Best Serial Port Cards for PCI of 2026

The StarTech PCIe Serial Card is a reliable solution for adding a single RS232 serial port to your desktop or server. It supports high-speed data transfer up to 921.6Kbps, making it ideal for smooth communication with various devices. You can choose from 12v, 5v, or no power output on pin 9, giving you flexibility depending on your hardware needs. The card comes with both low profile and full profile brackets, so you can easily install it in different PC cases. Plus, it works with both Windows and Linux, providing broad compatibility for your system.

StarTech Serial Adapter Card is a 2-port PCI Express RS232 controller card that allows you to add two DB9 serial ports to your desktop or server. It is based on ASIX AX99100 and has a 16950 UART, which provides bi-directional RS232 speeds of up to 921.6Kbps per port with an available 256 byte FIFO buffer and 9th data bit. This upgraded version of the popular PEX2S952 card provides optional configurable power with a choice of 12V, 5V, or none through pin 9 with up to 2A total, and each of the two ports is individually configurable. The card comes with a standard profile bracket pre-installed and two low profile brackets included for versatile installation. It is compatible with both Windows and Linux operating systems. The StarTech Serial Adapter Card is an ideal solution for point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, and oscilloscopes.

The StarTech 4-Port Serial Card offers four RS232 ports that support fast data transfer speeds up to 921.6Kbps each, making it ideal for connecting multiple serial devices efficiently. It features a 256-byte FIFO buffer, which helps reduce data loss during busy transmissions. You can customize the power supplied to each port individually, choosing between 12V, 5V, or no power, which adds flexibility when powering different connected devices. The card comes with both low profile and standard brackets, allowing easy installation in a variety of desktop and server setups. Compatible with Windows and Linux, this card is a practical choice for diverse serial communication needs.

The Syba RS232 Serial Adapter Card is a highly efficient and versatile PCI Express card that allows you to easily add a single serial DB9 port to your computer. Equipped with the MCS9922 chipset, this card is fully compliant with the PCI-Express base Specification Revision 1.0a and offers a single-lane (x1) PCI-Express with a throughput of up to 2.5Gbps. With a transfer data rate of up to 250Kbps on each port, this card supports 5, 6, 7, and 8-bit serial formats and features a 256-byte depth FIFO in transmit. The hardware and software flow control ensure smooth and reliable data transmission. Its low profile form factor makes it suitable for various computer setups. Whether you need to connect industrial equipment, modems, or other serial devices, the Syba RS232 Serial Adapter Card provides a convenient and reliable solution.

The StarTech PCIe Serial Card lets you easily connect RS232 serial devices like barcode scanners, receipt printers, and medical tools to your computer. It uses a high-performance 16C1050 UART chip, ensuring smooth and reliable data transfer. You can quickly check the connection status thanks to built-in LED lights, which provide visual feedback on activity. This card also supports power delivery through pin 9, supplying 5V or 12V to compatible devices, reducing the need for extra power sources. Plus, it comes with both standard and low-profile brackets, making it easy to install in various PC cases.

LinksTek 2-Port PCI Express RS-232 DB9 Serial Port Card allows users to add two RS232 BD9 serial Ports on desktop PCs or industrial devices through a PCI Express slot. It seamlessly connects to serial port devices, such as POS systems, industrial testing and control devices, security systems, logistic management equipment, scanners and printers. It requires driver installation on Windows and Linux systems. This card features the ASIX AX99100 solution, which supports on-chip 256-byte depth FIFO in transmit and can work on INTEL, AMD, ARM hardware platforms. The expansion card has a full-size bracket for standard size PCs and two low profile brackets for slim PCs. It can work on PCIe X1, X4, X8, and X16 slots.

The StarTech 2-Port Serial Card is a versatile solution for connecting various RS-232, RS-422, and RS-485 devices. With its on-board DIP switches, you can easily configure each DB9 port to operate independently, which is perfect for managing different devices simultaneously. The card also features configurable power options, allowing you to tailor the power supply to meet your specific needs. Additionally, the card is compatible with both standard and low-profile brackets, making it suitable for a range of desktop and server setups. LED indicators help you monitor data transmission status, ensuring smooth operation.

The XRIKUI Dual Port Serial card offers two separate RS-232 serial ports, allowing you to connect multiple serial devices at once, which greatly boosts your computer’s connectivity options. It supports a wide range of Windows versions and Linux kernels, so you can easily find and install the right drivers for your system. The card uses the ASIX AX99100 chip, which ensures smooth data transfer with a deep FIFO buffer, making it reliable for different hardware like Intel, AMD, and ARM platforms. Plus, it includes both full-size and low-profile brackets, so you can install it in standard PCs or compact 2U systems with ease.

The StarTech PCIe Serial Card offers four RS232 ports, each capable of fast data transfer speeds up to 921.6Kbps, making it perfect for reliable serial communication. It features a 256-byte FIFO buffer that helps improve data flow and reduces lag. You can customize the power supply on each port, choosing between 12V, 5V, or no power, which adds flexibility depending on your device needs. The card comes with both standard and low-profile brackets, allowing easy installation in various computer cases. It supports multiple operating systems, including Windows and Linux, so you can use it in many setups without hassle.