The **HRS-33-R** is a specific type of **Rotary Coded Switch** (often referred to as a binary coded rotary switch). These components are commonly used in industrial electronics, telecommunications, and control panels to set parameters or addresses manually. --- ### 1. Technical Specifications The HRS-33-R is generally characterized by its miniature size and its ability to output a specific binary code based on the position of the dial. | Feature | Specification (Typical) | | :--- | :--- | | **Type** | Rotary Coded Switch | | **Output Code** | Binary Coded Decimal (BCD) or Hexadecimal | | **Positions** | 10 Positions (0-9) or 16 Positions (0-F) | | **Switching Rating** | 100mA, 5V DC (Non-switching: 100mA, 50V DC) | | **Terminal Type** | Through-hole (PCB Mount) or Surface Mount (SMD) | | **Actuator Style** | Arrow/Slot type (requires a screwdriver or tool) | | **Contact Resistance** | 100mΩ Max | --- ### 2. Physical Construction The "HRS" series usually follows a standard footprint for integration into printed circuit boards (PCBs). * **R-Suffix:** The "R" in the part number often denotes **Real Code** (where the output logic matches the dial position) or a specific **Reflow-compatible** material. * **Housing:** Usually made of heat-resistant plastic (PBT or Liquid Crystal Polymer) to withstand soldering. * **Sealing:** Most units are "process sealed" (using an O-ring or epoxy) to allow for wave soldering and board washing without damaging the internal contacts. --- ### 3. Pin Configuration and Logic The device typically has 4 to 6 pins. In a standard BCD (Binary Coded Decimal) setup: * **Common (C):** The input pin connected to the voltage source or ground. * **1 (2^0):** Least Significant Bit (LSB). * **2 (2^1):** Second Bit. * **4 (2^2):** Third Bit. * **8 (2^3):** Most Significant Bit (MSB). #### Logic Table Example (BCD): | Dial Position | Pin 1 | Pin 2 | Pin 4 | Pin 8 | | :--- | :--- | :--- | :--- | :--- | | **0** | Open | Open | Open | Open | | **1** | Closed| Open | Open | Open | | **3** | Closed| Closed| Open | Open | | **9** | Closed| Open | Open | Closed| --- ### 4. Common Applications 1. **Address Setting:** Used in RS-485 or CAN bus modules to give a specific ID to a device on a network. 2. **Mode Selection:** Selecting different operating modes in an embedded system without needing a digital UI. 3. **Configuration:** Setting baud rates or frequency channels on radio or communication equipment.