The **BH4DT-R** is a specific electronic component, primarily known as a **Rotary DIP Switch** manufactured by companies like **Otax** or available through various electronic distributors. These parts are used to set configurations or addresses on printed circuit boards (PCBs). --- ### Technical Specifications | Feature | Description | | :--- | :--- | | **Component Type** | Rotary DIP Switch | | **Model Series** | BH4 Series | | **Actuator Style** | Flat Type (Flush) / Screwdriver slot | | **Number of Positions** | 10 Positions (0-9) | | **Output Code** | BCD (Binary Coded Decimal) | | **Mounting Type** | Through-hole (THT) | | **Terminal Pitch** | 2.54mm (Standard) | --- ### Key Electronic Characteristics 1. **BCD Coding**: This part converts a rotary position into a 4-bit binary output. When you turn the dial to "3", the output pins will represent the binary value for 3 (0011). 2. **Contact Rating**: Usually rated for low voltage/current (e.g., 100mA at 5V DC or 25mA at 24V DC). It is a signal-level switch, not intended for power switching. 3. **Durability**: Designed for long-term reliability with gold-plated contacts to prevent oxidation in industrial environments. 4. **The "R" Suffix**: Often denotes the packaging style (such as **Reel** or specific **RoHS** compliance/Right-angle variants depending on the specific manufacturer catalog). --- ### Typical Applications * **Address Setting**: Used in RS-485 or CAN bus nodes to manually assign a device ID (0-9). * **Mode Selection**: Configuring hardware operation modes (e.g., selecting between different sensor sensitivities). * **Industrial Controls**: Used on PLCs or industrial motherboards where software-independent settings are required for safety or setup. --- ### Pin Configuration (Standard BCD) | Pin No. | Function | | :--- | :--- | | **C** | Common Terminal | | **1** | Bit 1 ($2^0$) | | **2** | Bit 2 ($2^1$) | | **4** | Bit 4 ($2^2$) | | **8** | Bit 8 ($2^3$) |