---
product_id: 3800587
title: "Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port"
brand: "syba"
price: "$61"
currency: NZD
in_stock: true
reviews_count: 10
category: "Syba"
url: https://www.desertcart.nz/products/3800587-single-port-pci-express-x1-rs232-serial-adapter-card-pcie
store_origin: NZ
region: New Zealand
---

# 2.5Gbps PCIe x1 throughput Up to 16Mbps serial data rate RS232/RS422/RS485 multi-protocol support Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port

**Brand:** syba
**Price:** $61
**Availability:** ✅ In Stock

## Summary

> 🚀 Upgrade your legacy gear with lightning-fast serial power!

## Quick Answers

- **What is this?** Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port by syba
- **How much does it cost?** $61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/3800587-single-port-pci-express-x1-rs232-serial-adapter-card-pcie)

## Best For

- syba enthusiasts

## Why This Product

- Trusted syba brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Robust Data Handling:** On-chip 256-byte FIFO and up to 16Mbps transfer rates ensure smooth, reliable data flow.
- • **Plug & Play Simplicity:** No driver hassle—works out of the box on Windows and modern Linux distros for instant productivity.
- • **Compact, Space-Saving Design:** Low-profile form factor fits tight spaces, perfect for sleek, professional setups.
- • **Seamless High-Speed Connectivity:** Experience blazing 2.5Gbps PCIe x1 bandwidth for lag-free serial communication.
- • **Universal Serial Protocol Compatibility:** Effortlessly connect RS232, RS422, and RS485 devices with one versatile adapter.

## Overview

The Syba SD-PEX15021 is a low-profile, single-lane PCI Express x1 serial adapter card featuring the MCS9922 chipset. It supports RS232, RS422, and RS485 protocols with data rates up to 16Mbps and a PCIe throughput of 2.5Gbps. Designed for seamless plug-and-play use on Windows and Linux, it offers robust hardware/software flow control and a 256-byte FIFO buffer for reliable, high-speed serial communication in professional and industrial environments.

## Description

MCS9922 is a single lane multifunction PCI express to I/O controller. It supports two serial ports and eight GPIO's. MCS9922 also provides an option for peripheral expansion through proprietary Cascade interface. The generic cascade interface allows interconnecting with similar chips like MCS9900 to expand the peripheral ports.The serial ports are compatible with RS232, RS422 & RS485 standards and supports throughput from 50bps to 16Mbps. All the GPIO pins are programmable and can be used as Input or Output. An I C interface is provided to configure MCS9922 device options through an external EEPROM.

Review: Inexpensive, no-effort, just works - Pros: * Small (full height bracket on half height board) * Inexpensive (equivalent boards can cost four times more) * PCIexpress 1x slot (small, tidy connector compatible with most modern motherboards) * Four-port breakout cable prevents using up another slot on the back (I could have put one in each PCIe slot) * Each DB-9M connector is labeled with a port number 1 through 4 * No drivers or compilation needed on modern Linux operating systems (Fedora 13 in my case) * Works reliably with following devices: Kantronics KPC3+ Packet TNC, LaCrosse 2300 Weather Station, CyberPower PP1100VA UPS * DMA modes present if needed (I haven't evaluated them) Cons: * I can't think of any! Despite some anxiety and reports found on other product review sites that it might not work out of the box, or require modifications to the driver (which I could do, I am a Linux kernel guy), I was pleased to discover it works reliably out of the box with the stock Linux kernel (Fedora 13). I am totally satisfied.
Review: Works perfectly with Windows 7/64 - As you know, relatively few PCs nowadays are equipped with serial ports yet many devices intended to work with those PCs provide only serial interfaces. USB-to-serial converters tend to be iffy, making this an inexpensive and useful little gadget. The octopus connectors are particularly valuable as there would otherwise not be sufficient space to allow four connections. The PCI-E card is quite small and will fit into limited spaces such as those tight areas resulting from installation of a big video card. As another reviewer pointed out, the connectors are numbered 1-4 but this does not mean that when you connect the adapter they are actually going to show up as COM1 through COM4. The presence of any virtual serial ports, for example, may alter the port numbering. The user in this situation may need to stick labels on the connectors identifying their actual port numbers. Installation was a breeze. On Win 7/64, one can just plug in and go. A driver disc is provided but my system found appropriate drivers on its own. Over recent weeks, I have connected multiple devices via the Syba 4x serial port card and each has performed correctly. Highly recommended.

