2-port DB-9 Serial (RS-232) PCI-e Controller Card,WCH382 Chipset Specifacation WCH382 Chipset Fully Compliant with PCI-Express Base Specification, Revision 1.0a PCIe Multi Function Peripheral Controller with x1 Lane Interface Support for D1, D2, D3hot and D3cold Supports PCIe Power Management Serial Ports: 16C450/550/Extended 550 Compatible UARTs Supports RS232, RS485 & RS422 Modes Bi-directional Speeds from 50 bps to 16Mbps/Port Full Serial Modem Control Supports Hardware, Software Flow Control 5, 6, 7, 8 and 9-bit Serial Format Supported Even, Odd, None, Space & Mark Parity Supported On Chip 256 Byte Depth FIFOs in Transmit, Receive Path of Each Serial Port Supports Remote Wake-up and Power Management Features Serial Port Transceiver Shutdown Supported Package Includes 2-port Serial PCI-Express Card CD Driver User Manual Software requirement Windows 7 32/64-bit Vista 32/64-bit Windows XP 32/64-bit Windows 2000/Windows 10 Linux Kernel 2.6.11 & Above Mac 10.4 & Above