The **HRS-4B-R** typically refers to a specific series of **Rotary DIP Switches** or high-reliability electromechanical components, often manufactured by companies like Hartmann (a Phoenix Mecano brand) or similar electronic part suppliers. Below is a detailed breakdown of its electronic characteristics and specifications. --- ## 1. Technical Specifications The HRS-4B-R is designed for PCB mounting to provide binary-coded inputs to a circuit. | Feature | Specification | | :--- | :--- | | **Type** | Rotary DIP Switch | | **Coding** | Binary Coded Decimal (BCD) or Hexadecimal | | **Positions** | 10 (BCD) or 16 (Hex) depending on sub-model | | **Mounting Type** | Through-hole (THT) | | **Actuator Type** | Recessed Slot (Arrow-shaped) | | **Contact Rating** | 100mA @ 50V DC (Static) / 100mA @ 5V DC (Switching) | | **Life Cycle** | ~10,000 to 20,000 Steps | --- ## 2. Pin Configuration and Logic These parts are "4-bit" encoders. They convert a physical rotational position into a logic signal that a microcontroller can read. ### Pinout Structure 1. **Common (C):** The input voltage source (usually VCC or GND). 2. **Bit 1 (2^0):** Least Significant Bit (Value: 1). 3. **Bit 2 (2^1):** (Value: 2). 4. **Bit 4 (2^2):** (Value: 4). 5. **Bit 8 (2^3):** Most Significant Bit (Value: 8). --- ## 3. Key Features * **Gold-Plated Contacts:** Ensures high reliability and prevents oxidation over long periods of inactivity. * **Sealed Construction:** Usually features an O-ring or potting to withstand wave soldering and board washing processes. * **Compact Footprint:** Designed to save space on crowded Printed Circuit Boards (PCBs). * **"R" Suffix:** Often denotes "Real Code" (where the output logic matches the physical number) versus "Complement Code." --- ## 4. Application Examples * **Address Setting:** Used in industrial networking (like RS-485 or CAN bus nodes) to set a unique ID for a device. * **Mode Selection:** Choosing between different firmware operation modes without needing a digital display or interface. * **Configuration:** Setting baud rates or hardware parameters on embedded systems. --- ## 5. Circuit Integration Example To use the HRS-4B-R with an Arduino or MCU, you would typically use pull-up resistors: ```cpp // Example: Reading a 4-bit Rotary Switch int pin1 = 2; // Bit 1 int pin2 = 3; // Bit 2 int pin4 = 4; // Bit 4 int pin8 = 5; // Bit 8 void setup() { pinMode(pin1, INPUT_PULLUP); pinMode(pin2, INPUT_PULLUP); pinMode(pin4, INPUT_PULLUP); pinMode(pin8, INPUT_PULLUP); } ```