A system is provided for monitoring at least one data bus of an aircraft. The system includes an aircraft adapted to control the operation of stores of a second predetermined type (e.g., Harpoon Block I missiles). However, the aircraft is also capable of carrying a store of a first predetermined type (e.g., Harpoon Block II missiles), and capable of communicating with the store across a communication bus (e.g., MK-82 Digital Data Bus). The system also includes a bus monitor assembly capable of capturing data communications transferred across the communication bus between the aircraft and the store, the data communications being captured from the communication bus. The bus monitor assembly is also capable of preparing the data communications, and monitoring the communication bus across which the data communications are transferred, the communication bus being monitored based upon the prepared data communications.