EXSYS EX-44343-2S 2-Port RS-232 PCI Express Serial Card, MosChip MCS9901, Low Profile

Connect legacy RS-232 serial devices to modern desktop systems with the EXSYS EX-44343-2S PCI Express serial card. Ideal for industrial automation, point-of-sale terminals, laboratory instruments, and other equipment that still relies on serial communication. The card installs into a standard PCIe x1 slot and provides two DB9 male ports, enabling reliable data transfer at up to 921.6 Kbps per port.

Key specifications

• Host interface: PCI Express x1
• Output interface: RS-232
• Serial ports quantity: 2
• Connector: DB9 male
• Chipset: MosChip MCS9901
• Baud rate: 921.6 Kbps
• FIFO buffer: 128-byte per port
• Flow control: Hardware (RTS/CTS), Software (XON/XOFF), None
• Data bits: 5, 6, 7, 8
• Stop bits: 1, 1.5, 2
• Parity: Even, Odd, None, Space, Mark
• ESD protection: 15KV
• Operating systems: Windows (32/64-bit), Linux

Why choose it

The EX-44343-2S is based on the proven MosChip MCS9901 controller, ensuring broad compatibility and stable performance. It supports both standard and low-profile brackets, making it suitable for slim desktop cases. Plug-and-play installation simplifies setup, and IRQ sharing reduces resource conflicts.

Ideal use cases

• Connecting barcode scanners, receipt printers, or cash drawers in retail environments
• Interfacing with CNC machines, PLCs, or sensors in industrial settings
• Adding serial ports to modern computers for legacy laboratory or medical equipment
• Expanding serial connectivity in servers or embedded systems

Good to know

The card is compatible with PCI Express x1, x4, x8, and x16 slots, providing flexibility in system configuration. It supports a wide range of serial parameters, allowing customization for various devices. The included low-profile bracket enables installation in compact form factor PCs.