## Features

- MCS9922 Chipset
- Compatible with Industrial Standard 16C550 UART. On Chip 256-byte Depth FIFO in Transmit.
- Transfer data rates up to 250Kbps on each port. Supports hardware and software flow control. Supports 5, 6, 7, 8-bit Serial format
- Fully compliant with PCI-Express base Specification Revision 1. 0a
- Single-lane (x1) PCI-Express with throughput up to 2. 5Gbps
- Form Factor: Low profile

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003BYRO7E |
| Best Sellers Rank | #10 in Serial Port Cards |
| Brand | Syba |
| Customer Reviews | 4.2 4.2 out of 5 stars (165) |
| Date First Available | March 1, 2010 |
| Graphics Card Ram Size | 1 MB |
| Is Discontinued By Manufacturer | No |
| Item Dimensions LxWxH | 7 x 1.5 x 6 inches |
| Item Weight | 4 ounces |
| Item model number | SD-PEX15021 |
| Manufacturer | Syba |
| Operating System | Windows |
| Product Dimensions | 7 x 1.5 x 6 inches |
| Series | SD-PEX15021 |

## Product Details

- **Brand:** Syba
- **Compatible Devices:** Personal Computer
- **Hardware Interface:** PCI Express x1
- **Item Weight:** 4 ounces
- **Style:** 1 Port DB9 Serial PCI-e 1.0 x1 Card

## Images

![Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port - Image 1](https://m.media-amazon.com/images/I/71EBiES1FdL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Inexpensive, no-effort, just works
*by J***S on October 28, 2010*

Pros: * Small (full height bracket on half height board) * Inexpensive (equivalent boards can cost four times more) * PCIexpress 1x slot (small, tidy connector compatible with most modern motherboards) * Four-port breakout cable prevents using up another slot on the back (I could have put one in each PCIe slot) * Each DB-9M connector is labeled with a port number 1 through 4 * No drivers or compilation needed on modern Linux operating systems (Fedora 13 in my case) * Works reliably with following devices: Kantronics KPC3+ Packet TNC, LaCrosse 2300 Weather Station, CyberPower PP1100VA UPS * DMA modes present if needed (I haven't evaluated them) Cons: * I can't think of any! Despite some anxiety and reports found on other product review sites that it might not work out of the box, or require modifications to the driver (which I could do, I am a Linux kernel guy), I was pleased to discover it works reliably out of the box with the stock Linux kernel (Fedora 13). I am totally satisfied.

### ⭐⭐⭐⭐⭐ Works perfectly with Windows 7/64
*by M***N on December 2, 2010*

As you know, relatively few PCs nowadays are equipped with serial ports yet many devices intended to work with those PCs provide only serial interfaces. USB-to-serial converters tend to be iffy, making this an inexpensive and useful little gadget. The octopus connectors are particularly valuable as there would otherwise not be sufficient space to allow four connections. The PCI-E card is quite small and will fit into limited spaces such as those tight areas resulting from installation of a big video card. As another reviewer pointed out, the connectors are numbered 1-4 but this does not mean that when you connect the adapter they are actually going to show up as COM1 through COM4. The presence of any virtual serial ports, for example, may alter the port numbering. The user in this situation may need to stick labels on the connectors identifying their actual port numbers. Installation was a breeze. On Win 7/64, one can just plug in and go. A driver disc is provided but my system found appropriate drivers on its own. Over recent weeks, I have connected multiple devices via the Syba 4x serial port card and each has performed correctly. Highly recommended.

### ⭐⭐⭐⭐ Awesome Product
*by N***T on March 19, 2012*

I've been using usb to serial adapters since serial ports went the way of the dodo bird on motherboards but would occasionally have to unplug the usb adapter and find out the new serial port number. It worked right away with the kernel module was loaded. I had problems with my motherboard after about 3 days, but I think it was because the card was not seated properly. I'll give it a 5 if it's stable for a little longer.

## Frequently Bought Together

- Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port
- SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-21*