Plug and play, 2*DP9Pin interface, automatically assign IRQ and I/O addresses, and manually change the port number of the newly added serial port card.Comply with PCI-Express 1.0a standard, PCI-Express rate is 2.5Gb/s. Full duplex channel, comply with PCI-E x1, PCI-E x4, PCI-E x8, PCI-E x16 and other PCI-E slots .Compatible with 16c550 UART standard and 256-byte transmit and receive FIFO, high-speed data transmission rate up to 250k/sec, support RS-232 hardware flow control Data bit length: 5, 6, 7, 8Support MODEM modem signal CTS, DSR, Rl, DCD, DTR, RTS, RS232 level conversion, support remote wake-up and power management functions.Dual-channel data transmission, strong compatibility. Support industrial computer, LED control, POS machine guest display, engraving machine, plotter copier, printer and other 9-pin serial port general equipment.Material:PCB board + metalcolour:blackPackage Contents:1 x Expansion CardOnly the above package content, other products are not included.Note: Light shooting 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.