The Monitor mode allows the FIT to see devices that are connected to and communicating on the bus. If the health bars appear on the display when the FIT is connected to the bus, then communications are occurring. Enter the Monitor mode by pressing the Enter Key or by scrolling to the Monitor menu. The Monitor mode only listens to the communications occurring on the bus, does not interact with the communications, and therefore does not affect the operation of the bus. The Monitor mode is recommended to use first if communications are already occurring on the bus. For more information, see the FIT Menu and Monitor Menu .