A system for controlling a Venetian blind comprising: - a blind assembly comprising a Venetian blind, an electric motor for actuating the movement of said Venetian blind and first electronic means configured to generate a drive signal for driving said electric motor; - a control unit having drive means for driving the movement of said Venetian blind, a power source for generating a current signal to power said electric motor and second electronic means that are in signal communication with said drive means and with said power source for controlling said electric motor; - a two-wire power line disposed between said control unit and said blind assembly to power said electric motor with said current signal; - said first electronic means are in signal communication with said second electronic means via said two-wire power line; characterized in that: - said first electronic means are configured to generate a first data signal identifying the state of said electric motor and to detect said current signal in said two-wire power line identifying the current value absorbed by said electric motor; - said second electronic means are configured to receive said first data signal and to filter it against said current signal, said second electronic means are configured to process said first data signal and said current signal to thereby generate a second data signal, wherein said first data signal and said second data signal (S2, S3) have their own frequency value, differing from a frequency value of said current signal; - said first electronic means are configured to receive said second data signal, to filter it against said current signal and to process it to thereby generate said drive signal. - a blind assembly comprising a Venetian blind, an electric motor for actuating the movement of said Venetian blind and first electronic means configured to generate a drive signal for driving said electric motor; - a control unit having drive means for driving the movement of said Venetian blind, a power source for generating a current signal to power said electric motor and second electronic means that are in signal communication with said drive means and with said power source for controlling said electric motor; - a two-wire power line disposed between said control unit and said blind assembly to power said electric motor with said current signal; - said first electronic means are in signal communication with said second electronic means via said two-wire power line; - said first electronic means are configured to generate a first data signal identifying the state of said electric motor and to detect said current signal in said two-wire power line identifying the current value absorbed by said electric motor; - said second electronic means are configured to receive said first data signal and to filter it against said current signal, said second electronic means are configured to process said first data signal and said current signal to thereby generate a second data signal, wherein said first data signal and said second data signal (S2, S3) have their own frequency value, differing from a frequency value of said current signal; - said first electronic means are configured to receive said second data signal, to filter it against said current signal and to process it to thereby generate said drive signal.