The **FSP-211-R** (commonly associated with the Wattstopper series) is a motion sensor designed for high/low/off control of LED drivers or electronic ballasts. It is an integrated electronic component used primarily in outdoor and industrial lighting fixtures. --- ### 1. Key Electronic Specifications The FSP-211-R operates as a multi-level control sensor using passive infrared (PIR) technology. | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 120–277 VAC, 50/60Hz | | **Load Rating** | 0-800W (LED/Ballast), 1/6 HP Motor | | **Control Signal** | 0-10VDC (Dimming) | | **Detection Technology** | Passive Infrared (PIR) | | **Output Type** | Sinking Current (up to 50mA) | | **Environment** | IP66 Rated (Weatherproof) | --- ### 2. Core Electronic Components The device consists of several critical subsystems: * **PIR Pyroelectric Sensor:** The "eye" of the device. It detects changes in thermal energy (infrared) within its field of view. * **Fresnel Lens:** A multi-segmented plastic cover that focuses infrared energy onto the PIR sensor, defining the detection pattern. * **Switching Relay:** An internal mechanical or solid-state relay that handles the primary power switching (On/Off). * **0-10V Dimming Circuit:** An analog control interface that communicates with the LED driver to adjust brightness levels based on occupancy. * **Microcontroller (MCU):** The brain of the unit that processes timing, sensitivity settings, and light level thresholds. --- ### 3. Connection & Wiring Schematic The unit typically uses a standard color-coded wiring system to interface with the power source and the light fixture. | Wire Color | Function | Description | | :--- | :--- | :--- | | **Black** | Line | Input power (120-277V) | | **White** | Neutral | Common return path | | **Red** | Load | Switched power to the LED driver | | **Purple** | Dim (+) | 0-10V positive control signal | | **Pink/Gray** | Dim (-) | 0-10V negative control signal | --- ### 4. Operational Modes The electronics are programmed to support three primary states: 1. **High Mode:** Triggered when motion is detected; the 10V signal provides full brightness. 2. **Low Mode:** After a period of inactivity (Time Delay), the signal drops (e.g., to 3V) to dim the light. 3. **Off Mode:** If no motion is detected for an extended period (Cut-off), the internal relay opens, cutting power to the driver. ---