Features 1、Two (2) 9-pin RS-232 serial ports. 2、PCI Express x1 interface (will also work on PCI-E x4, x8, x16 slot). 3、Compliant with PCI Express Specification Revision 1.1. 4、PCI Express single-lane (x1) bus bandwidth 2.5 Gbps. 5、Support DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating systems. Specification Description: This PCI Express serial card, is specially designed for POS and ATM applications. The product with WCH382L chip supports a variety of mainstream operating systems, including Windows and Linux. In addition, the extended 2 rs-232 serial ports can support the communication rate of 230.4 Kbps, and provide modem control signals to ensure compatibility with all kinds 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 (will also work on PCI-E x4, x8, x16 slot). Compliant with PCI Express Specification Revision 1.1. PCI Express single-lane (x1) bus bandwidth 2.5 Gbps. Support DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating systems. Serial Interface (RS232): Comply with industrial standard 16C450/16C550 UART On-Chip 256-bit depth FIFOs in Transmit, support H/W, S/W flow control Data transmission rate of each serial port can be up to 250Kbps Baud rate: 230.4 Kbps Serial communication parameter data 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 the BIOS IRQ: Distributed by the 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 Systems: Support DOS, Windows 8/7 / Vista/XP / 2000 / Server 2003-2008 32/64-bit, Linux operating systems. Package weight: 101g Package Included: 1x PCI-E to Dual Serial Port Controller Card 1 x Drive CD