SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
4.4Editor score
Prolific PL2303GS Chipset
Fixed hex standoffs
Bus powered design
In this guide
Finding the right D Sub to USB Adapter ensures your legacy serial hardware connects seamlessly to modern computers without sacrificing data integrity or performance during daily operations.
We evaluated ten leading adapters based on chipset reliability, cable length, driver support, and compatibility with Windows, Mac, and Linux systems to help you choose the most suitable option.
Each pick highlights key strengths and potential limitations so you can match the adapter to your specific needs. Keep in mind that product prices and availability may change over time.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
4.6Editor score
FTDI Chipset for reliability
Wide OS compatibility
Gold Plated connectors
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
4.6Editor score
Up to 230 Kbps speed
LED status indicator
Three year warranty
Top 10 Best D Sub to USB Adapter in 2026 Compared
This side-by-side comparison highlights the critical specifications of each adapter including chipset type, cable length, supported operating systems, and maximum data transfer rates.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 FTDI Adapter
FTDI Chipset
6 feet length
Windows Mac Linux
1 Mbps rate
4.6Editor score
Editor's Choice
IOGEAR USB to PDA Serial Adapter
USB 1.1 2.0
12 inches length
PC Mac drivers
LED status light
4.7Editor score
Best Budget
SABRENT USB 2.0 to Serial DB9
Prolific Chipset
Fixed standoffs
All 9 signals
1 year warranty
4.4Editor score
BENFEI USB to Serial Adapter
Prolific Chipset
6 feet length
Triple shielding
18 month warranty
4.2Editor score
StarTech.com 1 ft USB to RS232
COM Port Retention
1 foot length
Windows Linux Mac
920 kbps rate
4.5Editor score
TRIPP LITE Keyspan High-Speed Adapter
230 Kbps speed
3 foot length
LED status light
3 year warranty
4.6Editor score
StarTech 17in USB to Serial Adapter
43cm cable length
921.6 Kbps
Prolific Chipset
3 year warranty
4.6Editor score
DTECH 10 Feet USB to RS232
FTDI Chipset
10 feet length
Gold plated connectors
Windows Mac Linux
4.6Editor score
UGREEN 6FT DB9 Male USB to Serial
PL2303 Chipset
6 feet length
256kbps rate
PVC jacket
4.6Editor score
StarTech 3ft 1-Port USB to Serial
Prolific Chipset
3 foot length
230.4 Kbps
DB9 DB25
4.5Editor score
1. USB to RS232 FTDI Adapter – Best Overall D Sub to USB Adapter
USB to RS232 USB Serial Adapter with FTDI Chipset
FTDI Chipset ensures reliability
Six feet cable length provided
Supports major operating systems
Gold plated connector design
This USB to RS232 adapter stands out as a top choice for users requiring stable serial connections to legacy hardware. It carries a strong rating and is built around the FTDI chipset which is known for consistent performance and driver stability across diverse computing environments.
Pros
- Highly reliable FTDI chipset
- Works across Windows Mac Linux
- Longer cable provides flexibility
- Gold plating resists corrosion
- Supports up to 1Mbps transfer
Cons
- Must confirm male DB9 gender
- Driver download required initially
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The inclusion of a six foot cable offers more reach than many competing models allowing you to position your equipment comfortably. The gold plated connectors enhance durability and signal integrity while the wide compatibility list ensures it works with everything from old industrial controllers to modern laptops running Windows 11 or macOS.
One consideration is that the device features a male DB9 connector which may not suit setups requiring a female interface. Additionally initial setup involves downloading the official driver from the FT232 website before plug and play functionality is fully realized.
For professionals managing industrial systems or retro computing projects this adapter delivers the reliability needed for critical data transfers. It is an excellent investment if you prioritize signal stability and broad OS support in your D Sub to USB Adapter search.
Reliable FTDI Chipset Performance
The FTDI chipset minimizes connection errors and ensures stable communication with serial devices such as PLCs and barcode scanners during extended use.
