The **2RT-16-R2** is a specific model of a **Rotary DIP Switch** (Dual In-line Package). These components are used to manually set binary or hexadecimal values on a circuit board by rotating a central dial. --- ## 1. Technical Specifications The 2RT series is typically manufactured by brands like **Copal Electronics** or **Nidec**. Below are the standard specifications for this specific model: | Parameter | Specification | | :--- | :--- | | **Type** | Rotary DIP Switch | | **Positions** | 16 (Hexadecimal: 0-9, A-F) | | **Output Code** | Real Code (Binary Coded Decimal/Hex) | | **Actuator Style** | Recessed (Screwdriver slot) | | **Mounting Type** | Through-hole (PCB) | | **Contact Rating** | 100mA @ 5V DC (Switching), 100mA @ 50V DC (Non-switching) | | **Terminal Pitch** | 2.54mm (0.1 inch) | --- ## 2. Key Components & Construction ### A. The Actuator The "16" in the part number indicates it has 16 distinct positions. It is adjusted using a flat-head screwdriver. Each position corresponds to a specific combination of "ON" and "OFF" states across four output pins. ### B. The Code (Binary Coded Hexadecimal) When you turn the dial, the internal contacts bridge the "Common" pin to different output pins (1, 2, 4, 8). * **Position 0:** All pins OFF. * **Position 7:** Pins 1, 2, and 4 are ON ($1+2+4=7$). * **Position F (15):** All pins 1, 2, 4, and 8 are ON ($1+2+4+8=15$). ### C. Sealing and Durability * **R2 Designation:** Usually refers to the packaging or a specific revision involving environmental sealing (washable), allowing the PCB to be cleaned after soldering without damaging the switch internals. --- ## 3. Applications These parts are commonly found in industrial and computing hardware where permanent settings are required but must be changeable by a technician: * **Address Setting:** Assigning a unique ID to a device on a BUS (like RS-485 or CAN bus). * **Mode Selection:** Choosing between different firmware operating modes. * **Configuration:** Setting baud rates or communication protocols on legacy hardware. --- ## 4. Pinout Diagram (Top View) The layout generally follows a standard 3x2 or 4x1 grid: ```text [ 8 ] [ C ] [ 1 ] [ 4 ] [ C ] [ 2 ] (C = Common, numbers represent bit values) ```