Sunix universal PCI Multi-port serial card provides RS-422/485 Serial connection ports on your system for industrial communication and automation applications. The 8139 card 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-422 or RS-485 ports, with each port transfer data up to 921.6 Kbps and able to control device in a multi-drop mode. Furthermore, Isolation and Surge protection (optional) can protect your equipment and controller from being damaged by static electrical charge and high energy spike. Sunix ARSCTM (Auto RTS Signal Control) technology provides the best way to make half-duplex RS-485 auto data transmission and receiving without software or writing extra code. In addition, Sunix RS-422/485 Auto Identify & Switch technology allows users the convenience of changing between RS-422 and RS-485 devices without jumper or switch setting. Sunix universal PCI Multi-port serial card is the best solution for various industrial communication and automation applications.