The **4BV-R** typically refers to a specific series of **Rotary DIP Switches** manufactured by companies like *Hartmann* or other electronic component specialists. These parts are used to manually set binary or hexadecimal values on a circuit board. --- ### 1. Technical Specifications The "4BV-R" designation usually identifies the mechanical configuration and the number of positions. | Feature | Description | | :--- | :--- | | **Component Type** | Rotary DIP Switch | | **Switching Logic** | Binary Coded Decimal (BCD) or Hexadecimal | | **Mounting Type** | Through-hole (THT) or Surface Mount (SMD) | | **Number of Positions** | Typically 10 (0-9) or 16 (0-F) | | **Actuator Style** | Arrow-shaped slot / Flush or Raised | | **Contact Plating** | Usually Gold-plated for high reliability | ### 2. Physical Characteristics - **Dimensions:** These are "Sub-miniature" parts, often measuring around 7mm x 7mm or 10mm x 10mm. - **Housing:** Usually made of high-temperature resistant plastic (PPS or LCP) to withstand soldering processes. - **Terminal Layout:** The "4" in the prefix often denotes 4 output pins + 1 common pin (representing a 4-bit nibble). ### 3. Pinout & Logic Table (BCD Example) In a standard 4-bit rotary switch, the pins represent powers of 2 (1, 2, 4, 8). | Position | Pin 1 (2⁰) | Pin 2 (2¹) | Pin 4 (2²) | Pin 8 (2³) | | :--- | :--- | :--- | :--- | :--- | | **0** | OFF | OFF | OFF | OFF | | **1** | **ON** | OFF | OFF | OFF | | **5** | **ON** | OFF | **ON** | OFF | | **9** | **ON** | OFF | OFF | **ON** | ### 4. Common Applications * **Address Setting:** Used in industrial BUS systems (like RS-485 or CAN bus) to set the unique ID of a device on a network. * **Configuration:** Selecting operating modes on a PCB without needing a digital interface. * **Peripheral Identification:** Setting SCSI IDs or printer server configurations. ### 5. Part Number Breakdown (Typical) While manufacturers vary, the code usually breaks down as follows: * **4:** 4-bit output (Binary/Hex). * **B:** BCD or Binary coding style. * **V:** Vertical orientation (top-actuated). * **R:** "Real" code (as opposed to "Complementary" code). ---