InLine PCI Multi I/O Controller Card with 2 DB9 Serial Ports, Internal Host Interface for Windows and Linux Systems

The InLine PCI Multi I/O Controller Card with 2 DB9 Serial Ports is designed to expand the connectivity of desktop computers by adding two reliable RS232 serial interfaces. Featuring an internal PCI host interface and utilizing the proven CH351Q chipset, this controller card ensures stable data communication for legacy hardware, industrial control systems, and specialized equipment. It delivers high transfer speeds of up to 2 Mbps and offers broad compatibility with numerous operating systems, making it a dependable solution for both office and industrial environments.

Advantages

This controller card provides a straightforward method for integrating older serial devices into modern or existing desktop systems without requiring complex external adapters. The inclusion of two male DB9 serial ports allows simultaneous connection of multiple peripherals. Hardware handshake support through CTS/RTS ensures reliable data flow management, while the 16-byte FIFO buffer per connection enhances transmission efficiency. Built to operate within standard thermal ranges, the card maintains consistent performance under continuous use in various professional settings.

Suitable for

• Connecting legacy serial printers and scanners to desktop computers
• Integrating industrial control systems and automation machinery
• Managing specialized scientific or medical measurement equipment
• Setting up serial networks and programming microcontroller boards

When it may not be suitable

This product is not suitable for modern desktop computers that lack traditional PCI expansion slots, as it requires a physical PCI bus interface. It cannot be used in laptops or systems equipped exclusively with PCIe slots. Furthermore, it does not support high-speed USB or network peripherals, as its output is strictly limited to serial communication.

Key specifications

• Host interface: PCI V2.2
• Output interface: 2 x DB9 male serial ports
• Chipset: WCH CH351Q
• UART compatibility: 16C450, 16C550, 16C552
• FIFO buffer: 16 bytes for sending and receiving per connection
• Maximum transfer rate: Up to 2 Mbps
• Supported operating systems: Windows 98SE through 11, Windows Server editions, Linux Kernel 2.4.x and newer
• Physical dimensions: Width 125 mm, Depth 1.35 mm, Height 125 mm
• Operating temperature range: 0° C to 55° C

How to use

Before installation, ensure the computer is powered off and disconnected from the power source. Open the computer case and insert the InLine PCI Multi I/O Controller Card firmly into an available PCI slot, securing the bracket to the chassis. Close the computer case, reconnect the power, and boot the system. The operating system should detect the new hardware, allowing you to install the appropriate drivers if required. Once drivers are active, connect your serial cables to the DB9 ports and configure the communication parameters within your operating system or application software.

What to consider before purchase

• Verify that your computer motherboard features an available and compatible PCI expansion slot rather than a PCIe slot.
• Check the operating system version of your computer to ensure driver compatibility.
• Confirm that your external devices utilize standard RS232 serial communication with DB9 connections.

Always ensure the computer is completely powered off and unplugged before opening the chassis and installing internal expansion cards to prevent electrical damage.