Patent ID: 6744735
Filing Date: 2004-06-01
Classification: G01R,G05B,G06F

Abstract:
A network diagnostic device, comprising:a diagnostic communication line connected to all of a plurality of control units, each of the control units being connected to a common communication line via its corresponding branch line to enable a mutual communication with the other control unit; a normal state determining section that operatively performs such a network diagnostic processing as to cause each one of the control units to transmit an interrogation signal to all of the other control units and as to determine whether an acknowledgement signal is transmitted from each of the all of the other control units to the each one of the control units in response to the interrogation signal within a predetermined period of time to determine a normal state of a communication between each one of the control units and the other thereof; and a map display section that displays a correlation map in a matrix form having a plurality of matrix intersections, each matrix intersection being a one-to-one combination of any one of the control units and the other of the control units and being displayed in a pattern to discriminate between the normal state of the communication and an abnormal state thereof.