The AXAGON PCEA-S4 PCI-Express card extends your desktop PC by four RS-232 standard serial ports with DB-9 connectors. 
Seamless compatibility and wide porting options are ensured by using the proven MOSChip chipset. 
Input:
• PCI-Express 1.1 interface compatible with PCI-Express 1.0a / 2.0 / 2.1 / 3.0.
• Number of 1-Lane (x1) lines compatible with x1 / x4 / x8 / x16 PCIe slots.
• The bandwidth of 1-Lane PCI-Express 1.1 bus 2.5 Gb/s.
Output:
• 4x serial RS-232 port with DB9 male connectors, two ports are placed directly on the card’s bracket and the other pair of ports is placed on a separate bracket.
• Maximum transmission rate of used RS232 drivers up to 250 kBd.
• Compatible with 16C550 / Extended 16C550 / 16C950 UART.
Other features:
• Plug and Play Support - automatic selection of IRQ and I/O address.
• Re-Map IO Address Support - COM port address setting (this feature is supported only in DOS).
• 256-Byte transmit & receive FIFO buffer for each port.
• Adjustable flow control Xon/Xoff, hardware or none.
• Adjustable word length 4, 5, 6, 7 or 8 bits.
• Adjustable parity (even, odd, none, mark, space), 1, 1.5 or 2 stop bits.
• Supports TXD, RXD, RTS, CTS, DTR, DCD, DSR, and RI serial signals.
• 9-bit data transmission support.
• Supports connecting serial devices such as ATMs, cash registers, barcode readers, CNC machines, tablets, POSs or PDAs.
• ASIX (formerly MOSChip) MCS9904CV-AA chipset is used.
Supported operating systems:
• MS DOS 6.22, MS Windows 2000 / XP / Vista / 7 / 8 / 8.1 / 10 and later, Windows Server 2003 / 2008 / 2012 / 2016 and later (supported are all 32- and 64-bit Windows OS versions), Linux with kernel 2.6.11 and above.
Package contains:
• PCI-Express card with two serial ports,
• a bracket with a second pair of serial ports,
• CD with drivers,
• printed installation guide in English, Czech, Slovak and Polish,
• packed in a cardboard box.