Vinod Georg George, 638078 Slater Dr, Rockford, IL 61108

6151567, Nov 21, 2000

May 27, 1994

8/250139

Arnold A. Ames - Pecatonica IL
Charles H. Gooden - Rockford IL
Donald P. Krakauskas - Winnebago IL
Vinod George - Rockford IL

Hamilton Sundstrand Corporation - Rockford IL

G06F 300

703 13

A data communication analysis and simulation tool capable of simulating in real time the transmissions and data responses of at least one line replaceable unit communicating on at least one communication bus with at least one line replaceable unit under test, comprising a computer operating under a real time operating system and having available memory and means for accepting user input, and a programmed simulator resident in said computer comprising a plurality of processes to effectuate the simulation of the transmissions and data responses of at least one line replaceable unit. The programmed simulator allocates a portion of the available memory as a shared memory segment serving as a central database and supporting inter-process communication. The programmed simulator further generates graphical and textural images in response to communicated data from the line replaceable unit under test and user input to a monitor coupled to the computer. The programmed simulator inputs digital and analog inputs and updates the data transmissions in real time, inputs communication data and outputs digital outputs in real time, and maintains data validity and freshness in real time.