Best Serial Port Cards of 2025

The StarTech.com PCIe Serial Adapter is a versatile solution that allows you to connect a single DB9 port with bi-directional RS232 speeds of up to 460.8Kbps. With its 256-byte FIFO buffer, you can ensure smooth data transmission, making it ideal for various applications. The optional configurable power feature gives you the flexibility to choose between 12v, 5v, or none, enhancing usability. Additionally, it comes with both standard and low-profile brackets, allowing for easy installation in different types of desktops or servers.

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.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 DIGITUS Serial PCI Card offers a data transfer rate of up to 115.2Kbps, ensuring that your data moves swiftly and efficiently. With its plug and play functionality, you can easily set it up as the I/O address and IRQ are automatically assigned by the BIOS, saving you time and hassle. The on-chip hardware autoflow control guarantees that you won’t experience any data loss, which is crucial for maintaining the integrity of your information. Additionally, it supports various Windows operating systems, including Windows 7, Vista, and XP, making it a versatile choice for your connectivity needs.

The StarTech.com Serial PCIe Card is a versatile 2-port solution that allows you to connect RS-232, RS-422, and RS-485 devices independently. With on-board DIP switches, you can easily configure each port to suit your specific needs. The card also features configurable power options, providing flexibility for various applications. Additionally, LED indicators keep you informed about data transmit and receive status, enhancing your control and monitoring capabilities. This makes it an ideal choice for desktops and servers in diverse settings.

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 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.

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 Combo Card allows you to effortlessly add one parallel port and two RS-232 serial ports to your standard or low-profile computer using a PCI Express expansion slot. This means you can expand your connectivity options and connect additional devices, enhancing your setup. With its native PCI Express design, installation is straightforward, ensuring you can get up and running quickly. Additionally, the inclusion of the reliable 16550 UART ensures stable communication for your peripherals.

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.