### Overview of the HRS-16-R The **HRS-16-R** typically refers to a high-performance **Rotary Selector Switch** or a specific **Electromechanical Relay** series, depending on the manufacturer (most commonly associated with **Hartland Controls/Littelfuse** or **HDK**). Below is a breakdown of the electronic specifications and characteristics based on the standard 16-position rotary switch/relay configuration common to this part number. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Rotary Coding Switch / Selector | | **Positions** | 16-Step (Hexadecimal) | | **Voltage Rating** | 24V DC to 50V DC (Standard Logic Level) | | **Current Rating** | 100mA (Switching), 400mA (Non-switching/Carry) | | **Contact Resistance** | < 100 mΩ | | **Insulation Resistance** | > 1,000 MΩ at 250V DC | | **Operating Temperature** | -25°C to +75°C | --- ### Key Electronic Components & Design #### 1. Contact Material The "R" in the suffix often denotes **RoHS compliance** or **Real Code** (Binary Coded Hexadecimal). The internal contacts are usually **Gold-plated** to prevent oxidation, ensuring signal integrity even in low-current logic circuits. #### 2. Coding Logic The HRS-16-R is designed to convert mechanical rotation into a digital output. * **Hexadecimal Output:** It provides a 4-bit binary output (1, 2, 4, 8) representing positions 0 through F. * **Terminal Layout:** Typically features 5 pins (1 Common pin + 4 Data bits). #### 3. Actuation Style * **Internal Rotor:** A spring-loaded detent mechanism provides tactile feedback for each of the 16 positions. * **Rotor Type:** Usually a "Flat" or "Cross" type actuator, requiring a screwdriver or a small knob to adjust. --- ### Common Applications Due to its 16-position nature and small footprint, the HRS-16-R is used for: * **Address Setting:** Assigning IDs to devices on a communication bus (e.g., RS-485 or CAN bus). * **Mode Selection:** Choosing between different firmware presets in embedded systems. * **Industrial Controls:** Setting timers or frequency ranges on HVAC or motor control boards. --- ### Circuit Example (Typical) To use this in a microcontroller circuit (like Arduino or ESP32), the wiring usually follows this pattern: ```cpp // Logic Diagram [Common Pin] ----> GND [Bit 1 (1)] ----> Digital Input (Pull-up) [Bit 2 (2)] ----> Digital Input (Pull-up) [Bit 3 (4)] ----> Digital Input (Pull-up) [Bit 4 (8)] ----> Digital Input (Pull-up) ``` *When the switch is at position '3', Bits 1 and 2 will be pulled to Ground (Logic 0), while Bits 3 and 4 remain High (Logic 1).*