The **RTF-16-R0SR** is a high-precision, sub-miniature rotary DIP switch manufactured by **Copal Electronics** (now Nidec Components). It is commonly used in industrial controls and communication equipment to set binary addresses or configuration parameters. --- ## Technical Specifications The following table details the core electronic and mechanical parameters of the RTF-16-R0SR: | Parameter | Specification | | :--- | :--- | | **Number of Positions** | 16 (Hexadecimal) | | **Output Code** | Real Code (Binary Coded Hexadecimal) | | **Actuator Style** | Flush Arrow (Screwdriver slot) | | **Contact Rating (Non-Switching)** | 100mA, 50V DC | | **Contact Rating (Switching)** | 100mA, 5V DC | | **Contact Resistance** | 100mΩ Maximum | | **Insulation Resistance** | 1000MΩ Minimum (at 100V DC) | | **Operating Temperature** | -40°C to +85°C | | **Washable** | Yes (Process Sealed) | --- ## Pin Configuration and Logic The device features a 4-pin output plus a common terminal (usually 1 or 2 pins). As a **Real Code** switch, it follows standard binary logic: | Position | Output Pins (1, 2, 4, 8) | Hex Equivalent | | :--- | :--- | :--- | | 0 | 0000 | 0 | | 1 | 1000 | 1 | | ... | ... | ... | | 9 | 1001 | 9 | | 10 | 0101 | A | | 15 | 1111 | F | --- ## Key Features ### 1. Miniature Footprint The "RTF" series is designed for high-density PC board mounting. Its small dimensions (approx. 7mm x 7mm) allow it to be placed in tight spaces on motherboards or sensor modules. ### 2. Process Sealing The **"S"** in the part number indicates a sealed construction (usually an O-ring and heat-resistant resin). This allows the part to undergo automated wave soldering and immersion cleaning without contamination entering the contacts. ### 3. Surface Mount Compatibility The **"R"** indicates a specific lead shape or packaging style (often Tape and Reel or specific SMT lead formation), making it compatible with automated pick-and-place machinery. ### 4. High Reliability The contacts are typically **Gold-plated** to prevent oxidation, ensuring a stable electrical connection even when the switch is not toggled for long periods. --- ## Example Wiring (Pseudo-code logic) If connecting this switch to a microcontroller (e.g., Arduino or ESP32), you would typically use pull-up resistors: ```cpp // Logic for reading a 16-position Hex Switch int pin1 = 2; // Binary 1 int pin2 = 3; // Binary 2 int pin4 = 4; // Binary 4 int pin8 = 5; // Binary 8 void setup() { pinMode(pin1, INPUT_PULLUP); pinMode(pin2, INPUT_PULLUP); pinMode(pin4, INPUT_PULLUP); pinMode(pin8, INPUT_PULLUP); } int readHexSwitch() { // Read pins and invert (since using Pullup) int val = !digitalRead(pin1) + (!digitalRead(pin2) * 2) + (!digitalRead(pin4) * 4) + (!digitalRead(pin8) * 8); return val; } ```