EXSYS EX-3674 4-Port USB 3.0 to RS-232 Serial Adapter with Metal Housing and 15KV ESD Protection

Most USB-to-serial adapters compromise on either port count or signal integrity, but the EXSYS EX-3674 refuses to cut corners. It packs four true RS-232 ports into a rugged metal chassis, driven by an FTDI FT4232HL chipset that guarantees rock-solid compatibility across Windows, Linux, and macOS. Each port delivers up to 921.6 Kbps with full hardware and software flow control, while 15KV ESD protection shields your equipment from electrostatic discharge. Whether you're connecting legacy industrial devices, POS terminals, or lab instruments, this adapter provides the reliability and performance that built-in serial ports once offered.

Highlights

• Four independent RS-232 DB9 male ports, each with Tx/Rx LEDs for instant status monitoring
• SuperSpeed USB 3.0 interface with 5 Gbps bandwidth ensures zero bottleneck even under full load
• FTDI FT4232HL controller with 256-byte FIFO buffers per direction for smooth, lossless data streaming
• 15KV ESD protection on all serial lines prevents damage from static discharge
• Metal housing with wall-mount brackets included for secure installation in industrial environments
• Bus-powered operation with optional 5V DC jack for applications requiring extra power

In daily use

Imagine a busy service bench where a technician must simultaneously monitor a barcode scanner, a receipt printer, a modem, and a sensor array. The EX-3674 handles all four without a hitch—each port operates independently, so a slow device never holds up the others. The metal case dissipates heat efficiently and withstands knocks that would crack plastic adapters. The LEDs let you confirm data flow at a glance, eliminating guesswork during troubleshooting. And because it's powered by the USB bus, you can simply plug it into a laptop and go; no external power brick needed for most setups.

Full specifications

• Host interface: USB 3.0 Type-B female (backward compatible with USB 2.0/1.1)
• Device interface: RS-232 serial, 4 ports, DB9 male connectors
• Chipset: FTDI FT4232HL
• Data transfer rate: up to 921.6 Kbps per port
• USB speed: SuperSpeed 5 Gbps
• FIFO buffer: 256-byte transmit, 256-byte receive per port
• Flow control: hardware (RTS/CTS), software (XON/XOFF)
• Parity: none, even, odd, mark, space
• Data bits: 5, 6, 7, 8
• Stop bits: 1, 1.5, 2
• ESD protection: 15KV on RS-232 signals
• LED indicators: Tx/Rx per port
• Housing: metal
• Mounting: wall mountable with included brackets
• Power: USB bus-powered; optional 5V DC jack
• Operating temperature: 0°C to 55°C
• OS compatibility: Windows XP/Vista/7/8/10/11, Windows Server, Linux, macOS

Final note

For professionals who demand multi-port serial connectivity without sacrificing speed, durability, or driver support, the EXSYS EX-3674 is the definitive choice. Its industrial-grade build and FTDI reliability make it a long-term investment for any critical application.