EXSYS EX-3675 2-Port RS-232 PCI Express Serial Adapter Card with Low Profile Bracket

In industrial automation, point-of-sale terminals, and legacy laboratory equipment, reliable serial communication is non-negotiable. The EXSYS EX-3675 equips a desktop workstation or server with two native RS-232 ports over a single PCI Express x1 slot, eliminating the instability of USB-to-serial converters. Each port delivers data rates up to 921.6 Kbps with a 128-byte FIFO buffer, ensuring smooth handling of high-throughput data streams from barcode scanners, CNC machines, or network switches.

Key specifications

• Host interface: PCI Express x1 (compatible with x1, x4, x8, x16 slots)
• External ports: 2 × RS-232 DB9 male
• Chipset: MosChip MCS9901CV
• Data transfer rate: up to 921.6 Kbps per port
• FIFO buffer: 128-byte transmit/receive per port
• Serial communication: RS-232, supports parity (Even, Odd, None, Mark, Space), data bits (5, 6, 7, 8), stop bits (1, 1.5, 2), flow control (None, Xon/Xoff, RTS/CTS, DTR/DSR)
• Operating systems: Windows XP/Vista/7/8/10/11, Server 2003/2008/2012/2016/2019, Linux Kernel 2.6.x and higher
• Low profile bracket included
• Certifications: CE, FCC, RoHS

Why choose it

Unlike software-based USB adapters, this card uses a dedicated PCIe chipset for true hardware serial ports, reducing latency and CPU load. The included low-profile bracket allows installation in slimline or small form factor PCs, while the standard bracket supports full-height cases. Broad OS support ensures compatibility with both modern and legacy systems.

Ideal use cases

• Connecting legacy industrial equipment (PLC, CNC, barcode scanners) to modern PCs
• Point-of-sale systems requiring multiple RS-232 peripherals
• Server management via serial console
• Laboratory instruments and scientific data acquisition

Good to know

The card operates in temperatures from 0°C to 70°C and can be stored from -20°C to 85°C, with humidity tolerance up to 95% non-condensing. It is RoHS compliant and backed by EXSYS quality.