EXSYS EX-3681 PCI Express RS232 Serial Adapter Card

Expand your system with a reliable RS232 serial port through this PCI Express x1 adapter card. The EXSYS EX-3681 delivers high-speed serial connectivity up to 921.6 Kbps, making it ideal for legacy industrial devices, POS terminals, and laboratory instruments.

Advantages

Built around the ASIX AX99100 chipset, this card ensures stable performance and broad compatibility with Windows and Linux. A 256-byte FIFO buffer reduces CPU overhead, while 15KV ESD protection safeguards your hardware from electrostatic discharge. The included low-profile bracket allows installation in slim desktops and servers.

Suitable for

• Connecting serial printers, barcode scanners, and CNC machines
• Industrial automation and control systems
• Legacy equipment requiring a DB9 RS232 port
• Point-of-sale (POS) terminals and kiosks
• Laboratory and scientific instruments

Key specifications

• PCI Express x1 interface (PCIe 2.0, 2.5 Gbps)
• One RS232 serial port with DB9 male connector
• Data transfer rate up to 921.6 Kbps
• 256-byte FIFO buffer per port
• Hardware and software flow control (RTS/CTS, XON/XOFF)
• 15KV ESD protection on all RS232 signals
• Supports Windows (Server 2003–2019, XP–11) and Linux kernel 2.6.x+
• Includes low-profile bracket
• Operating temperature: 0°C to 70°C

Recommendations

For reliable serial connectivity in modern systems, the EX-3681 offers a straightforward upgrade path. Its robust design and broad OS support make it a dependable choice for both office and industrial environments.