Best Serial Port Cards 2026

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Last Updated - 22.07.2026

Best Choice

01

StarTech

StarTech.com 4-Port Serial PCIe Card, Quad-Port PCI Express to RS232/RS422/RS485 DB9 Serial Card, Standard/Low Profile Brackets, 16C1050 UART, ESD Protection, Windows/Linux (PS74ADF-SERIAL-CARD)

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9.6

Exceptional

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Specifications: Asix AX99100 chipset; 16C450 & 16C550 UART compatible; 4x 9-pin D-Sub ports; Max Baud 921.6Kbps per port; 256 byte FIFO; COM retention; Windows and Linux compatible; Odd/Even/Mark/Space/None Pare. 5. /6/7/8/9 data bits; PCIe 2.0 x1
STANDARD AND LOW PROFILE MOUNTINGS: The TAA compliant serial card is equipped with two standard profile mounts (pre-installed) and includes four low profile brackets for compatibility with small form factor desktops/servers
Areas of use: ideal for desktops and servers with a variety of applications, e.g. POS terminals, PLC, factory control and automation, scientific sensors, medical devices, scanners and oscilloscopes; DB9 connectors with screw fuse
Adjustable power supply: the quad-port PCI Express serial adapter card has adjustable power supply of 12V (1.5A per port), 5V (1.5A per port) or 0V (RI) via pin 9 via SATA; the power supply is adjustable for each port individually via jumper
4-Port PCIE SERIAL CARD: With DIP switches, each DB9 serial port can be operated in independent mode, which allows connection of RS-232, RS-422 and RS-485 devices; LED indicators to monitor the transmitting/receiving status of the data

182,06 €
Value for Money

02

StarTech

StarTech. com 2-Port Serial PCIe Card, Quad-Port PCI Express to RS232/RS422/RS485 DB9 Serial Card, Standard/Low Profile Brackets, 16C1050 UART, ESD Protection, Windows/Linux (2S232422485-PC-CARD)

19% Off

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9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Specifications: Asix AX99100 chipset; 16C450 & 16C550 UART compatible; 2x 9-pin D-Sub ports; Max Baud 921.6Kbps per port; 256 byte FIFO; COM retention; Windows and Linux compatible; Odd/Even/Mark/Space/None Pare. 5. /6/7/8/9 data bits; PCIe 2.0 x1
STANDARD AND LOW PROFILE MOUNTINGS The TAA compliant serial card is equipped with a standard profile bracket (pre-installed) and includes two low profile brackets for compatibility with small form factor desktops/servers
Areas of use: ideal for desktops and servers with a variety of applications, e.g. POS terminals, PLC, factory control and automation, scientific sensors, medical devices, scanners and oscilloscopes; DB9 connectors with screw fuse
Adjustable power supply: the dual-port PCI Express serial adapter card has adjustable power supply of 12V (1.5A per port), 5V (1.5A per port) or 0V (RI) via pin 9 via SATA; the power supply is adjustable for each port individually via jumper
2-PORT PCIE SERIAL CARD: DIP switches allow independent operation of each DB9 serial port and thus connect RS-232, RS-422 and RS-485 devices; LED indicators indicate the status of data transmission and reception

87,88 € 108,54 €(19% Off off)
03

Sxhlseller

2 Port PCI Express RS232 DB9 Serial Port Card for XP, Vista, 7, 8.x, 10, 11 32/64bit for Linux, Serial PCIe Expansion Card, PCIe Serial Host Controller Card

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9.3

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

SUPPORTS 256 BYTE DEPTH: The PCIe serial expansion card selects the ASIX AX99100 program, which supports on-chip FIFO transmissions with a depth of 256 bytes. Suitable for , for ARM hardware platforms.
SUPPORTIVE OS: Requires driver installation for XP, for Vista, 7, 8.x, 10, 11 (32/64 bit) systems. The Linux kernel 2.6.x, 3.x, 4.x, 5.x requires a reference to the compiled source code.
PCIE X1 INTERFACE: The full-size bracket of this expansion card is suitable for standard sized PCs, based on the PCIE
APPLICATIONS: The DB9 serial PCIE card seamlessly connects POS systems, industrial meters and control devices, security systems, logistics management equipment, scanners, printers and other DB9 serial connection devices.
2 SERIAL PORTS With PCIE RS232, users can add two RS232-BD9 serial ports to desktop computers or industrial devices via the PCI Express slot on the motherboard.

14,35 €
04

Zunate

LSI SAS 9300 16I HBA Card 12Gbps 16 SATA SAS Port HBA Controller Card PCIe 3.0 PCIe 8X for Linux VMware Freebsd

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9.1

Excellent

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Main highlights

High Speed Transmission The HBA card supports a powerful SAS data transfer rate of 12Gbps for fast signaling and high bandwidth applications. With PCIe slot type, PCIe 3.0, PCIe 8X bus type.
External device connectivity: The 9300 16I HBA card features a flexible storage architecture that supports connectivity to a large number of SAS or SATA end devices in an external enclosure.
Compatible systems: The HBA expansion card is compatible with a variety of operating systems, including for Linux (for SUSE, for Red Hat), for VMware, for FreeBSD, etc.
Applications The LSI SAS 9300 16I controller HBA card provides powerful internal storage connectivity for servers. High quality PCB material ensures high reliability and stability.
16 Ports The HBA controller card has 16 built-in 12Gbps SAS and SATA ports to connect up to 1024 non-RAID SAS and SATA devices, which is plug and play capable and easy to install and use.