Extended Cable Length Utility
A six foot cable provides extra reach which is particularly useful in server rooms or lab settings where devices are not located immediately adjacent to the computer.
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2. IOGEAR USB to PDA Serial Adapter – Strong Compatibility D Sub to USB Adapter
IOGEAR USB to PDA/Serial (DB9) Adapter w/ PC & Mac Drivers
USB 1.1 and 2.0 support
LED status light included
Remote wakeup capability
Three year limited warranty
The IOGEAR adapter is a solid option for users who need a reliable serial connection with minimal fuss. It boasts an excellent rating and includes necessary drivers for both PC and Mac users making it a convenient choice for mixed environments.
Pros
- High customer satisfaction rating
- Includes LED data indicator
- Provides remote wakeup support
- Comes with Mac and PC drivers
- Backed by three year warranty
Cons
- Shorter twelve inch cable
- Limited to USB 1.1 2.0
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Its LED status light allows you to monitor data transfer activity at a glance which is helpful for troubleshooting communication issues. The adapter supports remote wakeup and power management features ensuring it integrates smoothly with modern power saving settings on laptops.
While it functions well the twelve inch cable is relatively short which might restrict placement options in larger workspaces. Additionally it is limited to USB 1.1 and 2.0 standards which may not offer the highest speed available on newer ports.
If you need a trustworthy adapter for GPS units or handheld devices this model provides the reliability and warranty support to justify the investment. It remains a practical choice for users who value convenience and manufacturer support.
Visual Data Monitoring
The LED status light provides immediate visual feedback on data transfer activity helping users quickly identify active connections without software tools.
Warranty and Support
A three year limited warranty offers peace of mind and demonstrates the manufacturer confidence in the durability of this adapter over time.
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3. SABRENT USB 2.0 to Serial DB9 – Best Budget D Sub to USB Adapter
SABRENT USB 2.0 to Serial DB9 RS232 Male Adapter Cable
Prolific PL2303GS Chipset
All nine signals wired
Fixed hex standoffs
Electrically tested units
This SABRENT adapter delivers impressive value for users needing a straightforward connection to serial hardware without breaking the budget. It earns high marks for offering all necessary signals and a reliable chipset that supports a wide range of baud rates.
Pros
- Very affordable price point
- Includes all nine signals
- Fixed standoffs for stability
- Supports high baud rates
- Electrically tested before shipping
Cons
- Requires driver on older systems
- Male DB9 connector only
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The fixed hex standoffs are a thoughtful detail that ensures the connector mates securely with the female DB9 port preventing accidental disconnections. It supports Windows 11 and 10 automatically though older systems may need manual driver installation to function correctly.
While the performance is solid the male DB9 plug requires the host device to have a matching female port. It is important to verify your interface before purchasing to avoid compatibility issues with your specific equipment setup.
For hobbyists or professionals managing multiple legacy devices this adapter provides the essential functionality at a low cost. It is an ideal choice for anyone prioritizing cost effectiveness and signal completeness over premium features.
Secure Connection Design
Fixed hex standoffs on the male DB9 plug ensure a secure fit that reduces the risk of loose connections during active data transfers.
High Baud Rate Support
Supporting baud rates up to 460800 bps allows for efficient data throughput which is critical for responsive control of industrial or testing hardware.
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4. BENFEI USB to Serial Adapter – Durable Shielding D Sub to USB Adapter
BENFEI USB to Serial Adapter,6 Feet USB to RS-232 Male (9-pin) DB9 Serial Cable
Prolific PL-2303 Chipset
Triple shielding design
Six feet length provided
Eighteen month warranty
The BENFEI adapter focuses on durability and signal quality through its triple shielding and tinned copper conductors. This construction helps maintain clean data transfers in environments with potential electromagnetic interference making it a robust choice for daily use.
