The **WMS2-C3-R** is a specific model within the **WMS series** of high-performance wireless bridge and serial-to-Wi-Fi communication modules. These components are primarily used in industrial automation for transparent data transmission between RS-232/RS-485 interfaces and Wi-Fi networks. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Wireless Standard** | IEEE 802.11 b/g/n | | **Interface Type** | RS-232 / RS-485 (Configurable) | | **Input Voltage** | Typically 5V to 36V DC | | **Frequency Range** | 2.412GHz - 2.484GHz | | **Working Mode** | TCP Server/Client, UDP Server/Client, HTTPD Client | | **Security** | WEP/WPA-PSK/WPA2-PSK | | **Antenna Connector** | SMA-K (External antenna support) | --- ### 2. Core Electronic Components The internal architecture of the WMS2-C3-R typically consists of several critical subsystems: #### A. Microcontroller (MCU) & Wi-Fi SoC The heart of the module is an integrated SoC (System on Chip) that handles the networking stack (TCP/IP) and the conversion logic. It manages the buffer for serial data and converts it into wireless packets. #### B. Serial Interface Driver * **RS-232/485 Transceiver:** Since internal logic levels are usually 3.3V, the module includes level-shifter ICs (like the MAX3232 for RS-232) to ensure compatibility with industrial serial ports. * **Isolation:** High-end versions often include optocouplers or magnetic isolation to protect the circuitry from voltage surges on the serial line. #### C. Power Management Unit (PMU) Because industrial environments use varied power sources, the WMS2-C3-R includes a wide-voltage buck regulator. This converts input (e.g., 24V) down to the 3.3V required by the Wi-Fi chip efficiently, minimizing heat. #### D. RF Frontend This includes the power amplifier (PA) for transmission and the low-noise amplifier (LNA) for reception, leading to the SMA connector for the external antenna. --- ### 3. Functional Pinout/Port Layout | Port/Part | Description | | :--- | :--- | | **VCC/GND** | Power input pins. | | **RXD/TXD** | Serial data receive/transmit pins. | | **Reload/Reset** | Hardware button/pin to restore factory settings. | | **Link/Data LEDs** | Visual indicators for Wi-Fi connection and data throughput. | --- ### 4. Common Use Cases * **PLC Programming:** Wireless monitoring and programming of PLCs (Programmable Logic Controllers) on a factory floor. * **Data Acquisition:** Connecting RS-485 sensors (temperature, pressure) to a central cloud server via Wi-Fi. * **Remote Management:** Accessing console ports of legacy equipment that lack native ethernet or Wi-Fi.