Patent ID: 7913026

Claim:
A data transfer apparatus comprising: a first port connected to a first controller; a second port connected to a second controller; a data selection controller that selects part of transmission/reception data transferred between the first controller and second controller; a history storage section that is connected to the data selection controller and retains the part of transmission/reception data selected by the data selection controller; a third port that outputs the part of transmission/reception data retained by the history storage section to an analysis apparatus; a setting information storage section that is connected to a system controller for controlling the data transfer apparatus and stores setting information concerning which part of the transmission/reception data is to be selected by the data selection controller and thereby retained in the history storage section; and a fourth port that connects the data selection controller and the system controller, wherein the setting information is set by the system controller through the fourth port, and the history storage section functions as a buffer storing data output to the analysis apparatus via the third port.