Patent ID: 8744667

Claim:
A diagnostic device for operating situations in at least one communication network having of a bus with N wires, wherein N≧1, characterized in that the diagnostic device comprises: i) P connection means, wherein P≧N, suitable to be connected in parallel respectively at least to said N wires of the bus to access P available voltages, ii) conversion means arranged for converting said P voltages in P first digital signals (S 1 ( p,t )), iii) processing means arranged for forming a measurement vector (V(t)) associated with a measurement time (t) of the voltages and comprising K elements selected among at least said P first digital signals (S 1 ( p,t )), then for comparing at least said measurement vector (V(t)) with at least I pairs, wherein I≧1, of the first (V r1 (i,t)) and second (V r2 (i,t)) reference vectors comprising K elements and representative of K minimum and maximum values that can be assumed by the K elements of said measurement vector (V(t)), in order to deliver I second signals (S 2 ( i )) each representative of the result of the comparison, whereby each result is representative of an operating situation on said bus, and iv) I display means each arranged for signaling an operating situation represented by a second delivered signal (S 2 ( i )).