Realize bidirectional data transmission between RS232 or RS485 and Wi-Fi or Ethernet. Supports Modbus gateway function, including Modbus multi-host polling and conversion between Modbus RTU and Modbus TCP. Full coverage of transparent transmission protocols: TCP, UDP, HTTP, MQTT. Data security features include transmission encryption and two-way certificate verification for TCP, HTTP, and MQTT protocols. Offers multiple Wi-Fi modes: AP, STA, AP+STA, bridging, and routing. Network standards: IEEE 802.11b/g/n. Network transfer rate: 54 Mbps for 11g, 72.2 Mbps for 11n. Interface: RS485. UART working modes: TCP server, TCP client, UDP, Modbus TCP/IP, MQTT. Baud rate: 600 bps to 230400 bps. Data bits: 7, 8. Parity: None, odd, even. Stop bits: 1, 2. Indicator lights for power supply and Wi-Fi. Power supply: DC 6V–30V. Power consumption: Less than 0.7W. Operating temperature: -40°C to 85°C. Storage temperature: -40°C to 85°C. Humidity: 10%–90%, non-condensing. Dimensions: 68.8 x 41.4 x 25 mm. Product appearance and printed text may vary by batch, but this does not affect functionality. Color: As shown. Material: Plastic. Package contents: 1 x Wi-Fi Serial Server. Only the listed items are included; other products are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowance: +/- 1–3 cm.