Patent ID: 7864675

Claim:
An automation device, with which a multiplicity of physically distributed functional units communicate with each other by means of a common transmission protocol, having a microcontroller, which is assigned at least one clock generator and one memory unit, and which is connected at least to one data sink, which is designed to accept a received data bit-stream, and to which is input an FSK-modulated line signal having a higher signal frequency and a lower signal frequency, wherein said automation device comprises: a zero-crossover detector ( 182 ), a plurality of monoflops connected in a parallel manner to the zero-crossover detector ( 182 ), the plurality of monoflops comprising: a. a first retriggerable monoflop ( 183 ) having a hold time that is shorter than half a period duration of the higher signal frequency, b. a second retriggerable monoflop ( 184 ) having a hold time that is shorter than half a period duration of the lower signal frequency and longer than half the period duration of the higher signal frequency, and c. a third retriggerable monoflop ( 185 ) having a hold time that is longer than half the period duration of the lower signal frequency, and an evaluation stage ( 186 ) connected to the outputs of the first, second and third monoflops ( 183 , 184 , 185 ), wherein in the evaluation stage ( 186 ) a data bit is determined and output on the basis of the output states of the first, second and third monoflops ( 183 , 184 , 185 ).