Sunix universal PCI Multi-port serial card provides RS-232 Serial connection ports on your system for your application needs. The 4056 card series works on both 32-bit and 64-bit PCI Bus with 3.3V or 5V power, allowing this multi-port serial card to be installed in virtually any PC system and compatible with all major operating systems. The card supports multi independent RS-232 ports, with each port transfer data up to 921.6 Kbps. Sunix universal PCI Multi-port serial cards is the best solution for various industrial communication and automation applications.