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StarTech.com PEX4S553B 4 Port RS232 PCI Express Serial Card w/ Breakout Cable

Order Code:

19-9786

Brand: StarTech.com MPN: PEX4S553B EAN-13: 0065030842556
Qty Unit Price (Ex VAT)
1+ £104.25
Price per unit {{ this._page.IncVat ? 'Inc' : 'Ex' }} VAT
Available to back orderBack-order availability date - 08/04/2026

The Startech.com PEX4S553B 4-Port PCI Express Serial Card lets you add 4x RS-232 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 adaptor 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.

Backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • Bus type: PCI express
  • Card type: Low profile (SP bracket included)
  • Connector type(s): PCI express x1 male
  • External ports: DB-9 (9 pin, D-Sub) male
  • Interface: Serial
  • Max baud rate: 230.4 kbps
  • OS compatibility: Windows® 10, 8 / 8.1, 7, Vista, XP, XP embedded, POS ready 2009, embedded system 2009
  • Ports: DB-9 (9 pin, D-Sub) male, 4
  • Product dimensions: 80.5 x 68.5 x 12mm
  • Manufacturer's part no.: PEX4S553B
Type PCIe to RS-232 adaptor
Baud rate 230.4 Kbit/s
Cables included Serial
Certification REACH, CE
Chipset ASIX Moschip MCS9904CV-AA
Compliance certificates RoHS
Data bits 5, 6, 7, 8
Depth 80.5mm
Drivers included Yes
FIFO (First In, First Out) 256 B
Harmonized System (HS) code 84733020
Height 68mm
Host interface PCIe
Interface Serial RS-232 x 4
Internal Yes
Linux operating systems supported Yes
Manual Yes
Mounting brackets included Yes
Operating relative humidity (H-H) 5 - 85%
Operating temperature (T-T) 0 - 70 °C
Other operating systems supported DOS, Windows Embedded POSReady 2009, Windows Embedded Standard 2009, Windows XP Embedded
Output interface Serial
Package depth 145mm
Package height 41mm
Package weight 343 g
Package width 208mm
Parity bit Even, Mark, No, Odd
Product colour Black
Serial interface type RS-232
Serial ports quantity 4
Storage temperature (T-T) -40 - 85 °C
Weight 239 g
Width 12mm

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