StarTech
.com 4 Port PCI Express PCIe Serial Combo Card with Breakout Cable - 2 x RS232 2 x RS422 / RS485 - Dual Profile , TAA (PEX4S232485)
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
The PEX4S232485 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 lets you add two RS232, and two RS422/485 serial ports to your PC through a PCI-Express expansion slot. This PCI express serial card is a single card solution that is compatible with nearly any serial communication protocol, supporting RS-232, RS-422, RS-485 2-wire or RS-485 4-wire operating modes. A flexible solution for adding serial ports to full-sized, or small form factor systems, the 4-port serial card includes both low and full profile brackets while the included breakout cable helps to avoid…
SpecPicks Verdict
SpecPicks classifies StarTech.com 4 Port PCI Express PCIe Serial Combo Card with Breakout… as a niche pick — read recent reviews before buying in the expansion cards category, based on 14 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
- ✓ 4 Port PCI Express PCIe Serial Combo Card
- ✓ 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
- Add two RS232 and two RS422/485 serial ports to your PC through a PCI-Express expansion slot
- 4 Port PCI Express PCIe Serial Combo Card
- 4 port (2 x RS232, 2 x RS422/485) serial combo card
- PCI Express RS485 / PCIe RS485 / PCI Express RS422 / PCIe RS422 serial combo card
- Dual Profile PCIe serial card adapter with breakout cable
- This single PCI Express combo card is compatible with any serial device protocol (RS232, RS422, and RS485), allowing for communication with multiple devices over mixed protocols
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | Classic |
| Style Name | Classic |
| Unit Count | 1.0 Count |
| Model Number | PEX4S232485 |
| Compatibility | PC |
| Built-In Media | Low-profile bracket, Serial adapter |
| Item Type Name | Multiport Serial Adapter |
| Mfr Part Number | PEX4S232485 |
| Operating System | Windows |
| Compatible Devices | Personal Computer |
| Hardware Interface | PCI |
| Warranty Description | Lifetime |
| Item Dimensions L x W x H | 5.3"L x 0.6"W x 2.7"H |
Ready to buy?
StarTech.com 4 Port PCI Express PCIe Serial Combo Card with Breakout Cable - 2 x RS232 2 x RS422 / RS485 - Dual Profile , TAA (PEX4S232485) 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.
Related Expansion Cards
