Patent ID: 8664806

Claim:
A communication bus having at least one pair of communication lines for connecting in series, respectively, to conductors of a main communication bus for connecting to communicating devices of at least one electric panel, said communication bus comprising at least two branched outputs each having at least two branch lines, said branch lines, respectively, having a first end connected to a communication line, and having a second end designed for connection to a communicating device, wherein: the communication lines are etched in a first conducting layer of a printed circuit, and the branch lines are etched in a second conducting layer of said printed circuit, wherein a first end of each of the branch lines is connected to a single one of the communication lines, respectively, the communication lines are separated from one another by a distance between 1 mm and 15 mm, the cross-section of each communication line being greater than 0.1 mm 2 , the cross-section of each branch line is greater than 0.01 mm 2 , and the first and second conducting layers are separated by a distance greater than 1.4 mm.