Triple COM port expansion for Shuttle Slim-PC Barebone XH310(R)/XH610 Triple COM Expansion Kit The PCM31 provides three additional RS232 to the front panel, allowing for a Shuttle Slim model to support a max of five serial ports to connect peripheral devices. Purpose Triple COM port expansion for Shuttle Slim PC External Port(s) Triple COM port adapter Support List XH310/XH310V Great Value Versatility | 3-liter 4K PC with Next-Gen Performance XH310R/XH310RV Compact 4K PC with High Scalability for Diverse Applications XH610/XH610V Intel 14th Gen CPU for Maximized Connectivity and AI Computing Performance