4 high-speed RS-232 serial ports with data transfer rates up to 921.6 Kbps Includes disconnect dongle cable 256-byte deep FIFO for each transmitter and receiver Automatic out-of-band hardware flow control using Tx/Rx/RTS/CTS/DSR/DTR/DCD/GND Provide RS-232 serial ports with 5V or 12V power output through COM pins 1 or 9 Built-in SATA power socket to obtain efficient DC power from the system Built-in ±15KV ESD protection for all serial signals Supports automatic hardware flow control and automatic software flow control to reduce CPU load Compliant with PCI Express Base Specification Revision 2.0 Native single-chip, single-channel PCI Express Specification: Chip: AX99100 Interface standard: 4 RS232 standard serial ports, DB9 pins Communication rate: Supports up to 920.6KBPS communication rate Slot: Can be used for PCI-E slots of different lengths of X1 X4 X8 X16 Powered serial port: Set the jumper to supply 5V or 12V to the serial port pin 1 or pin 9 Operating system: Windows 11/10/8.1/8/7/VISTA/XP2003-2008 32/64-BIT, Linux