The IOT-C104 is an industrial 4-port RS485 to Ethernet converter for connecting Modbus RTU devices to IP networks. It supports Modbus RTU/TCP conversion, serial-to-MQTT/JSON data processing, and multiple protocols like TCP, UDP, and HTTP. With a rugged IP30 design, wide 5–36V DC input, -40°C to 85°C temperature range, and TLS encryption, it ensures reliable operation in harsh environments.