The **M2REB-SA11-R/N** is a specific model of a **Rotary Encoded Switch** (often referred to as a binary coded rotary DIP switch), typically manufactured by companies like Copal Electronics (Nidec) or similar electronic component providers. These parts are used to set configurations or addresses on a circuit board manually. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Rotary Coded Switch | | **Output Code** | Binary Coded Decimal (BCD) | | **Number of Positions** | 10 Positions (0-9) | | **Actuator Type** | Shaft Type (Rotatable knob/shaft) | | **Mounting Type** | Through-hole (PCB Mount) | | **Terminal Layout** | Right Angle (Side-actuated) | | **Contact Rating** | Typically 100mA, 5V DC (Switching) | | **Orientation** | Horizontal / Right Angle | --- ### 2. Functional Breakdown #### A. Binary Coded Decimal (BCD) Logic The "SA11" designation usually indicates the coding logic. In a BCD configuration, the switch has 4 output pins (representing bits 1, 2, 4, and 8) plus a common pin. As you turn the dial: * **Position 0:** All output pins are open. * **Position 1:** Pin 1 is connected to Common. * **Position 9:** Pins 1 and 8 are connected to Common ($1 + 8 = 9$). #### B. Physical Design (R/N Suffix) * **R (Right Angle):** This indicates that the adjustment shaft sits parallel to the PCB, allowing for edge-of-board access. * **N (Non-washable/Standard):** This usually refers to the sealing level. Parts marked 'N' might not be fully sealed for immersion cleaning, whereas 'W' models often are. #### C. Shaft Actuation Unlike flush-mounted DIP switches that require a screwdriver, the **SA11** shaft allows for manual rotation by hand or a small knob, making it ideal for user-accessible settings. --- ### 3. Application Use Cases 1. **Address Setting:** Setting the unique ID for a device on a bus (like RS-485 or CAN bus). 2. **Mode Selection:** Choosing between different operating firmware modes (e.g., Test Mode vs. Normal Mode). 3. **Frequency Tuning:** Selecting preset channels on radio or communication equipment. --- ### 4. Typical Internal Circuit (Simplified) ```text [ Common ] | ----------------- | | | | | (1) (2) (4) (8) [Output Pins] ``` ---