The **CRE16-RRD--S-R** is a specific part number for a **Rotary Coded Switch** manufactured by **Copal Electronics** (now part of Nidec Components). These components are primarily used to set binary values manually on a circuit board, such as setting addresses or modes. --- ### 1. Technical Specifications The part number breaks down into specific physical and electrical characteristics: | Feature | Specification | | :--- | :--- | | **Series** | CRE Series | | **Actuator Type** | Flat / Recessed (requires screwdriver) | | **Output Code** | Real Binary (Binary Coded Decimal - BCD) | | **Number of Positions** | 16 (Hexadecimal: 0-9, A-F) | | **Orientation** | Right Angle (Side-actuated) | | **Terminal Style** | Through-hole (PC Pin) | | **Contact Rating** | 100mA @ 5V DC (Switching), 100mA @ 50V DC (Non-switching) | | **Operating Temp** | -25°C to +70°C | --- ### 2. Physical Design and Dimensions The "RRD" designation indicates the mechanical configuration of the device. * **Right Angle Mount:** The switch is designed to sit perpendicular to the PCB. This allows users to adjust the settings from the edge of the device enclosure. * **Dimensions:** Usually 10mm x 10mm square footprint. * **Seal Structure:** These switches are typically "washable," meaning they are sealed (usually with an O-ring) to withstand wave soldering and board cleaning processes. --- ### 3. Truth Table (Real Binary) Since this is a **16-position** switch with **Real Binary** output, the four output pins represent bits in a 4-bit nibble ($2^0, 2^1, 2^2, 2^3$). | Position | C (Common) | 1 ($2^0$) | 2 ($2^1$) | 4 ($2^2$) | 8 ($2^3$) | | :--- | :--- | :--- | :--- | :--- | :--- | | **0** | Connected | OFF | OFF | OFF | OFF | | **1** | Connected | **ON** | OFF | OFF | OFF | | **7** | Connected | **ON** | **ON** | **ON** | OFF | | **F (15)**| Connected | **ON** | **ON** | **ON** | **ON** | --- ### 4. Key Applications * **Industrial Controls:** Setting Modbus or CAN bus node IDs. * **Telecommunications:** Configuring hardware modes on rack-mounted gear. * **Peripheral Devices:** Selecting SCSI IDs or printer configurations. * **Embedded Systems:** Hard-coding software flags without needing a digital interface. --- ### 5. Part Number Suffix Decoding * **-S-**: Refers to the specific packaging or internal lead-frame style (standard). * **-R**: Typically stands for **RoHS Compliant** (lead-free) or designates the packaging type (like Tube or Tray). ---