The **RTF-16-R2AR** is an industrial-grade rotary coded switch, typically used for circuit configuration, address setting, or mode selection on PCBs (Printed Circuit Boards). It belongs to the RTF series, known for its compact size and high reliability. --- ### 1. Key Technical Specifications Below are the primary electronic and mechanical characteristics of the RTF-16-R2AR: | Parameter | Specification | |:---|:---| | **Code Type** | Real Binary Coded Hexadecimal (0-F) | | **Number of Positions** | 16 Positions | | **Actuator Style** | Arrow Level (Recessed/Flush) | | **Mounting Type** | Through-hole (DIP) | | **Terminal Layout** | 3x3 (Standard pitch) | | **Contact Rating** | 100mA, 50V DC (Switching); 400mA (Non-switching) | | **Contact Resistance** | 100mΩ Max | | **Insulation Resistance** | 1,000MΩ Min at 250V DC | --- ### 2. Functional Details #### Binary Coding Logic The "R2AR" designation indicates a **Real Code** (Binary Coded Hexadecimal). As you rotate the dial from 0 to F, the internal metal contacts bridge specific pins to the "Common" pin to create a 4-bit binary output ($2^0, 2^1, 2^2, 2^3$). #### Physical Construction * **Housing:** High-temperature liquid crystal polymer (LCP) or PBT plastic, designed to withstand wave soldering. * **Contacts:** Gold-plated contacts to prevent oxidation and ensure stable signal transmission even in low-voltage logic circuits. * **Sealing:** Usually features an O-ring or molded construction to be "washable," meaning it can survive PCB cleaning processes after soldering. --- ### 3. Pinout and Integration The device typically features 6 pins (though layouts vary by specific sub-series): 1. **Common (C):** The input signal or ground. 2. **Bit 1 (1):** $2^0$ (Value of 1) 3. **Bit 2 (2):** $2^1$ (Value of 2) 4. **Bit 4 (4):** $2^2$ (Value of 4) 5. **Bit 8 (8):** $2^3$ (Value of 8) #### Example Logic Table (Simplified) | Position | Binary Output (8-4-2-1) | |:---:|:---:| | 0 | 0000 | | 5 | 0101 | | A (10) | 1010 | | F (15) | 1111 | --- ### 4. Typical Applications * **Industrial Controls:** Setting Modbus or CAN bus node IDs. * **Networking:** Configuring hardware addresses on routers or switches. * **Embedded Systems:** Selecting operating modes (e.g., Test Mode vs. Production Mode) without needing a digital interface.