85,05 €
05

Hoite

Hoite RS232 PCI Express Serial Interface Card PCI-E to Dual RS-232 Serial Port + 1 DB25 Parallel LPT Connector Adapter for Low Mount Desktop PC

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8.9

Very Good

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Main highlights

Two (2) 9-pin RS-232 DB9 serial ports and one parallel LPT port for the DB 25 are available.
The 2-port serial card can be installed in a free PCIE slot to add two RS232 serial ports to your system.
Supports DOS, Windows 8/7 / Vista / XP / 2000 / Server 2003-2008 32/64-bit, Linux.
Allows you to easily connect multiple serial and parallel devices to your computer.
A cost-effective solution for connecting a new or legacy serial device with data transfer rates of up to 230.4 Kbps.

12,99 €
06

Create idea

Create idea Port Card PCI Express Serial Card PCI Express Serial Extension Adapter PCI-E to RS232 Serial Expansion Card Compatible with Windows XP/Vista/7/8

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Wide application: perfect for use in ticket printing, barcode scanning, card reading, cash register systems and various other applications.
Improved data transfer: Built-in 256-byte FIFO and hardware/software flow control ensure reliable data transfer at speeds of up to 250 Kbps per port.
EASY INSTALLATION - Easy Setup - Simply insert the PCI Express control card into your computer's free slot and install the included drivers.
Dual RS232 ports: Turn a single PCI Express slot into two RS232 (DB9) serial ports and double your connectivity options.
Compliance and support: complies with PCI-Express Specification Revision 1.1. Support DOS, compatible with Windows 8/7/Vista/XP/2000/Server 2003-2008, 32/64-bit, compatible with Linux and other operating systems.

21,90 €
07

OTOTEC

OTOTEC SD2SP2 Pro Speicherkartenleser Micro-SD-Kartenleser Speicherkartenadapter Unterstützt TFCard Kompatibel mit Gamecube (DOL-001)

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8.7

Very Good

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Main highlights

SD memory card adapter with serial port for running Homebrew on GameCube consoles.
Please make sure your GameCube has a serial port at the bottom before purchasing.
Only compatible with NGC GameCube (DOL-001).
Mounts under the console behind the cover that reads "Serial Port 2".
Download Gamecube games from an SD/Micro SD card. Load other homebrews (gameboy interface, GC memory manager, emulator, etc.).

11,39 €
08

Cosentoll

Cosentoll PCIe 5.0 Dual MCIO 8i to PCIex16 Slot Adapter Expansion Card with 6-Pin GPU Power Port for Servers and Workstations

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8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

User-friendly design: this expansion card features a plug and play design without requiring additional drivers. The installation process is simple and quick, enabling users to enjoy a convenient usage experience effortlessly
Strong device communication capability: equipped with a PCIex16 armored slot, this expansion card can connect high performance graphics cards, professional network cards, etc. A 6pin power connector ensures sufficient power supply for various devices, meeting diverse and complex usage scenarios
Robust and durable design: built with high quality, low loss PCB material, this expansion card boasts excellent durability and stability. It effectively resists electromagnetic interference, ensuring stable data transfer during extended periods of high - intensity operation and providing reliable protection for your hardware system
High-speed data transfer: thanks to supporting the PCIe 5.0 standard, this expansion card delivers an impressive single lane speed of 32GT/s and an overall bandwidth of up to 512Gbps. It enables ultra - fast large - scale data transfers, significantly boosting work efficiency and catering to users' high - speed demands
Easy interface conversion: the PCIe expansion card easily converts two MCIO interfaces into a PCIe x16 box and solves the problem of incompatible interfaces. This makes the computer hardware configuration more flexible

53,99 €
09

SIENOC

Sienoc PCI Express PCI-E Dual RS-232 Serial Port PCI-E 2 port serial controller DSUB9 DB9 RS232 COM Card Adapter PCI-E PCI Express Card Adapter Converter

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8.3

Good

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If you install the driver from CD, please select "CH38X" folder with the same cards' chipset.

17,00 €
10

Sxhlseller

Sxhlseller PCIe to Serial ATA Card Efficient 6Gbps PCI Express Expansion Card for NAS Desktop Server for 11 Realtek RTL9101

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8.2

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

[FAST DATA TRANSFER] Enjoy fast data transfer with the Serial ATA3.0 transfer rate of 6Gbps on this expansion card.
[9 SERIAL ATA PORTS] Convert 2 SFF8087 ports into 8 Serial ATA ports and 1 dedicated Serial ATA port for a total of 9 ports to meet all your expansion needs.
Wide system compatibility: compatible with 11, 2003 and systems and ensures seamless integration with a variety of systems.
Low power chip: The PCIe to serial ATA card features a Realtek RTL9101 chip with low power consumption for stable high-speed data transmission, ideal for NAS and servers.
Easy installation: simply plug the card into a PCI E 4X slot, with compatibility for 8X and 16X slots, only supports Serial ATA drives.

35,72 €