StarTech.com 6ft RS422/485 USB Serial Adapter with COM Retention

The StarTech.com 6ft RS422/485 USB Serial Adapter with COM Retention is the dependable bridge you need to connect RS422 or RS485 serial devices to a USB-enabled computer. Built for professionals who demand reliability in industrial, laboratory, or field environments, this adapter delivers stable serial communications without sacrificing convenience. Its compact, robust design houses a 9-pin DB9 male serial connector and a long, flexible 6-foot cable, making it easy to reach devices that are tucked away or spread across a workspace. Whether you’re integrating legacy equipment, collecting sensor data, or controlling remote equipment, this USB-to-serial solution provides a seamless, ready-to-use interface that minimizes setup time and maximizes performance.

With RS422 and RS485 support, the adapter accommodates a wide range of serial devices—allowing differential signaling for longer cable runs and improved noise immunity. The DB9 male connector ensures compatibility with many existing serial devices and equipment that still rely on this widely adopted interface. The combination of USB connectivity and differential serial signaling makes this adapter ideal for data loggers, PLCs, CNC machines, measurement equipment, and other devices that require robust, low-latency serial communication. The COM Retention feature is a standout benefit, keeping your software configuration intact even when the adapter is unplugged and reconnected, which reduces downtime and eliminates the need to reconfigure ports after every reconnect.

Designed to be practical in real-world setups, the 6-foot cable length provides generous reach while keeping the footprint compact enough for crowded desktops, machine panels, or equipment racks. The unit is USB-powered, so there’s no extra power brick to manage, and it supports convenient plug-and-play installation on many operating systems. When you require a reliable connection for serial devices over USB, this StarTech adapter delivers predictable performance and steady COM port behavior, helping you maintain consistent control and data exchange across your applications.

In addition to its core capabilities, this adapter emphasizes ease of use and long-term value. The durable construction and straightforward interface minimize the technical overhead often associated with serial communications. It’s a versatile tool for developers, technicians, and engineers who need a dependable solution for connecting RS422/RS485 devices to modern computers. By consolidating the complexity of translating USB to serial into a single, well-supported device, StarTech makes it simpler to modernize setups that still rely on proven serial devices. The result is a flexible, future-proof option that reduces integration friction while preserving the performance benefits of RS422/RS485 signaling.

• RS422 and RS485 support for flexible serial communication in noisy environments and for longer cable runs
• 6-foot USB cable provides ample reach to connect devices across desks, benches, or equipment racks
• 9-pin DB9 male serial connector for compatibility with a wide range of legacy and modern serial devices
• COM Port Retention ensures stable, persistent COM port assignments across reconnects
• Compact, durable USB-to-serial adapter with plug-and-play capabilities and broad OS driver support

Technical Details of StarTech.com 6ft RS422/485 USB Serial Adapter with COM Retention

• Interface: USB to RS422/RS485 serial adapter
• Connector: 9-pin DB9 male serial port
• Cable length: 6 feet (approx. 1.8 meters)
• Signal support: RS422 and RS485 differential signaling
• COM Port Retention: maintains consistent COM port assignments across reconnects
• Power: USB-powered bus-powered device
• Driver compatibility: supports Windows, macOS, and Linux with available drivers
• Physical build: compact, durable form factor suitable for desktop use and industrial environments

How to install StarTech.com 6ft RS422/RS485 USB Serial Adapter w/ COM Retention

• Step 1: Plug the USB connector into an available USB port on your computer. The device should begin enumeration automatically on many systems.
• Step 2: Connect your RS422/RS485 device to the DB9 male connector in the correct wiring configuration as specified by your device's documentation.
• Step 3: If prompted, install the latest drivers from StarTech’s official website or allow the operating system to install the generic USB-serial drivers. Driver availability covers Windows, macOS, and Linux platforms.
• Step 4: Verify that a new COM port has been assigned by checking your system’s device manager (Windows) or the equivalent serial port listing on macOS/Linux. The COM Port Retention feature will help maintain a stable port name across reconnections.
• Step 5: Configure your serial communication program to use the COM port assigned to the adapter, set the appropriate baud rate, parity, stop bits, and flow control as required by your RS422/RS485 device.

Frequently asked questions

• Q: What is COM Port Retention? A: COM Port Retention keeps the COM port assignment consistent for the USB-to-Serial adapter across disconnects and reconnects, reducing reconfiguration in software that relies on fixed port names.
• Q: Can I use this adapter with both RS422 and RS485 devices? A: Yes. The adapter supports both RS422 and RS485 signaling, giving you flexibility to connect to a variety of serial devices and networks.
• Q: What is the length of the included cable? A: The adapter ships with a 6-foot USB cable, providing ample reach for most workstation or equipment layouts.
• Q: Is the adapter powered by USB? A: Yes. It is a bus-powered USB device, requiring no external power supply for typical use.
• Q: Which operating systems are supported? A: StarTech provides drivers and compatibility for Windows, macOS, and Linux, ensuring broad cross-platform support for this USB-to-serial solution.
• Q: Do I need professional installation to use this adapter? A: Most users can install and configure the device with basic driver updates and simple serial port settings. The process is designed to be straightforward and plug-and-play on supported systems.