Welcome to our store! 1. Two (2) 9-pin RS-232 serial ports. 2. PCI Express x1 interface (also compatible with PCI-E x4, x8, x16 slots). 3. Compliant with PCI Express Specification Revision 1.1. 4. PCI Express single-lane (x1) bus bandwidth 2.5 Gbps. 5. Supports DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating systems. This serial PCI Express card is specifically designed for POS and ATM applications. The product with WCH382L chip supports a variety of operating systems, including Windows and Linux. Additionally, the two extended 2 RS-232 serial ports support communication speeds of up to 230.4 Kbps and provide modem control signals to ensure compatibility with all types of external serial port devices. Since the card is PCI Express "x1", it can be installed on various PCI Express slots (including 4x 8x16x). Features: • Two (2) 9-pin RS-232 serial ports. • PCI Express x1 interface (also compatible with PCI-E x4, x8, x16 slots). • Compliant with PCI Express Specification Revision 1.1. • PCI Express single-lane (x1) bus bandwidth 2.5 Gbps. • Supports DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating systems. Serial Interface (RS232): • Meets industry standard 16C450/16C550 UART. • On-Chip 256-bit deep FIFO in transmission, supports H/W, S/W flow control. • Data transfer rate for each serial port can be up to 250 Kbps. • Baud rate: 230.4 Kbps. • Serial communication parameters bits: 5, 6, 7, 8. • Stop bit: 1, 2. • Parity: None, Even, Odd, Space, Mark. Flow control: RTS/CTS, XON/XOFF. I/O address: Assigned by BIOS. IRQ: Distributed by BIOS. Serial signal RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND. Specifications: • Chip: WCH382L. • Type: PCI-E to serial interface card. • Interface: 1 x PCI-E, 2 x serial. • Operating system: Supports DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating system. • Package weight: 101g. Package Contents: • 1x PCI-E to Dual Serial Port Controller Card. • 1 x Drive CD.