The **T2R1-R** typically refers to a specific series of **Rotary Dip Switches** or micro-miniature selector switches commonly used in industrial automation, telecommunications, and PCB design. These components are designed to manually set binary or hexadecimal codes. Below is a detailed breakdown of the electronic parts and specifications for the T2R1-R series. --- ### 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Switch Type** | Rotary Coded DIP Switch | | **Mounting Type** | Surface Mount (SMT) or Through-Hole (depending on sub-model) | | **Positions** | Usually 10 (0-9) or 16 (0-F) positions | | **Actuator Style** | Recessed or Raised (Flush arrow) | | **Contact Rating** | 100mA, 50V DC (Non-switching) / 100mA, 5V DC (Switching) | | **Operating Force** | 200gf to 500gf.cm | --- ### 2. Internal Electronic Construction The "R" in the suffix usually denotes **Real Code** (standard binary), while an "C" would denote Complementary Code. The T2R1-R consists of several critical internal parts: #### A. The Rotor (Actuator) The rotating part allows the user to select a position using a screwdriver or manual dial. It is usually made of heat-resistant plastic (such as LCP) to withstand reflow soldering temperatures. #### B. Contact Plating * **Wiping Action:** As the rotor turns, gold-plated contacts "wipe" across the internal circuit board. * **Gold over Nickel:** Most T2R1-R models use gold plating to prevent oxidation and ensure a low contact resistance (< 100mΩ). #### C. The Base and Terminals * **Terminals:** Lead-frame pins (often 4 to 6 pins) that provide the Binary Coded Decimal (BCD) or Hexadecimal output. * **Sealing:** The T2R1-R series is often **process-sealed** (O-ring or epoxy), allowing it to be washed after soldering without damaging the internal contacts. --- ### 3. Truth Table (Binary Output) The electronic logic follows a standard binary pattern. When the dial is set to a number, specific pins are connected to the "Common" (C) pin. | Position | Pin 1 (1) | Pin 2 (2) | Pin 3 (4) | Pin 4 (8) | | :--- | :--- | :--- | :--- | :--- | | **0** | OFF | OFF | OFF | OFF | | **1** | ON | OFF | OFF | OFF | | **5** | ON | OFF | ON | OFF | | **9** | ON | OFF | OFF | ON | --- ### 4. Common Applications * **Address Setting:** Used in RS-485 or CAN bus nodes to set a unique ID. * **Mode Selection:** Used on motherboards or industrial PLCs to choose between different software operating modes. * **Configuration:** Adjusting hardware parameters without needing a digital interface. ---