The merchandise under consideration is identified as the Analog Input Module (Input Module), PN 4019453, which is described as an input interface module principally used with the Jupiter II Control System. The Input Module consists of a metal enclosure with a network port, a DC power input port, a DC power output port, eight sensor input ports, and three LED status indicators. You state that the Input Module is used with analog devices that have a varying feedback voltage, such as engine sensors, fuel gauges, position/proximity sensors, push buttons, etc. The status of each connected device is monitored and fed to the Jupiter II Control System controller, which then makes control decisions in accordance with its programmed logic. Based on the information provided, the DC output port on the Input Module is used merely to connect power to additional Input Modules in a networked configuration.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N320132