Opengear CM8004 4-Port RS232 PCI Express Serial Card

Many modern computers lack native serial ports, yet countless industrial, point-of-sale, and networking devices still rely on RS232 connections. The Opengear CM8004 solves this by adding four high-performance RS232 ports through a single PCI Express x1 slot, enabling reliable communication with legacy and specialized equipment.

Who is it for

System integrators, IT administrators, and industrial users who need to connect multiple serial devices—such as barcode scanners, CNC machines, routers, and sensors—to a desktop or server. It is ideal for environments where stability and broad OS compatibility are critical.

Main features

• Four RS232 ports via one PCIe x1 slot, each with a DB9 male connector.
• ASIX AX99100 chipset delivers high-speed data rates up to 921.6 Kbps.
• 256-byte FIFO buffer per port reduces CPU load and prevents data loss.
• Supports flexible serial configurations: 5/6/7/8 data bits, 1/1.5/2 stop bits, and parity options (Even, Odd, None, Mark, Space).
• Hardware and software flow control (RTS/CTS, XON/XOFF) for reliable data transfer.
• Compatible with Windows (XP through 11) and Linux kernel 2.6.x and above.
• Includes both standard and low-profile brackets for versatile installation.
• CE, FCC, and RoHS certified for quality and environmental compliance.

Specifications

• Interface: PCI Express x1 (PCIe 1.0a)
• Ports: 4x RS232, DB9 male
• Chipset: ASIX AX99100
• Max baud rate: 921.6 Kbps
• FIFO: 256 bytes per port
• Data bits: 5, 6, 7, 8
• Stop bits: 1, 1.5, 2
• Parity: Even, Odd, None, Mark, Space
• Flow control: None, Hardware (RTS/CTS), Software (XON/XOFF)
• Operating temperature: 0°C to 70°C
• Storage temperature: -20°C to 85°C
• Humidity: 5% to 95% RH (non-condensing)

Tips

For optimal performance, install the latest drivers from the Opengear website and ensure the PCIe slot is not shared with other high-bandwidth devices. Use shielded serial cables to minimize interference in industrial environments.