EXSYS EX-42378 2-Port RS-232 PCI Express Serial Adapter Card, Low Profile

Industrial automation engineers and IT administrators often face the challenge of connecting legacy serial devices to modern computers that lack native COM ports. The EXSYS EX-42378 solves this by adding two high-performance RS-232 ports through a PCI Express x1 slot. Whether you're integrating barcode scanners, POS terminals, laboratory instruments, or CNC machines, this adapter ensures seamless communication with your existing equipment.

Key specifications

• Host Interface: PCI Express x1 (compatible with PCIe 1.1, 2.0, 3.0)
• Output Interface: 2 x RS-232 serial ports (DB9 male connectors)
• Chipset: ASIX AX99100 with 256-byte FIFO per port
• Baud Rate: Up to 921.6 Kbps per port
• Serial Protocol: RS-232 with full modem control and hardware/software flow control
• Data Bits: 5, 6, 7, 8; Stop Bits: 1, 1.5, 2; Parity: Even, Odd, None, Mark, Space
• Form Factor: Low profile with standard bracket included
• ESD Protection: 15KV HBM
• Operating Temperature: 0°C to 70°C
• OS Support: Windows 7/8/10/11, Windows Server, Linux Kernel 2.6.x and later
• Certifications: CE, FCC, RoHS

Why choose it

The EX-42378 delivers reliable serial connectivity with a robust ASIX chipset and large FIFO buffers to prevent data loss under heavy loads. Its low-profile design fits slim desktops and 2U rackmount servers, and the included standard bracket ensures compatibility with full-height cases. The card supports a wide range of operating systems, making it versatile for mixed environments. With 15KV ESD protection, your equipment is safeguarded against electrostatic discharge, ensuring long-term durability.

Ideal use cases

• Industrial automation: Connect PLCs, sensors, and control systems.
• Point-of-sale: Integrate receipt printers, cash drawers, and barcode scanners.
• Laboratory and medical: Interface with analytical instruments and diagnostic devices.
• Security systems: Attach access control panels and surveillance equipment.
• Legacy system upgrades: Add COM ports to new computers without serial headers.

Good to know

The adapter includes both low-profile and standard brackets, a driver CD, and supports hardware flow control (RTS/CTS) and software flow control (XON/XOFF). It is fully compliant with PCI Express specifications and comes with a comprehensive driver package for Windows and Linux. The card is RoHS compliant and backed by EXSYS quality.