Startech 4 Port PCIe RS232 Serial Board

  • RS Stock No. 898-8554
  • Mfr. Part No. PEX4S553B
  • Manufacturer Startech
Product overview and Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): CN
Product Details

PEX4S553B PCI Express RS232 Serial Adapter Card

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot.
The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.
The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows®, Linux, and MAC OS.
This product is a replacement for our PEX4S552B card.
Backed by a lifetime warranty and free lifetime technical support.

Features & Benefits

• Native single chip design
• Includes a full profile and low profile/half-height bracket
• On chip 256-byte depth FIFO in transmit/receive path of each port
• Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps
• Supports hardware and software flow control
• Supports data transfer rates up to 250Kbps on each port
• Compliant with PCI Express base specifications revision 1.0a
• Automated out-of-band flow control using CTS/RTS and DSR/DTR
• Lower CPU load of native single-chip, single lane PCI Express design ensures optimal system performance (up to 48% less CPU load)
• Includes both standard and low profile/half-height brackets, which makes this the perfect card for any application, including small form factor embedded applications
• Breakout cable design means that only one expansion slot is needed, to add 4 additional serial ports to any system


• Point-of-Sale (POS credit/debit card readers, receipt printers, bar code scanners, cash registers, scales)
• Manufacturing (CNC machinery, process control equipment, bar code scanners, serial printers)
• Connect specialized parallel and serial devices like printers, scanners, ISDN terminal adapters, CD-R/RWs, Zip® drives and memory card readers
• Environmental Control (lighting, temperature, clocks)
• Entertainment (video lottery terminals, slot machines, gaming systems)
• Healthcare (patient monitoring equipment, nurses' stations, modems)
• Security (UPS control, access key panels, video cameras, card readers, modems)
• Hospitality/Restaurant (serial printers, bar code scanners, keyboard, mouse, receipt printer, credit/debit card reader)
• Consumer (modems, PDAs, digital cameras, printers)
• ISDN Networking

What’s in the package?

• 4 Port PCI-Express Serial Card
• Breakout cable
• Full profile bracket
• Driver CD
• Instruction Manual

PCI ExpressCards RS-232

PCI Express (PCIe) is a serial I/O technology that has been designed to deliver significantly more data than the existing PCI standard, with a transfer rate of 2.5Gb/s in each direction per lane. PCIe is expected to replace PCI on all new personal computers to the end of this year. Initially, personal computers will have both PCI and PCIe slots available. Drivers for all popular operating systems including Windows 7.

Attribute Value
Bus Type PCIe
Communication Interface Serial
Number of Ports 4
Connection Port RS232
Maximum Baud Rate 230.4kbit/s
FIFO Size 256 B
40 In stock for delivery within 6 working days
Price (VAT excluded) Each
TWD 4,049.00
(exc. GST)
TWD 4,251.00
(inc. GST)
Per unit
1 +