Patent ID: 7860173
Filing Date: 2010-12-28
Classification: H04B

Abstract:
1. Electrical system comprising: a central unit; more than one node; and bus arrangement connecting the more than one node and the central unit for transfer of data there between; the bus arrangement having a single conductor pair; the central unit comprising a voltage supply arranged to provide a voltage between the conductors in the conductor pair; the central unit further comprising a voltage modulator, arranged to modulate at least two successive voltage pulses onto the conductor pair representing data to be transferred from the central unit to the more than one node; whereby a time separation between the successive voltage pulses takes one of n distinct predetermined first values, where n>2, each of the n distinct predetermined values corresponding to a predetermined data quantity; the more than one node comprising a detector of the modulated voltage pulses or quantities directly related thereto; and the more than one node further comprising an interpreter, interpreting the detected modulated voltage pulses as transferred data; the interpreter in turn comprises means for determining the time separation between the successive voltage pulses and means for associating the determined time separation with a corresponding data quantity, the more than one node further comprising means for creating a current pulse on the conductor pair representing data to be transferred from a respective node to the central unit; whereby a time separation between the current pulse and the closest preceding voltage pulse takes one of k distinct predetermined values, where k>2, each of the k distinct predetermined values corresponding to a predetermined data quantity; and the central unit further comprising: