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You are here: Home / Reviews / Best Serial Port Cards

Best Serial Port Cards

Serial port card is a device that can be installed in a computer to add serial port functionality. A serial port is a communications port that uses a serial interface to send data to and receive data from a serial device. Some of the renowned brands are Belkin, Addonics, and StarTech.

Choosing the right serial port card is difficult as there are many factors to consider such as the port type, port speed, and port configuration. The most important factor is the port type as there are many different port types such as RS-232, RS-422, and RS-485. To make it easier to find the exact serial port card you’re looking for, we rounded up the best serial port cards on Amazon, according to thousands of customer reviews.

Check out our favorite serial port cards in the list below, and keep reading for our buying guide.

# Preview Product Price
1 XRIKUI Dual Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, PCIE 2X DB9 Card XRIKUI Dual Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11... Buy on Amazon
2 StarTech.com 2-Port PCI Express Serial Card with 16C1050 UART - RS232 Low Profile Serial Card - PCI Serial Card, TAA (PEX2S1050) StarTech.com 2-Port PCI Express Serial Card with 16C1050 UART - RS232 Low Profile Serial Card - PCI... $53.25Amazon Prime Buy on Amazon
3 ELIATER 2-Port PCIe Serial Expansion Card with Industrial DB9 RS232 COM Ports, 16C550 UART WCH382 Chip for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, Low Bracket Included ELIATER 2-Port PCIe Serial Expansion Card with Industrial DB9 RS232 COM Ports, 16C550 UART WCH382... $21.98Amazon Prime Buy on Amazon
4 StarTech.com PCI Serial Parallel Combo Card with Dual Serial RS232 Ports (DB9) & 1x Parallel LPT Port (DB25) - PCI Combo Adapter Card - PCI Expansion Card Controller - PCI to Printer Card (PCI2S1P2) StarTech.com PCI Serial Parallel Combo Card with Dual Serial RS232 Ports (DB9) & 1x Parallel LPT... $28.48Amazon Prime Buy on Amazon
5 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) StarTech.com 1-port PCI Express RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller Card -... $45.82Amazon Prime Buy on Amazon
6 PCIe Combo Serial Parallel Expansion Card PCI Express to Printer LPT Port RS232 Com Port Adapter IEEE 1284 Controller Card WCH382 Chip for Desktop PC Windows 10 with Low Bracket PCIe Combo Serial Parallel Expansion Card PCI Express to Printer LPT Port RS232 Com Port Adapter... $21.98Amazon Prime Buy on Amazon
7 GODSHARK PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC (Will Also Work on PCI-E x4, x8, x16 Slot) GODSHARK PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232... $13.99Amazon Prime Buy on Amazon
8 Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single... $16.99Amazon Prime Buy on Amazon
9 PCI to 2 Serial Port Card, PCIE 2 Port Serial Expansion Card, RS232 RS-232 2 Port Extension Adapter Card, Support 2000/2003 / PCI to 2 Serial Port Card, PCIE 2 Port Serial Expansion Card, RS232 RS-232 2 Port Extension Adapter... $15.00Amazon Prime Buy on Amazon
10 StarTech.com 1-Port PCI Express Serial Card, PCIe to RS232 (DB9) Serial Interface Card, PC Serial Card, 16C1050 UART, Standard/Low Profile Brackets, COM Retention, Windows/Linux, TAA StarTech.com 1-Port PCI Express Serial Card, PCIe to RS232 (DB9) Serial Interface Card, PC Serial... $49.53Amazon Prime Buy on Amazon

