HLK RM04 UART to Serial Wifi Ethernet Wifi Module

HLK RM04 UART to Serial Wifi Ethernet Wifi Module 

The HLK-RM04 is a versatile UART-to-Wi-Fi and Ethernet networking module designed to add wireless or wired network connectivity to serial devices. It allows transparent data transmission between a UART serial interface and Wi-Fi or RJ45 Ethernet, enabling legacy serial equipment to communicate over modern IP networks without changing existing firmware. The module integrates a complete TCP/IP stack and supports multiple network working modes, making it suitable for embedded systems, industrial control, and IoT applications.

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Features

• UART to Wi-Fi / Ethernet conversion — bridges serial devices to IP networks
• Supports Wi-Fi and RJ45 Ethernet — flexible wired or wireless connectivity
• Transparent data transmission — no protocol modification required
• Multiple network modes — TCP server, TCP client, UDP communication
• Wi-Fi modes — Station (Client), Access Point (AP), and Router mode
• Configurable via AT commands or web interface
• Wide baud rate support — compatible with many serial devices
• Built-in TCP/IP stack — simplifies network integration
• Network security support — Wi-Fi encryption and authentication
• Compact embedded module design — suitable for PCB integration

Applications

• Serial device networking (UART to Wi-Fi / Ethernet)
• Industrial automation and control systems
• Remote monitoring and data acquisition
• IoT gateways and embedded networking
• Legacy equipment network upgrades
• Smart home and building automation
• Communication interfaces for microcontrollers