Reliable PCI-E 2-Port RS232 Card with Dual DB9 Interfaces

Expand Your System with Two RS232 Connections

The PCI-E 2-port RS232 Card provides a practical way to add two independent serial communication interfaces to a desktop computer. Designed for systems that require dependable RS232 connectivity, it helps connect compatible serial equipment without relying on external conversion devices.

Two 9-pin RS232 ports allow a single computer to communicate with two serial devices. This configuration is useful when existing onboard serial ports are unavailable or insufficient. It can support system integration, equipment maintenance, device configuration, data acquisition, and other applications that continue to depend on established RS232 communication.

Installation through a PCI Express interface creates a direct internal connection while keeping both serial ports accessible from the computer’s rear panel. Its compact expansion-card format also helps maintain an organized workstation with fewer external adapters and cables.

Stable Dual-Channel Serial Communication

Compliance with the PCI Express 1.0a standard supports integration with compatible PCI Express systems. The PCI Express interface operates at 2.5 Gb/s and supports full-duplex communication across two serial channels, enabling data to be transmitted and received in both directions.

A 16C650 UART architecture manages serial communication, while the integrated 256-byte transmit-and-receive FIFO buffer assists with temporary data storage. This buffering capability can reduce the processing pressure caused by frequent serial data transfers and help maintain more consistent communication between the host computer and connected devices.

Serial transfer rates reach up to 115200 bps. Users can select an appropriate speed according to the communication requirements of their connected hardware.

Technical Specifications

Flexible Serial Port Configuration

Different serial devices may require different communication parameters. This PCI-E RS232 card supports 5, 6, 7, or 8 data bits, allowing it to accommodate several common data formats.

Parity can be configured as none, even, odd, space, or mark. One-bit and two-bit stop settings are also available. These adjustable parameters make it easier to match the card with the operating requirements of compatible serial equipment. Before deployment, users should confirm that the baud rate, data bits, parity, and stop bits are identical on both communicating devices.

Supported Operating Systems

The listed operating system compatibility includes:

• Windows 7, Windows 8, Windows Vista, Windows XP, and Windows 2000 in 32-bit environments

• Windows 7, Windows 8, Windows Vista, Windows XP, and Windows Server 2003 in 64-bit environments

• Linux kernel 2.6.x

Operating system edition, architecture, available PCI Express slot, and driver requirements should be checked before ordering. Compatibility with operating systems not listed above should be confirmed separately.

Suitable Application Scenarios

The PCI-E 2-port RS232 Card is designed for desktop computers that require additional serial communication ports. By adding two independent 9-pin RS232 interfaces through one PCI Express slot, it allows two compatible serial devices to be connected and managed simultaneously.

Common application scenarios include:

• Industrial Equipment Communication: Connect compatible controllers, instruments, monitoring units, or other equipment that communicates through an RS232 interface.

• Legacy Device Integration: Continue using older serial devices with newer desktop computers that no longer include built-in RS232 ports.

• Testing and Maintenance Workstations: Establish serial connections for equipment configuration, diagnostics, parameter adjustment, firmware-related operations, or maintenance tasks.

• Data Acquisition Systems: Receive serial data from compatible measuring devices, sensors, counters, or recording equipment for storage and analysis on a computer.

• System Monitoring: Connect monitoring terminals or communication devices that regularly transmit operating status, logs, or measurement information.

• Laboratory and Engineering Use: Support communication between computers and compatible test instruments during development, verification, and technical research.

• Commercial Serial Equipment: Add serial connectivity for compatible printers, scanners, card readers, display units, or other RS232 peripherals.