Patent ID: 8307227
Filing Date: 2012-11-06
Classification: H04L

Abstract:
1. A data communication system, including: a data processing unit; a central control unit; a data connection connecting said data processing unit to said central control unit; a power source at said central control unit to provide power to said data processing unit over said data connection; wherein said central control unit includes a synchronisation unit for outputting via said data connection a synchronisation signal to said data processing unit by changing the voltage of said data connection from a steady state voltage level to a second non-zero voltage level, the absolute value of the second voltage level being smaller than the absolute value of said steady state voltage level, said synchronisation signal not associated with a corresponding discharging of said data connection subsequent to outputting said synchronisation signal; and wherein said data processing unit includes a data generator for generating data and transmitting said generated data to said central control unit as a pulsed current in response to determining said voltage of the data connection has returned to the steady state voltage level following said synchronisation signal.