StarTech
.com 1 Port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 - 16950 UART - Low Profile Expansion Card - Windows & Linux , TAA (PEX1S953LP)
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
This RS232 Serial Adapter Card lets you add an RS232 (DB9) serial port to your computer through a PCI Express (PCIe) slot. It enables your system to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.4Kbps. Maximum Compatibility With broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments. The card comes pre-configured with a low-profile bracket, and includes an optional full-profile bracket, so installation is easy regardless of the case form factor. Experience Optimal…
SpecPicks Verdict
SpecPicks classifies StarTech.com 1 Port PCI Express RS232 Serial Adapter Card - PCIe… as a mid-pack option worth checking against alternatives in the expansion cards category, based on 13 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. StarTech's positioning sits within the broader category mid-tier. 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
- ✓ Backed by StarTech's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Below-average customer rating — read recent reviews before buying
- ✗ 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
- 1 PORT SERIAL CARD: Serial controller card w/ 16950 UART based on ASIX AX99100, allows 1x DB9 port w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit; Upgraded version of our popular card PEX1S952LP
- OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total
- STANDARD PROFILE & LOW PROFILE BRACKET: PCIe serial card comes w/ a low profile bracket pre-installed & 1x full profile bracket is incl for versatile install; Supports Windows & Linux
- VERSATILE APPLICATIONS: For low/standard profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | 1 Port |
| Style Name | 1 Port |
| Unit Count | 1.0 Count |
| Model Number | PEX1S953LP |
| Compatibility | Linux |
| Item Type Name | Serial Adapter |
| Mfr Part Number | PEX1S953LP |
| Operating System | Linux,Windows |
| Compatible Devices | [Devices with PCI Express slot and compatible operating system] |
| Hardware Interface | PCI |
| Warranty Description | Lifetime |
| Item Dimensions L x W x H | 3.9"L x 2.6"W x 5.9"H |
| OPTIONAL CONFIGURABLE POWER | PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total |
Ready to buy?
StarTech.com 1 Port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card - PCIe to Serial DB9 - 16950 UART - Low Profile Expansion Card - Windows & Linux , TAA (PEX1S953LP) 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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