Best Serial Port Cards of 2026

The Sxhlseller Serial Port Card allows you to add two RS232 DB9 serial ports to your desktop or industrial equipment via a PCI Express slot. This card features a PCIE X1 interface, making it compatible with various slot sizes and ensuring easy installation. It supports multiple operating systems, including Windows and Linux, providing flexibility for different users. Additionally, with a 256 byte depth FIFO transfer capability, it is ideal for handling data efficiently in applications such as POS systems, scanners, and printers.

The Zerone Serial Card is designed to enhance your computer's connectivity with its PCI-E to RS232 functionality. This card supports a PCI-Express rate of 2.5Gb/s, ensuring a reliable and fast connection for your devices. With compatibility for standard 16c550 UART and a 256-byte FIFO, you can expect efficient data handling. Furthermore, it boasts a high-speed data transfer rate of up to 250k/sec, making it ideal for tasks that require quick data exchange. Plus, the plug-and-play feature allows for easy installation, so you can start using it right away.

The StarTech.com RS232 Card allows you to add two high-speed RS-232 serial ports to your low profile or small form factor computer. This is particularly useful if you need to connect legacy devices that rely on serial communication. With the PCI Express expansion slot, installation is straightforward, enabling you to enhance your system's connectivity without hassle. Additionally, the card is designed to fit compact spaces, ensuring that you do not compromise on performance in a smaller setup.

The StarTech PEX2S953 Card is a versatile serial adapter that provides two DB9 ports with fast bi-directional RS232 communication, reaching speeds up to 921.6Kbps. This ensures smooth and reliable data transfer for your devices. You can configure the power supply on each port individually, choosing between 12v, 5v, or no power, which adds flexibility for various connected equipment. The card includes both standard and low-profile brackets, making installation in different desktop or server setups easy. It supports multiple operating systems, including Windows and Linux, making it a practical choice for diverse uses.

The StarTech PEX2S1050 Serial Card is designed to meet PCI Express 1.0a standards, ensuring it fits a variety of PCIe slots from 1x to 16x. This means you can upgrade your system easily without worrying about compatibility. Its dual port DB9 connection is perfect for connecting manufacturing, POS, or security equipment, giving you flexibility in many setups. With data transfer speeds up to 460Kbps, it offers reliable, high-performance communication for your devices. Installation is straightforward, featuring plug-and-play support and adjustable brackets for both standard and low-profile cases, saving you time and effort.

The StarTech.com Serial Adapter Card allows you to easily add four RS-232 serial ports to your computer via a PCI express expansion slot. This feature is especially useful if you need to connect multiple serial devices simultaneously, enhancing your productivity. The card is compatible with both standard and small form factor computers, offering great versatility. With its low-profile design, it fits conveniently into your system while maintaining high performance for your serial communication needs.

The Richer-R PCI-E SATA Card is a handy expansion adapter that allows you to connect SATA 3.0 devices to your computer via a PCI Express slot. It works well with both large and small chassis and supports the IDE and AHCI programming interfaces, giving you flexibility in how you use it. The card is plug and play, meaning you can add or remove devices without shutting down your system, which is very convenient. It also complies with SATA 3.0 and PCI-E 2.0 standards, ensuring fast and reliable data transfer at a full 6GBPS bandwidth.

The Bewinner PCI Serial Card is designed to offer easy expansion of serial ports on your desktop. It supports the PCI 2.1 specification with a 32-bit PCI bus, allowing for plug-and-play installation with automatic IRQ and I/O address allocation, so you won’t have to worry about complex setup. You can connect multiple serial cards to one host, giving you flexibility if you need more ports. The card supports various data bits, parity bits, and stop bits, which ensures compatibility with different serial devices and communication standards, making it a versatile addition to your system.

The StarTech.com PCI Combo Card allows you to expand your computer's capabilities by adding one DB25 parallel port and two DB9 RS232 ports. This means you can easily connect printers, scanners, and other devices. With support for various parallel speeds and modes, you will enjoy fast and efficient data transfer. Additionally, the card is compatible with multiple operating systems, ensuring versatility in your setup. You can also choose between standard and low profile brackets for installation, making it adaptable to your needs.

The StarTech.com PCIe Serial Card features a native single chip design, ensuring reliable performance for your serial connections. With the inclusion of both full profile and low profile/half-height brackets, you can easily install it in various systems. Each port is equipped with a 256-byte depth FIFO, enhancing data handling for transmit and receive tasks. Additionally, the single-lane PCI-Express interface offers impressive throughput of up to 2.5Gbps, making it ideal for fast and efficient data transfer.