The **M2RT-16-R2/K** is a high-precision, industrial-grade **Rotary Coded Switch** (often referred to as a binary coded DIP switch). These components are primarily used to set addresses, configurations, or operating modes on printed circuit boards (PCBs) without requiring a digital interface. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Output Code** | Real Binary (Hexadecimal) | | **Number of Positions** | 16 (0 through F) | | **Actuator Type** | Screwdriver Slot (Flat/Cross) | | **Mounting Type** | Through-hole (THT) | | **Contact Rating** | 100mA @ 5V DC (Switching) / 100mA @ 50V DC (Steady) | | **Contact Resistance** | < 100 mΩ | | **Operating Temp** | -25°C to +75°C | --- ### 2. Electronic Functionality The M2RT-16-R2/K acts as a 4-bit digital encoder. When the dial is turned to a specific number or letter (0-F), it mechanically closes a combination of four internal switches to represent that value in binary. #### Truth Table (Logic Output) | Dial Position | Hex Value | Bit 1 (1) | Bit 2 (2) | Bit 3 (4) | Bit 4 (8) | | :--- | :--- | :--- | :--- | :--- | :--- | | **0** | 0 | OFF | OFF | OFF | OFF | | **1** | 1 | **ON** | OFF | OFF | OFF | | **9** | 9 | **ON** | OFF | OFF | **ON** | | **F** | 15 | **ON** | **ON** | **ON** | **ON** | --- ### 3. Physical & Material Composition * **Housing:** Typically made of high-temperature PBT (Polybutylene terephthalate) or Liquid Crystal Polymer (LCP) to withstand wave soldering. * **Contacts:** Gold-plated contacts are used to prevent oxidation and ensure high signal integrity over the component's lifespan. * **R2 Designation:** This usually refers to the specific terminal pitch or the physical orientation (e.g., right-angle vs. vertical), though in the M2RT series, it often denotes a standard **3x3 terminal layout**. * **K Suffix:** Generally indicates that the part is "Sealed" (Washable), meaning it has an internal O-ring or top tape to protect against flux during the cleaning process after soldering. --- ### 4. Common Applications * **Industrial Automation:** Setting the unique ID for a PLC (Programmable Logic Controller) node on a fieldbus network. * **Telecommunications:** Configuring frequency bands or channel offsets on radio equipment. * **Security Systems:** Setting hard-coded zones or user IDs on control panels. ---