4-Port RS-232 PCI Express to Serial PCI Express I/O Card

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The PCIe-400 and PCIe-400LP PCI Express 4-port serial I/O cards are plug and play high-speed serial I/O expansion cards for the PCI Express bus. Connecting to a PCI Express bus on your computer, the PCI Express 4-port serial I/O card instantly adds four RS-232 serial I/O communication ports to your system. The PCI Express 4-port serial I/O cards are designed to utilize the Exar XR17V354 PCI Express to UART chip. The PCIe-400 & PCIe-400LP support high-speed data rate up to 921.6kbps. Each serial port is fully compatible with 16C550 UART, with enhanced feature of 256 bytes TX and RX FIFO buffer for higher performance.

The PCI Express 4-port serial I/O card is an advanced and high efficient solution for serial data communication and industrial automation applications.


  • PCI Express 2.0 Gen 1 compliant
  • PCI Express 1 Lane compliant
  • 16C550 compatibility
  • 256 bytes receive FIFO buffer
  • 256 bytes transmit FIFO buffer
  • Automatic RTS/CTS or DTR/DSR hardware flow control with programmable hysteresis
  • Automatic Xon/Xoff software flow control
  • Drivers provided for Windows and Linux OS
  • Wide ambient temperature operation 0°C to 60°C (32°F to 140°F)
  • CE, FCC approval
  • Supports two high speed RS-232 serial ports with data transfer rate up to 921.6kbps
  • Provides 15KV ESD protection for all serial signals
  • Four DB9 male connectors for serial data communication
  • RS-232 data signals: DCD, RxD, TxD, DTR, GND, DSR, RTS, CTS, RI
  • Includes one adapter cable converting a DB44 female connector to four DB9 male connectors. Cable length: 30cm
  • PCIe-400 with standard profile bracket
  • PCIe-400LP with low profile bracket for slim case


BusPCI Express; Single-Lane (×1)
ChipsetEXAR XR17V354
Plug & PlaySupported
IRQ & IO AddressAssigned by system BIOS
MechanicalPCIe-400 with standard bracket
PCIe-400LP with low profile bracket for slim case
Serial Port
No. of PortsFour
Connectors & CablesOne DB44 male connector on card
One DB44 female to four DB9 male adapter cable included
RS-232 SignalsDCD, RxD, TxD, DTR, GND, DSR, RTS, CTS, RI
Max. Bitrates921.6kbps
Serial ConfigurationData bits: 5, 6, 7, 8
Parity: None, Odd, Even, Mark, Space
Stop bits: 1, 1.5, 2
UART FIFO Buffer SizeEach port with 256 bytes FIFO for transmit & receive
Operating Temperature0°C to 60°C
Storage Temperature-40°C to 85°C
Humidity0 to 80% RH. Noncondensing
Safety ApprovalsCE, FCC



Product Manual


PCI Express I/O Cards Driver

For all the newer linux kernels the support for PCIe is already,But if you intend to use the Enhanced features of the device(i.e. Auto RTS/CTS, Auto RS485 etc) or enable disable MPIO, in that case you will need the custom driver.