Our Editor’s Best Serial Port Cards Reviews

Bestseller No. 1
XRIKUI Dual Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, PCIE 2X DB9 Card
XRIKUI Dual Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, PCIE 2X DB9 Card
  • Dual Serial Ports: Provides two independent RS232 serial ports, enabling connections with multiple serial DB9 port (RS232 communication) devices, significantly expanding your system's connectivity.
  • Wide Compatibility: Requires driver installation for Windows XP, Vista, 7, 8.x, 10, 11 (32/64-bit) systems. For Linux kernels 2.6.x, 3.x, 4.x, 5.x, source code on the driver CD can be compiled.
  • Advanced Chip Solution: Utilizes the ASIX AX99100 solution supporting 256-byte depth FIFO transfer on-chip, suitable for Intel, AMD, and ARM hardware platforms.
  • Versatile Bracket Design: Comes with a full-size bracket for standard PCs and a low-profile bracket for 2U computers. Compatible with PCIe x1 slots and also fits x4, x8, x16 slots.
  • Important Notes:Ensure your computer has an available PCIe slot,for 2U computers, manually replace with the low-profile bracket,for desktop computers, install the correct driver from the Mini-CD.
Buy on Amazon
SaleBestseller No. 2
StarTech.com 2-Port PCI Express Serial Card with 16C1050 UART - RS232 Low Profile Serial Card - PCI Serial Card, TAA (PEX2S1050)
StarTech.com 2-Port PCI Express Serial Card with 16C1050 UART - RS232 Low Profile Serial Card - PCI Serial Card, TAA (PEX2S1050)
  • MEETS INDUSTRY STANDARDS: The 2-port PCI express serial card is compliant with PCI Express 1.0a specification, and it's compatible with 1x, 2x, 4x, 8x and 16x PCI Express slots.
  • MAXIMUM COMPATIBILITY: The dual port DB9 to PCIe adapter is ideal for system upgrades in a wide range of applications including manufacturing equipment, POS equipment, and security devices.
  • HIGH-PERFORMANCE COMMUNICATION: The low-profile serial card delivers high-performance serial communication, with support for data transfer rates of up to 460Kbps.
  • SIMPLE INSTALLATION: The PCI dual serial adapter features IRQ sharing and supports plug-and-play connection. It has a standard-profile bracket installed, and an optional low-profile bracket.
$53.25 Amazon Prime
Buy on Amazon
Bestseller No. 3
ELIATER 2-Port PCIe Serial Expansion Card with Industrial DB9 RS232 COM Ports, 16C550 UART WCH382 Chip for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, Low Bracket Included
ELIATER 2-Port PCIe Serial Expansion Card with Industrial DB9 RS232 COM Ports, 16C550 UART WCH382 Chip for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, Low Bracket Included
  • This card capability allow for upgrade with additional serial cards to your computer easily. Note: Open the "CH38XDRV"file in the CD to install.
  • 2 x 16C550 Fast Uart serial ports, supporting data transfer rates up to 230400Bps.
  • Plug and Play, Automatically selects IRQ & IO address, Supports IRQ sharing.
  • Compliant with ExpressCard/34mm Standard; Compatible to 1-Lane (x1) PCI-Express Throughput.
  • Operating System: Windows 32bit 2000/XP/2003 Server/Vista and 64bit XP/2003 Server/Vista/WIN7/WIN8/WIN10/WIN11/Linux. (If there was any problem with PCIE 2 port serial expansion card, pls feel free to contact us, we will provide a solution within 24hrs.)
$21.98 Amazon Prime
Buy on Amazon
Bestseller No. 4
StarTech.com PCI Serial Parallel Combo Card with Dual Serial RS232 Ports (DB9) & 1x Parallel LPT Port (DB25) - PCI Combo Adapter Card - PCI Expansion Card Controller - PCI to Printer Card (PCI2S1P2)
StarTech.com PCI Serial Parallel Combo Card with Dual Serial RS232 Ports (DB9) & 1x Parallel LPT Port (DB25) - PCI Combo Adapter Card - PCI Expansion Card Controller - PCI to Printer Card (PCI2S1P2)
  • PCI CARD WITH SERIAL & PARALLEL PORTS: Using one PCI bus, add a DB25 parallel & two DB9 RS232 ports to your computer; Serial Parallel PCI Card installs in 2x full profile or 3x low profile expansion slots; Auto IRQ & IO assignment; Supports IRQ Sharing
  • TECH SPECS: Parallel Speeds up to 1.5Mbps | Supports SPP/Byte/ECP/EPP modes | Compatible with IEEE 1284 | Asix MCS9865 chip | RS-232 speeds up to 115.2 Kbps | 16C550 UART | 256 byte FIFO buffer | 5-9 bit character | Even, Odd, No, Space or Mark Parity
  • VERSATILE APPLICATIONS: PCI expansion combo card adds LPT Printer & two COM serial ports working with printers, scanners, plotters, point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, oscilloscope
  • STANDARD PROFILE & LOW PROFILE BRACKETs: PCI multiport Parallel LPT & dual serial COM adapter card installs using 2x standard bracket (pre-installed) or 3x low profile brackets (incl); Supports Windows 7 and up, Linux 2.6.x to 5.x
