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PCIe x1 MCS9904 4-port DB9 RS232 Serial Adapter Card with 16C550 UART

  • Product Code: PX1-4S-9904
  • Availability: In Stock
  • Ships: Typically within 3 Business Days
  • Guarantee: 30-day Return and Money Back


The PX1-4S-9904 4-Port Native PCI Express RS232 Serial Adapter Card with 16C550 UART lets you add 4 RS232 (DB9) serial ports, using a single PCI Express expansion slot. 

Based on a native single-chip design, this 4-port serial adapter card allows you to harness the full capability offered by PCI Express (PCIe), while reducing the load applied to the CPU by as much as 48% over conventional bridge-chip serial cards. 

The RS232 Serial Adapter Card includes 2 half-height/low-profile brackets, allowing the card to be installed into almost any PC case, regardless of form factor.


  • Fully compliant with PCI-Express Base Specification Revision.1.1
  • Single-Lan(x1) PCI-Express with throughput up to 2.5Gbps
  • Multiple cards in one PC possible
  • Compatible with industry standard 16C450/16C550 UART
  • Send/receive FIFO buffers , 256bytes for each port
  • Data transfer rates up to 115Kbps on each port
  • Supported hardware and software flow control
  • Supports 5. 6. 7 and 8-bit Serial format
  • Supports even, odd. None . mark and space parity
  • 1 or 2 stop bit operation


  • Chipset: ASIX MCS9904
  • Bus Interface: PCI Exrpess x1, Rev 1.1 (2.5 GT/s)
  • Connectors: 4 x DB9 Serial port
  • FIFO: 256-bytes
  • Data rate: up to 115Kbps
  • Function
    • Support RS-232 Hardware Flow Control
    • Built-in 16C450/16C550 UART
    • Automatically selects IRQ and I/O address
  • System
    • Windows 98se/ ME / NT 4. 0 / Server 2000 / XP / Vista / Server 2003 / Win 7 / Win 8 / Win 10,
    • DOS, Linux, Mac OS

Package Contents

  • 1 x PCIe x1 MCS9904 4-port DB9 RS232 Serial Adapter Card with 16C550 UART
  • 1 x Instruction Manual
  • 1 x Driver CD
  • 2 x Low Profile Bracket

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