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 Operating system: for windows10 / 8 / 7 / XP / 200 / 2003-2008 32 / 64bit, Linux & Mac, Doc, etc Compliant with industry standard 16C450/16C550 UART Built-in 256-byte FIFO 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: RTS/CTS, XON/XOFF I/O address: assigned by BIOS IRQ: Assigned by BIOS Serial signal RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND colour: black Material: PCB Size: 12cm Package Contents: 5 x Adapter Only 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.