$28.48 Amazon Prime
Buy on Amazon
SaleBestseller No. 5
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)
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)
  • 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
$45.82 Amazon Prime
Buy on Amazon
Bestseller No. 6
PCIe Combo Serial Parallel Expansion Card PCI Express to Printer LPT Port RS232 Com Port Adapter IEEE 1284 Controller Card WCH382 Chip for Desktop PC Windows 10 with Low Bracket
PCIe Combo Serial Parallel Expansion Card PCI Express to Printer LPT Port RS232 Com Port Adapter IEEE 1284 Controller Card WCH382 Chip for Desktop PC Windows 10 with Low Bracket
  • This card capability allow for upgrade with additional serial or parallel cards to your computer easily. Note: Open the "CH38XDRV"file in the CD to install.
  • Multi-mode IEEE 1284 compliant controller (SPP, PS2, EPP, ECP), Faster data rates up to 1.5Mbps for parallel port.
  • Plug and Play, Automatically selects IRQ & IO address, Supports IRQ sharing.
  • Compliant with ExpressCard/34mm Standard; Compatible to 1-Lane (x1) PCI-Express Throughput.
  • Operating System: Windows 32bit 2000/XP/2003 Server/Vista and 64bit XP/2003 Server/Vista/WIN7/WIN8/WIN10/WIN11/Linux. If there was any problem with PCIe combo serial parallel expansion card, pls feel free to contact us, we will provide a solution within 24hrs.
$21.98 Amazon Prime
Buy on Amazon
Bestseller No. 7
GODSHARK PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC (Will Also Work on PCI-E x4, x8, x16 Slot)
GODSHARK PCIe Serial Expansion Card, 2 Port PCI Express 1.0 x 1 to Industrial DB9 COM RS232 Converter Adapter Controller for Desktop PC (Will Also Work on PCI-E x4, x8, x16 Slot)
  • Two (2) 9-pin RS-232 serial ports.
  • PCI Express x1 interface (will also work on PCI-E x4, x8, x16 slot).
  • Compliant with PCI Express specification Revision 1.1.
  • PCI Express single-lane (x1) bus bandwidth 2.5 Gbps.
  • Support DOS, Windows 98 / Me / NT4.0 / 2000 / XP / Vista / Win7 / Win8 / Server 2003 & 2008 / Linux operating systems.
$13.99 Amazon Prime
Buy on Amazon
SaleBestseller No. 8
Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port
Single Port PCI Express x1 RS232 Serial Adapter Card - PCIe RS232 Serial Host Controller to Single Serial DB9 Port
  • 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
$16.99 Amazon Prime
Buy on Amazon
Bestseller No. 9
PCI to 2 Serial Port Card, PCIE 2 Port Serial Expansion Card, RS232 RS-232 2 Port Extension Adapter Card, Support 2000/2003 /
PCI to 2 Serial Port Card, PCIE 2 Port Serial Expansion Card, RS232 RS-232 2 Port Extension Adapter Card, Support 2000/2003 /
  • Compliant with PCI 2.1 specification, support 32-bit PCI bus. Plug and play, automatic allocation of IRQ and I / O address.
  • One host can support multiple multi-serial card. Data bit: 4, 5, 6, 7, 8 bytes.
  • Parity bit : NONE EVEN OLD SPACE MARK. Stop bit : 1, 1.5, 2.
  • control: None, hardware, Xon / Xoff. Support 2000/2003 / operating system.
  • The maximum data transfer rate is up to 1M / S. RoHS compliant.
$15.00 Amazon Prime
Buy on Amazon
SaleBestseller No. 10
StarTech.com 1-Port PCI Express Serial Card, PCIe to RS232 (DB9) Serial Interface Card, PC Serial Card, 16C1050 UART, Standard/Low Profile Brackets, COM Retention, Windows/Linux, TAA
StarTech.com 1-Port PCI Express Serial Card, PCIe to RS232 (DB9) Serial Interface Card, PC Serial Card, 16C1050 UART, Standard/Low Profile Brackets, COM Retention, Windows/Linux, TAA
  • PCIE TO SERIAL: Connect a serial RS232 (DB9) device to a computer with this PC serial card. Features support for high performance 16C1050 UART. Monitor activity with the built-in LED status lights on the PCI express DB9 card
  • DEVICE COMPATIBILITY: Use this serial interface card to connect with barcode readers/scanners, receipt printers, scales, PLCs, medical devices, etc. The UART PCIe card supplies 5V or 12V power over pin 9. Low-profile bracket is included
  • APPLICATIONS: This card is ideal for IT applications such as server rooms, industrial control/automation, logistics, and laboratories. Continue using legacy hardware with this RS232 PCIe card. DB9 port accepts screw locking serial cables
  • PC SERIAL CARD SPECS: 1 Port | 16C1050 UART | Max Baud 921.6 Kbps | 256 Byte FIFO | COM Retention | Supports Windows and Linux | Asix AX99100 Chipset | Odd/Even/Mark/Space/None Parity Modes | 5/6/7/8/9 Data Bits | PCIe 2.0 x1 | Low-profile Bracket Included
$49.53 Amazon Prime
Buy on Amazon

