The **M2RT-10-R2/BL** is a specialized electronic component, typically classified as a **Rotary DIP Switch** or a **Coded Rotary Switch**. These components are widely used in industrial electronics, telecommunications, and circuit board configuration to set binary or decimal values manually. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. General Specifications | Feature | Description | | :--- | :--- | | **Component Type** | Rotary DIP Switch | | **Positions** | 10 Positions (0-9) | | **Output Code** | BCD (Binary Coded Decimal) or Real Code | | **Actuator Style** | Recessed / Flat Arrow (requires screwdriver) | | **Mounting Type** | Through-Hole (THT) / PCB Mount | | **Color Coding** | Blue (indicated by `/BL` suffix) | --- ### 2. Electronic Characteristics The device acts as a mechanical interface that converts the physical position of the dial into a specific electrical output. * **Switching Capacity:** Usually rated at **25mA to 100mA** at **5V to 24V DC**. * **Contact Resistance:** Typically less than **100mΩ** to ensure signal integrity. * **Insulation Resistance:** Usually a minimum of **100MΩ** at 250V DC to prevent cross-talk between pins. * **Dielectric Strength:** Capable of withstanding **250V AC** for one minute. --- ### 3. Binary Coded Decimal (BCD) Truth Table For a 10-position BCD switch, the electronic logic determines which of the 4 output pins (plus a common pin) are connected based on the dial position: | Dial Position | Pin 1 (8) | Pin 2 (4) | Pin 3 (2) | Pin 4 (1) | | :--- | :--- | :--- | :--- | :--- | | **0** | OFF | OFF | OFF | OFF | | **1** | OFF | OFF | OFF | **ON** | | **2** | OFF | OFF | **ON** | OFF | | **3** | OFF | OFF | **ON** | **ON** | | **4** | OFF | **ON** | OFF | OFF | | **5** | OFF | **ON** | OFF | **ON** | | **6** | OFF | **ON** | **ON** | OFF | | **7** | OFF | **ON** | **ON** | **ON** | | **8** | **ON** | OFF | OFF | OFF | | **9** | **ON** | OFF | OFF | **ON** | --- ### 4. Key Physical Features * **Sealability:** Often features an O-ring or epoxy seal to withstand wave soldering and board washing (IP67 rated in some variants). * **Gold-Plated Contacts:** The internal contacts are usually gold-plated to prevent oxidation and ensure long-term reliability in low-current logic circuits. * **Indexing:** Features a positive "click" or detent mechanism to ensure the user feels the transition between numbers. ### 5. Common Applications * **Address Setting:** Configuring the ID of a device on a BUS (like RS-485 or CAN bus). * **Mode Selection:** Choosing between different operating programs in an embedded system. * **Timers/Counters:** Setting numerical values for industrial relay modules.