Product Details ：Chip: For Moschip Mcs9900 Pci E Interface: Pci Express X1 Interface, Which Can Be Used For Different Length Pci-e Slots Of X1 X4 X8 X16 Interface Standard: 2 Rs232 Standard Serial Ports, Db9 Pin Transmission Rate: 250 Kbps Per Serial Port Baud Rate: 50bps To 250kbps Slot Specification: Comply With Pci Express Revision 1.1 : For Windows10 / 8 / 7 / Xp / 200 / 2003-2008 32 / 64bit, Linux , , Etc Compliant With Industry Standard 16c450/16c550 Uart Built-in 256-byte And Built-in H/w, S/w Flow Control Function On The Chip The Data Transmission Rate Of Each Serial Port Can Reach 250kbps Baud Rate: 50 Bps To 250 Kbps Serial Communication Parameters Data Bits: 5, 6, 7, 8 Stop Bits: 1, 1.5, 2 Parity: None, Even, Odd, Space, Mark Flow Control: /, Xon/xoff I/o Address: Assigned By Bios : Assigned By Bios Serial Signal -232: Txd, Rxd, , , Dtr, , Dcd, Gnd Colour: Black Material: Pcb Size: 12cm Package Contents: 1 X Adapter Only The Above Package Content, Other Products Are Not Included. Note: Light And Different