Best Serial Port Cards Deals of Nov 2026

Updated November 10, 2026Our site contains affiliate links for which we may be compensated.
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PCIE-SE2 2-Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, PCIE RS232 Card, PCIE Serial DB9 Port Card

1. PCIE-SE2 allow users add 2X RS232 BD9 serial Ports on desktop PCs or industrial devices by motherboard PCI Express slot.
2. Seamless connect to serial DB9 ports device such as POS system, industrial testing and control device, security system, logistic management equipment, scanners and printers.
3. Need to install driver on Windows XP, Vista, 7, 8.x, 10, 11 (32/64bit) systems. Linux kernel 2.6.x, 3.x, 4.x, 5.x need to refer compile source code from the driver CD.
4. Selected by ASIX AX99100 solution supports on chip 256-byte depth FIFO in transmit. Works on Intel, AMD, ARM hardware platform.
5. The full-size bracket on this expansion card will works on standard size PCs. The 2X low profile bracket for slim PCs. Based on PCIE X1 interface, will works on X1, X4, X8, X16 slot.
6. ATTENTION: 1. Must make sure users PCs have empty PCIE slot.2. Slim PC users need change to low profile bracket by hand. 3.Please install correct driver from Mini-CD for desktop PCs.
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StarTech 1-Port PCI Express RS232 Serial Adapter Card, TAA (PEX1S953LP) | PCIe RS232 Serial DB9 Host Controller Card, 16950 UART, Low Profile Expansion Card for Windows and Linux

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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.
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StarTech 2-Port PCI Express Serial Card, TAA Windows Compatible (PEX2S1050) | RS232 Low Profile Serial Card, With 16C1050 UART

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StarTech 2-Port PCI Express RS232 Serial Adapter Card, TAA (PEX2S953LP) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9, 16950 UART, Windows & Linux, Low Profile Expansion Card

2 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 2x DB9 ports 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 PEX2S952LP
OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 2 ports are individually configurable
STANDARD PROFILE & LOW PROFILE BRACKET: PCIe multiport serial card comes w/ low profile bracket preinstalled & a full profile bracket is incl for versatile install; supports Windows XP and up & Linux
VERSATILE APPLICATIONS: For standard/low profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope
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BZIZU 2-Port PCIe RS-232 DB9 Serial Port Card - Windows XP/7/8/10/11 & Linux Compatible (32/64bit) for Fast Data Transfer (PCIe1X to Serial to Parallel Port)

Expansion Interface: Easily add 2 RS232 DB9 serial ports to desktop PCs or industrial devices via the motherboard's PCI Express slot, meeting a variety of device connection needs
Wide Compatibility: Seamlessly connect to DB9 serial devices such as POS systems, industrial testing and control equipment, security systems, logistics management devices, scanners, and printers, suitable for various application scenarios
Multi-Platform Support: Driver compatible with Windows XP, Vista, 7, 8.x, 10, 11 (32/64-bit) and Linux kernels 2.6.x, 3.x, 4.x, 5.x, ensuring smooth installation and use across different systems
Efficient Data Transmission: Utilizes the ASIX AX99100 solution, supporting 256-byte deep FIFO transmission, compatible with Intel, AMD, and ARM hardware platforms, providing stable serial data transmission performance
Flexible Installation: Comes with a standard full-size bracket for standard PCs, and includes 2 low-profile brackets for perfect compatibility with slim PCs. Based on the PCIe X1 interface, compatible with X1, X4, X8, and X16 slots
Important: Ensure your PC has an available PCIe slot, switch to the low-profile bracket for slim PCs, and install the correct driver from the Mini-CD for desktop use
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StarTech 2-Port Serial PCIe Card, 16C1050 UART, TAA (2S232422485-PC-CARD) | Dual-Port PCI Express to RS232/RS422/RS485 DB9 Serial Card, Windows/Linux, Standard/Low-Profile Brackets, ESD Protection

2-PORT PCIE SERIAL CARD: On-board DIP switches allow each DB9 serial port to operate in its own independent mode, enabling the connection of RS-232, RS-422, and RS-485 devices; LED indicators to monitor data transmit/receive status
CONFIGURABLE POWER: Dual-Port PCI Express Serial Adapter Card features configurable power of 12V (1.5A per port), 5V (1.5A per port), or no power (RI) over pin 9 via auxiliary SATA power; Per-Port power modes are individually configurable via jumpers
APPLICATIONS: Ideal for desktops and servers, with a wide range of uses such as point-of-sale terminals, PLCs, factory control and automation, scientific sensors, medical equipment, scanners, and oscilloscopes; DB9 ports work with screw-locking cables
STANDARD & LOW PROFILE BRACKETS: 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
TECH SPECS: Asix AX99100 Chipset; 16C450 and 16C550 UART compatible; 2x 9-Pin D-Sub Ports; Max Baud 921.6Kbps per port; 256 Byte FIFO; COM Retention; Supports Windows and Linux; Odd/Even/Mark/Space/None Parity Modes; 5/6/7/8/9 Data Bits; PCIe 2.0 x1
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13% Off

