The **RG1-403N-R15** is a specific type of **Rotary Coded Switch** (often categorized as a DIP rotary switch) manufactured by companies like **Copal Electronics** (Nidec). These components are used to manually set digital values on a circuit board. --- ### 1. Key Technical Specifications The part number describes the physical and electrical characteristics of the switch: | Feature | Specification | | :--- | :--- | | **Component Type** | Rotary Coded Switch | | **Code Type** | Real Code (Binary Coded Decimal - BCD) | | **Number of Positions** | 10 Positions (0-9) | | **Actuator Style** | Flat / Screwdriver slot (Flush) | | **Terminal Type** | Through-hole (PC Pin) | | **Voltage Rating** | 50V DC (Non-switching) / 5V DC (Switching) | | **Current Rating** | 100mA (Non-switching) / 100mA (Switching) | --- ### 2. Functional Description This part functions as a hardware interface to convert a physical rotation into a 4-bit digital output. * **BCD Logic:** As you turn the dial from 0 to 9, the internal contacts close in specific combinations to represent the number in binary. * **Terminals:** It typically features 5 pins: * **1 Common (C):** The input voltage. * **4 Output Pins (1, 2, 4, 8):** Representing the powers of 2. * **Real Code vs. Complement Code:** This model uses **Real Code**, meaning a "High" signal (1) is sent to the output pins corresponding to the selected number. --- ### 3. Truth Table (Output Logic) For a 10-position BCD Real Code switch, the logic follows this pattern: | Position | Pin 8 | Pin 4 | Pin 2 | Pin 1 | | :---: | :---: | :---: | :---: | :---: | | **0** | OFF | OFF | OFF | OFF | | **1** | OFF | OFF | OFF | **ON** | | **2** | OFF | OFF | **ON** | OFF | | **3** | OFF | OFF | **ON** | **ON** | | **...** | ... | ... | ... | ... | | **9** | **ON** | OFF | OFF | **ON** | --- ### 4. Applications The RG1-403N-R15 is commonly used in industrial and telecommunications equipment for: * **Address Setting:** Setting the unique ID for a device on a bus (e.g., RS-485 or CAN bus). * **Mode Selection:** Choosing between different operational presets (e.g., Baud rate selection). * **Configuration:** Hard-wiring settings that shouldn't be easily changed by an end-user without opening the casing. --- ### 5. Mechanical & Environmental Characteristics * **Washable:** Most "RG" series switches are sealed (O-ring) to allow for wave soldering and board washing without damaging the internal contacts. * **Size:** Compact footprint, usually around 10mm x 10mm. * **Durability:** Rated for approximately 10,000 to 20,000 steps (rotations).