StarTech.com
PCI Express Serial Card - 16 DB9 RS232 Ports - Low + Full Profile - Multiport Serial Adapter - PCIe Serial Card , TAA (PEX16S550LP)
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
This PCI Express serial card adds 16 high-speed RS232 ports to your standard or low-profile desktop or server PC. This lets you maximize the number of available DB9 RS232 ports that are available for connecting your serial-based devices and equipment, while using only a single PCI Express (PCIe) slot. It's the perfect solution for adding the serial ports you need, even if your desktop PC or server only has a limited number of PCIe expansion slots. Add 16 RS232 ports through one PCIe slot You can install the serial card to add 16 high-performance DB9 RS232 serial ports from a single PCIe…
SpecPicks Verdict
SpecPicks classifies StarTech.com PCI Express Serial Card - 16 DB9 RS232 Ports - Low +… as a category leader on buyer feedback in the expansion cards category, based on 4 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. StarTech.com's positioning sits comfortably above the category median. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Highly rated — 4.7★ average across customer reviews
- ✓ Compliant with PCI Express 1.0a/1.1 and compatible with 1x/2x/4x/ 8x/16x PCIe bus
- ✓ Backed by StarTech.com's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Limited review volume so far — fewer data points on long-term reliability
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Key Features
- Add 16 RS232 serial ports (DB9) to your low or full-profile computer through a PCI Express slot
- This 16-Port PCI Express Serial Card provides high-speed PCIe serial card with 16 DB9 RS232 ports from a single PCIe slot
- Multiport serial adapter card enables high-speed serial communication with data transfer rate up to 921.6 Kbps
- Compliant with PCI Express 1.0a/1.1 and compatible with 1x/2x/4x/ 8x/16x PCIe bus
- PCIe serial card / Multiport serial adapter card / Serial PCIe card / Serial expansion card / 16 port serial card / pci serial port / pcie serial card / PCI serial card / pci e serial card / pci express serial card
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | 16 Port |
| Style Name | 16 Port |
| Unit Count | 1.0 Count |
| Model Number | PEX16S550LP |
| Built-In Media | breakout cables (2), driver CD (1), low-profile bracket (1), quick-start guide (1), serial card (1) |
| Item Type Name | PCI Express Serial Card - 16 Port Low-Profile Serial Card - High-Speed PCIe Serial Adapter - Serial Controller DB9 RS232 |
| Mfr Part Number | PEX16S550LP |
| Operating System | Linux |
| Compatible Devices | Personal Computer |
| Hardware Interface | PCI |
| Warranty Description | 2-Year |
| Item Dimensions L x W x H | 6.6"L x 2.7"W x 0.9"H |
| Global Trade Identification Number | 00065030868228 |
Ready to buy?
StarTech.com PCI Express Serial Card - 16 DB9 RS232 Ports - Low + Full Profile - Multiport Serial Adapter - PCIe Serial Card , TAA (PEX16S550LP) is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
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