StarTech 4-Port PCI Express RS232 Serial Adapter Card, TAA (PEX4S953) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9 Card, 16950 UART, Windows & Linux, Expansion Card

4 PORT SERIAL CARD: Serial controller card w/ 16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer; Upgraded version of our popular Serial card PEX4S952
OPTIONAL CONFIGURABLE POWER: PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 4 ports are individually configurable; DB44 to 4x DB9 breakout cable incl
STANDARD PROFILE & LOW PROFILE BRACKET: PCI Express RS232 serial adapter card has standard bracket pre-installed & 1x low profile bracket incl for versatile install; Supports Windows XP and up & Linux
VERSATILE APPLICATIONS: For standard profile desktop/servers with uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope
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BZIZU 2-Port PCIe RS-232 DB9 Serial Port Card - Windows XP/7/8/10/11 & Linux Compatible (32/64bit) for Fast Data Transfer (PCIe1X Dual Serial Card)

Expansion Interface: Easily add 2 RS232 DB9 serial ports to desktop PCs or industrial devices via the motherboard's PCI Express slot, meeting a variety of device connection needs
Wide Compatibility: Seamlessly connect to DB9 serial devices such as POS systems, industrial testing and control equipment, security systems, logistics management devices, scanners, and printers, suitable for various application scenarios
Multi-Platform Support: Driver compatible with Windows XP, Vista, 7, 8.x, 10, 11 (32/64-bit) and Linux kernels 2.6.x, 3.x, 4.x, 5.x, ensuring smooth installation and use across different systems
Efficient Data Transmission: Utilizes the ASIX AX99100 solution, supporting 256-byte deep FIFO transmission, compatible with Intel, AMD, and ARM hardware platforms, providing stable serial data transmission performance
Flexible Installation: Comes with a standard full-size bracket for standard PCs, and includes 2 low-profile brackets for perfect compatibility with slim PCs. Based on the PCIe X1 interface, compatible with X1, X4, X8, and X16 slots
Important: Ensure your PC has an available PCIe slot, switch to the low-profile bracket for slim PCs, and install the correct driver from the Mini-CD for desktop use
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on Amazon.com
Our #1 Pick Today
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PCIE-SE2 2-Port PCI Express RS-232 DB9 Serial Port Card for Windows XP, Vista,7, 8.x, 10, 11 32/64bit and Linux PCs, PCIE RS232 Card, PCIE Serial DB9 Port Card

1. PCIE-SE2 allow users add 2X RS232 BD9 serial Ports on desktop PCs or industrial devices by motherboard PCI Express slot.
2. Seamless connect to serial DB9 ports device such as POS system, industrial testing and control device, security system, logistic management equipment, scanners and printers.
3. Need to install driver on Windows XP, Vista, 7, 8.x, 10, 11 (32/64bit) systems. Linux kernel 2.6.x, 3.x, 4.x, 5.x need to refer compile source code from the driver CD.
4. Selected by ASIX AX99100 solution supports on chip 256-byte depth FIFO in transmit. Works on Intel, AMD, ARM hardware platform.
5. The full-size bracket on this expansion card will works on standard size PCs. The 2X low profile bracket for slim PCs. Based on PCIE X1 interface, will works on X1, X4, X8, X16 slot.
6. ATTENTION: 1. Must make sure users PCs have empty PCIE slot.2. Slim PC users need change to low profile bracket by hand. 3.Please install correct driver from Mini-CD for desktop PCs.
Details & specs
Check Price
on Amazon.com
Disclaimer: While we make every effort to ensure accuracy, we cannot guarantee that all product specifications, pricing, discounts, and details are complete or error-free. Because information is subject to change, we recommend verifying all details directly with the retailer prior to making a purchase. As an Amazon Associate, we earn from qualifying purchases.

10 Serial Port Cards deals are available from: Amazon, starting from $16.99.

The biggest discount we found is 13% on StarTech 4-Port PCI Express RS232 Serial Adapter Card, TAA (PEX4S953) | PCIe RS232 Serial Host Controller Card, PCIe to Serial DB9 Card, 16950 UART, Windows & Linux, Expansion Card (PEX4S953) at Amazon.

The lowest price we found is $16.99 while the highest is $103.99. Prices for the best Serial Port Cards deals average at $45.67.