Best Serial Port Cards for PCI of 2025

The StarTech.com PCIe RS232 Serial Adapter Card is a 1-port controller card that enables bi-directional RS232 speeds up to 460.8Kbps per port. It supports low/standard profile desktop/servers and is ideal for point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope. The card comes with a low profile bracket pre-installed and 1x full profile bracket is included for versatile installation. The IT Pro's Choice, it is designed and built for IT professionals and is backed for life, including free lifetime 24/5 multi-lingual technical assistance.

The StarTech.com 2-port PCI Express RS232 Serial Adapter Card is a versatile expansion card that allows for bi-directional RS232 speeds up to 460.8Kbps per port. It provides a choice of 12v, 5v, or no optional configurable power through pin 9, and comes with a standard profile and low profile bracket. This PCIe multiport serial card supports both Windows and Linux, making it suitable for use in point of sale terminals, control/automation in factories, medical equipment, and more. It is designed and built for IT professionals, offering free lifetime technical assistance.

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.

axGear RS-232 PCI Card is a user-friendly product that offers Plug and Play functionality, automatically assigning IRQ and I/O address for easy setup. You have the flexibility to manually adjust the port number of the additional serial port card, providing customization options. This card supports PCI IRQ sharing, ensuring compatibility with various systems. It follows the PCI Rev2.1 Agreement and features standard input and output of 16C550 UART with a 16-byte FIFO for efficient data transmission and reception.

The StarTech.com 4 Port PCI Express RS232 Serial Adapter Card features a native single chip design, a full profile and low profile/half-height bracket, 256-byte depth FIFO in transmit/receive path of each port, Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps, and supports hardware and software flow control. This card is ideal for those who need to connect multiple serial devices to their computer, such as modems, printers, and scanners.

The StarTech.com 2-Port PCI Express Serial Card is designed to meet industry standards and is compatible with a wide range of applications. It is a dual port DB9 to PCIe adapter that delivers high-performance serial communication, with support for data transfer rates of up to 460Kbps. The installation is simple as 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.

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 StarTech.com Low Profile Native RS232 PCI Express Serial Card features a high-speed RS232 serial port with a data transfer rate of up to 460.8 Kbps. It comes with a half-height/low profile mounting bracket and an optional standard profile bracket. The single-chip design optimizes speed and reliability. Additionally, the PCIe card has a selectable power output on pin 9 for the serial port.

The StarTech.com PCI Serial Parallel Combo Card is an add-on card for computers with a PCI expansion slot. The card includes two RS-232 serial ports and one parallel port. These ports share only one IRQ, reducing the system resources required to operate the card. The card is ideal for users who need to connect legacy serial and parallel devices to a modern computer.

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.