The **M2UDS-16-R/N** is a specific type of **Rotary DIP Switch** (Dual In-line Package switch) commonly used in industrial electronics for setting configurations, addresses, or modes on a printed circuit board (PCB). Below is a detailed breakdown of its electronic parts and specifications. --- ### 1. General Specifications The part number indicates specific characteristics regarding its positions, output code, and physical orientation. | Feature | Specification | | :--- | :--- | | **Switch Type** | Rotary DIP Switch | | **Number of Positions** | 16 (Hexadecimal: 0-9, A-F) | | **Actuator Style** | Upper Surface (Flush or Shaft) | | **Output Code** | Binary Coded Hexadecimal (BCH) / Complement | | **Mounting Type** | Through-hole or Surface Mount (model dependent) | | **Voltage Rating** | Usually 24V DC to 50V DC | | **Current Rating** | Switching: 25mA to 100mA | --- ### 2. Key Internal Components The electronic functionality of the M2UDS-16-R/N is driven by its internal mechanical and conductive architecture: * **Rotor (The Dial):** The top part that the user rotates. It houses a conductive wiper that bridges specific internal traces to create binary outputs. * **Housing:** Typically made of high-temperature liquid crystal polymer (LCP) or PBT plastic to withstand soldering temperatures. * **Wiper Contacts:** Usually gold-plated or silver-plated phosphor bronze to ensure low contact resistance and prevent oxidation. * **Terminals (Pins):** These are the physical leads that connect to the PCB. In a 16-position switch, there are typically 6 pins (1 Common pin, and 4 Output pins for bits $2^0, 2^1, 2^2, 2^3$, plus an optional ground or second common). --- ### 3. Truth Table (Binary Logic) Since this is a 16-position switch, it uses 4 bits to represent the state. When the dial is turned to a specific digit, the internal contacts close to represent that number in binary. | Position | Pin 1 ($2^0$) | Pin 2 ($2^1$) | Pin 4 ($2^2$) | Pin 8 ($2^3$) | | :--- | :--- | :--- | :--- | :--- | | **0** | OFF | OFF | OFF | OFF | | **1** | **ON** | OFF | OFF | OFF | | **5** | **ON** | OFF | **ON** | OFF | | **9** | **ON** | OFF | OFF | **ON** | | **F** | **ON** | **ON** | **ON** | **ON** | --- ### 4. Circuit Implementation When integrating this part into a circuit, designers typically use **Pull-up Resistors**. ```cpp // Typical Hardware Logic: // VCC --- [Resistor] --- Input Pin --- Switch --- GND // When Switch is OFF: Input Pin reads HIGH (1) // When Switch is ON: Input Pin reads LOW (0) ``` ### 5. Part Number Suffix Breakdown * **-16**: Indicates 16 distinct detent positions. * **-R**: Often refers to the "Real Code" (Output matches the position). * **-N**: Usually indicates a standard package or non-sealed variant (though this varies by specific manufacturer like Nidec or Omron). ---