StarTech.com USB to Null Modem Serial Adapter, FTDI, USB-A to DB9 RS232, Windows/macOS/Linux

StarTech.com 6.6ft (2m) USB to Null Modem Serial Adapter Cable | FTDI Chipset

This StarTech.com 6.6ft (2m) USB to Null Modem Serial Adapter Cable, COM Retention, FTDI, USB-A to DB9 RS232, Interchangeable DB9 Screws/Nuts, Windows/macOS/Linux adds an RS-232 null modem port via a USB-A port. It targets engineers and technicians connecting legacy serial hardware to modern PCs. The key USP is built-in COM retention and the FTDI chipset for stable drivers.

StarTech.com 6.6ft (2m) USB to Null Modem Serial Adapter Cable, COM Retention, FTDI, USB-A to DB9 RS232, Interchangeable DB9 Screws/Nuts, Windows/macOS/Linux

Specifications

Reliable Serial Connectivity for Legacy Kit

This adapter provides RS-232 DCE support over USB-A. It resolves DCE/DTE conflicts without extra cross-wired cables. Because it uses a null modem pinout, it links directly to serial devices. So you can maintain existing workflows without rewiring.

FTDI Chipset with COM Port Retention

The FTDI FT232R chipset offers proven driver support across platforms. COM retention reassigns the port value after disconnects or reboots. However, verify automatic driver installation for your OS version. In practice, this reduces setup time for repeated connections.

Interchangeable DB9 Hardware for Fit

The adapter includes removable thumbscrews and DB-9 nuts for mounting. You can secure it to different serial peripherals or panel mounts. Because the connectors are straight form factor, alignment is straightforward. Also check your device’s screw thread and panel clearance before purchase.

LED Diagnostics and Shielded Build

Data and receive LEDs show real-time port activity. A USB LED confirms successful enumeration. Copper shielding helps minimise EMI and RFI. Gold-plated connectors enhance signal conductivity, while rugged TPE and Level-4 ESD protection support longevity.

Wide OS Compatibility

Support spans Windows 7 through Windows 11, plus Windows Server editions. macOS 10.9 to macOS 14 is supported. Linux is supported, and ChromeOS is listed as compatible. If you use a niche Linux kernel, confirm driver availability before ordering.

What is in the box

• 1 × StarTech.com USB to Null Modem Serial Adapter Cable (2 m)
• Interchangeable DB-9 thumbscrews and nuts
• Manual (included)

Check before you buy

• Confirm your device uses a DB-9 RS-232 null modem connection, not straight-through.
• Verify your computer has a USB-A port and OS version matches the supported list.
• Check physical clearance for DB-9 screws or nuts on your enclosure or panel.
• Confirm the required COM port behaviour for your application with COM retention.

Questions and answers

Summary & warranty

Choose this adapter if you need a dependable null modem link from USB-A to DB-9 RS-232 across Windows, macOS, and Linux. It suits engineers maintaining legacy equipment, field technicians, and lab environments requiring COM retention and FTDI stability. Covered by the applicable manufacturer warranty.