IOT-C101 is a compact industrial serial device server that converts RS232 and RS485 to Ethernet. It supports Modbus RTU/TCP protocol conversion, multiple communication modes (TCP/UDP/HTTP/MQTT/WebSocket), and simultaneous dual-port operation. With a wide 5–36V power input range, -40°C to 85°C temperature tolerance, and built-in web management, it ensures stable and secure data transmission for industrial automation, remote monitoring, and IoT applications.