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StarTech.com PEX2S553 2 Port Dual Profile PCI-E RS-232 Serial Card

Order Code:

19-9776

Brand: StarTech.com MPN: PEX2S553 EAN-13: 0065030841740
Qty Unit Price (Ex VAT)
1+ £41.96
Price per unit {{ this._page.IncVat ? 'Inc' : 'Ex' }} VAT
Available to back orderBack-order availability date - 07/04/2026

The StarTech.com PEX2S553 PCI Express serial card lets you turn a PCI Express slot into 2 x RS-232 (DB9) serial ports. Based on a native single chip design (no bridge chip), this 2-port serial adaptor card allows you to harness the full capability offered by PCI Express (PCIe), and reduces the load applied to the CPU by as much as 48% over conventional serial cards. The RS-232 adaptor card is compatible with a broad range of operating systems including Windows, Linux Kernel 2.6.11 and up, and MAC OS 10.4 and above.

Plus, the serial card includes a pair of optional half-height/low profile brackets that allow the card to be installed in any PCI Express slot, regardless of the size of the computer case.

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


  • Bus type: PCI express
  • Card type: Standard profile (2 x LP brackets included)
  • Connector type: PCI express x1 male
  • External ports: DB-9 (9 pin, D-Sub) male
  • Internal ports: LP4 (4 pin, Molex large drive power) male
  • Max baud rate: 460.8 kbps
  • OS compatibility: Windows, Mac OS and Linux
  • Product dimensions: 120 x 105 x 20mm
  • Manufacturer's part no.: PEX2S553

This product is a replacement for the PEX2S552 card.
Type PCIe to RS-232 adaptor
Baud rate 460.8 Kbit/s
Chipset ASIX - MCS9922CV-AA
Compliance certificates CE, RoHS
Depth 105mm
Drivers included Yes
Expansion card standard PCIe 1.0
FIFO (First In, First Out) 128 B
Harmonized System (HS) code 84733020
Height 20mm
Host interface PCIe
Interface Serial RS-232 x 2
Internal Yes
Linux operating systems supported Yes
Manual Yes
Master (outer) case height 310mm
Master (outer) case length 690mm
Master (outer) case width 355mm
Operating relative humidity (H-H) 5 - 85%
Operating temperature (T-T) -10 - 80 °C
Other operating systems supported DOS, Windows Embedded POSReady 2009, Windows Embedded Standard 2009, Windows XP Embedded
Output interface Serial
Package depth 175mm
Package height 32mm
Package weight 151 g
Package width 145mm
Peripheral (Molex) power connectors (4-pin) 1
Product colour Green
Products per master (outer) case 75 pc(s)
Serial interface type RS-232
Serial ports quantity 2
Storage temperature (T-T) -20 - 100 °C
Sustainability compliance Yes
Weight 61 g
Width 120mm

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