The HMIG3U is a premium box base unit within the Harmony GTU range, serving as a controller for HMI systems. It is powered by a 600 MHz RISC CPU and features 256 MB of internal RAM, 512 KB of NVRAM for backup memory, and a 1 GB SD card for data storage. The unit provides extensive connectivity with two Ethernet TCP/IP ports, multiple serial communication ports (RS485, RS232C, RS422), and several USB 2.0 ports. Operating on a 12 to 24 V DC supply, it is built to function in ambient temperatures from 0°C to 60°C. These features make the HMIG3U a robust and versatile solution for advanced control and monitoring tasks in various industrial environments.