This is a PCI Express2 serial port card designed for POS and ATM applications, and is also the first choice for industrial automation system integrators. Supports various mainstream operating systems, including for Windows and for Linux. In addition, the two extended RS-232 serial ports can support communication rates up to 230.4Kbps and provide modem control signals to ensure compatibility with various peripheral serial port devices. Since the card is PCIE x1, it can be installed on various PCIE slots (including 4x 8x16x). Compliant with PCI-Express specification Revision 1.1 PCI-Express Single-Lane (x1) bus bandwidth 2.5Gbps Support DOS, Windows 8 / 7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, Linux and other operating systems Serial port interface (RS232) Compliant with industrial standard 16C450/16C550 UART Built-in 256-byte FIFO and built-in H/W, S/W flow control function Each serial port data transmission rate can reach 250Kbps (customized version data transmission can reach 1Mbps) Baud rate: 230.4Kbps Serial communication parameters Data bits: 5, 6, 7, 8 Stop bits: 1, 2 Parity: None, Even, Odd, Space, Mark Flow control: RTS/CTS, XON/XOFF I/O address: assigned by BIOS IRQ: assigned by BIOS Serial port signal RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND Color: black Material: PCB+Metal Package Contents: 1 x PCIe Card 1 x Driver CD Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.