a ) to which said telegram is sent; each AND logic gate having a second input, to which an enabling signal (EN 1 , EN 2 ) from said microprocessor ( 6 b ) of said second circuit section ( 3 b ) is sent; said fast cut-off circuit ( 4 ) also comprising an OR logic gate ( 32 ) receiving the outputs of said AND logic gates ( 30 , 31 ); and both said enabling signals (EN 1 , EN 2 ) having a low value in the event said comparison by said control stage ( 3 a , 3 b ) is unsuccessful.