Best Serial Port Cards Buying Guide

Before choosing the best serial port cards you should consider following options:

1. Protocol: The first thing you should check when looking for a serial port card is the protocol it supports. The most common protocols are:

16-bit ISA cards: These cards are the most widely available and can be used in any PC or laptop that supports ISA slots. You can find them for as cheap as $10.

32-bit PCI cards: These are more expensive than 16-bit cards, but they’re compatible with the latest operating systems.

2. Speed: If you want the maximum throughput, then you should buy a 32-bit PCI card. If you don’t mind compromising a little bit of speed, then you can get a 16-bit card for a cheaper price.

3. Compatibility: If you’re planning to use your serial port card in a Windows environment, then you should buy a card that supports the latest Windows OS.

What else you should know about serial port cards

1. What are the best serial port cards for PCs?

There is no definitive answer to this question since it depends on the specific needs of the user. However, some popular options for serial port cards include the StarTech 2-Port PCI Express Serial Card and the IOGEAR 2-Port USB to Serial DB9 RS232 Adapter Cable.

2. What are the features of a good serial port card?

Some features of a good serial port card are that it is compatible with a wide range of devices, has low latency, and is easy to install.

3. How do I choose the right serial port card for my PC?

There is no one-size-fits-all answer to this question, as the best serial port card for your PC will depend on your specific needs. However, some things to consider when choosing a serial port card include the number of ports you need, the data transfer speed you require, and compatibility with your existing hardware and software.

4. What are the benefits of using a serial port card?

Some benefits of using a serial port card are that it can be used to add more serial ports to a computer, it can be used to connect serial devices to a computer, and it can be used to improve the performance of serial devices.

5. What are the drawbacks of using a serial port card?

Some drawbacks of using a serial port card are that they can be difficult to install, and they may not work with all types of devices. Additionally, serial port cards can be expensive, and they may not offer the same level of performance as a dedicated serial port.

Conclusion

On the market, there are numerous best serial port cards. Hopefully, the list of the top ten best serial port cards will save you time researching and deciding on the best one for you.

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