An on/off occupancy sensor when connected to a control system, would generally be connected to:

An on/off occupancy sensor typically outputs a binary signal indicating whether there is occupancy detected or not. This type of signal is best suited for a digital output connection within a control system. Digital outputs can read the two-state nature (on/off) of the sensor, allowing the control system to respond appropriately—either activating or deactivating lighting or HVAC systems based on the presence of occupants in a space.

In contrast, analog inputs are designed to receive varying levels of signals rather than a simple on/off status, which does not align with the operational characteristics of an occupancy sensor. Mechanical relays serve as switches that physically open or close circuits, which is not necessary for direct sensor integration into modern control systems; they add physical components that can complicate the system. Manual switches require human intervention to operate and do not automatically adjust based on occupancy, which goes against the purpose of an occupancy sensor. Therefore, a digital output is the most logically consistent choice for integrating this type of sensor into a control system.