StarTech
.com 2 Port PCI RS422/485 Serial Adapter Card with 161050 UART - Serial Adapter - PCI-X - RS-422/485 x 2, TAA (PCI2S4851050)
*Price sourced from Amazon.com. Last updated 2026-05-23. Price and availability subject to change.
The PCI2S4851050 2-Port PCI Serial Adapter Card (RS422/RS485) with 161050 UART adds two DB9 RS422/RS485 serial ports, using a single PCI expansion slot. The PCI serial card offers a high performance 16C1050 UART and supports both 2-wire and 4-wire RS485 modes. The card delivers an efficient single-chip design and a large 256-byte transit/receive FIFO buffer that work together to provide high-speed serial communication while reducing the overall load on the system CPU. With the included standard and low profile/half-height brackets, this PCI serial expansion card suits a broad range of system…
SpecPicks Verdict
SpecPicks classifies StarTech.com 2 Port PCI RS422/485 Serial Adapter Card with 161050… as a niche pick — read recent reviews before buying in the expansion cards category, based on 12 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
- ✓ Supports maximum data transmission rate of 128Kbps
- ✓ 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
- Supports maximum data transmission rate of 128Kbps
- 16C1050 UART with 256-byte Deep FIFO
- Supports 2-wire and 4-wire RS485 modes
- Jumper pins for RS422/485 toggling
- Supports Hardware and Software flow control
Full Specifications
| Brand | StarTech.com |
|---|---|
| Style | Classic |
| Style Name | Classic |
| Unit Count | 1.0 Count |
| Model Number | PCI2S4851050 |
| Mfr Part Number | PCI2S4851050 |
| Operating System | Windows XP, Vista, 7, 8, 8.1, 10, 11, Windows Server 2000, 2003, 2008 R2, 2012, 2016, 2019, 2022 |
| Compatible Devices | Printer |
| Hardware Interface | PCI |
| Warranty Description | Lifetime warranty |
| Item Dimensions L x W x H | 4.7"L x 4.7"W x 1.8"H |
| Global Trade Identification Number | 00065030842587 |
Ready to buy?
StarTech.com 2 Port PCI RS422/485 Serial Adapter Card with 161050 UART - Serial Adapter - PCI-X - RS-422/485 x 2, TAA (PCI2S4851050) 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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