Patent ID: 7760106

Claim:
A signaling system for use with a plurality of power cells each cell having a different supply voltage interval ((V(Ci−), V(Ci+)) and each cell having its respective signaling device, and whereby each signaling device is powered by the correspondent power cell, the signaling system comprising: at least, an (i−1)th and an ith signaling device; a communication link for transmitting signals from an output terminal of said (i−1)th signaling device to an input terminal of said ith signaling device; said communication link consisting of an electrical conducting connection; wherein said (i−1)th signaling device comprises means for varying the electrical potential at said output terminal in dependence upon the signal to be transmitted; and said ith signaling device comprises means for sensing, via said communication link and said input terminal, the variation of potential of said output terminal and for outputting a signal which varies in dependence upon the sensed variation of potential and said ith signaling device further comprises means for limiting the variation of electrical potential at the output terminal of the (i−1)th signaling device to the supply voltage interval [V(Ci−1 − ), V(Ci−1 + )] of said (i−1)th signaling device.