The **M2RT-04-R2** is a specific model within the **M2RT series** of rotary DIP switches, typically manufactured by companies like **Copale (Nidec)**. These components are designed for PCB mounting and are used to set binary or decimal configurations manually. --- ### 1. General Specifications This part belongs to the sub-miniature rotary switch category, known for high reliability and space-saving design. | Parameter | Specification | | :--- | :--- | | **Switch Type** | Rotary DIP Switch | | **Number of Positions** | 4 Positions (Real Code) | | **Actuator Style** | Recessed (Screwdriver slot) | | **Contact Rating** | 100mA at 5V DC (Switching), 100mA at 50V DC (Non-switching) | | **Terminal Type** | Through-hole (PC Pin) | | **Operating Temperature** | -25°C to +70°C | --- ### 2. Electronic Architecture The "04" in the part number indicates the logic configuration. In the M2RT-04, the internal logic is usually simplified for specific logic selection. * **Logic Output:** It typically provides a binary-coded output or a simple 1-of-4 selection depending on the internal trace layout. * **Contact Mechanism:** It utilizes a **wiping contact** mechanism. This ensures that the oxidation layer on the metal is "wiped" away during rotation, maintaining low contact resistance over the component's lifespan. * **Sealing:** The "R" in the suffix often denotes a sealed construction (washable), meaning it can withstand wave soldering and subsequent board washing processes without internal contamination. --- ### 3. Circuit Configuration Example The device acts as a manual interface to a microcontroller or logic circuit. Below is a conceptual representation of how it interfaces with a system. ```cpp // Typical logic implementation for a 4-position DIP switch int readSwitchPosition() { bool bit0 = digitalRead(PIN_A); bool bit1 = digitalRead(PIN_B); // Convert binary pins to a decimal value (0-3) return (bit1 << 1) | bit0; } ``` --- ### 4. Key Applications * **Address Setting:** Setting the ID of a device on a communication bus (like RS-485 or CAN). * **Mode Selection:** Choosing between different operating modes (e.g., Test Mode vs. Normal Mode). * **Configuration:** Adjusting hardware parameters without needing a digital interface or display.