Pros
- Triple shielding reduces noise
- Tinned copper conductor used
- Wide OS support range
- Six foot flexible cable
- Extended warranty coverage
Cons
- Slightly lower rating
- Requires driver installation
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Its six foot cable provides ample reach for various setups while the Prolific chipset ensures compatibility with a broad spectrum of operating systems from Windows 7 to modern versions and various Linux distributions. The unconditional warranty adds further confidence to the purchase.
Although the rating is slightly lower than some competitors it still represents a solid performance option. Users may need to install drivers depending on their specific system version but the manufacturer provides clear documentation to assist with this process.
If you require an adapter that can withstand frequent plugging and unplugging in a workshop or office this model offers the build quality needed. It is a great fit for those who value physical durability and warranty protection.
Signal Integrity Protection
Triple shielding and tinned copper conductors work together to minimize electrical noise and ensure reliable data transmission between devices.
Extended Warranty Coverage
An unconditional eighteen month warranty offers long term satisfaction and protection against manufacturing defects for the adapter.
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5. StarTech.com USB to RS232 Cable – COM Port Retention D Sub to USB Adapter
StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable with COM Port Retention
COM Port Retention
Nonvolatile memory
Up to 920 kbps
TAA Compliant
StarTech is known for professional solutions and this adapter features COM Port Retention to keep port assignments consistent even after disconnection. This is particularly valuable in environments where software relies on specific port numbers for configuration and operation.
Pros
- Retains COM port values
- Professional grade solution
- Broad OS compatibility
- Ideal for industrial use
- Fast data transfer rates
Cons
- Short one foot cable
- Higher price point
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The adapter supports up to 920 kbps which offers fast serial communication speeds suitable for demanding tasks. It works seamlessly across Windows Linux and Mac OS making it versatile for diverse IT infrastructure setups that require legacy hardware integration.
The one foot cable limits movement but ensures the adapter remains close to the computer which can be useful in compact setups. While the price is higher than budget models the stability and retention features justify the cost for enterprise use.
For IT administrators and industrial users who need predictable port assignments this adapter is a standout choice. It ensures minimal disruption when equipment is moved or replaced in the workspace.
Port Assignment Consistency
COM Port Retention saves the assigned serial port value in memory so software does not need reconfiguration when the device is replugged.
Professional Grade Design
Built for industrial and professional settings this adapter ensures reliable connectivity that meets strict standards for enterprise hardware integration.
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6. TRIPP LITE Keyspan Adapter – Premium High-Speed D Sub to USB Adapter
TRIPP LITE Keyspan High-Speed USB to Serial Adapter
Up to 230 Kbps speed
LED status indicator
Three foot cable length
Plug and play design
The TRIPP LITE Keyspan adapter is designed for users who need premium performance and reliability from their serial connections. It offers high-speed data transfer that exceeds standard built-in serial ports and comes with a clear LED indicator to monitor activity.
Pros
- High speed data transfer
- LED activity indicator
- No external power needed
- Strong build quality
- Comprehensive warranty
Cons
- Premium pricing
- Shorter than some options
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Its three foot cable provides enough length for flexible placement while the device draws power directly from the USB port eliminating the need for extra power adapters. This plug and play convenience simplifies setup and reduces clutter on your desk.
While it is more expensive than budget options the build quality and performance justify the investment for critical applications. The three year warranty provides additional assurance that the product will remain functional through years of daily use.
If you prioritize speed and ease of use this adapter is an excellent choice for connecting GPS units or data loggers to your computer. It delivers a premium experience that matches the demands of modern users working with legacy hardware.
High Speed Communication
Supporting data transfer rates up to 230 Kbps ensures fast and responsive communication with your serial devices compared to older standards.
Visual Activity Monitoring
An LED indicator shows adapter status and data activity at a glance helping users confirm connections without checking software interfaces.
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7. StarTech 17in USB to Serial Cable – Portable IT Pro D Sub to USB Adapter
StarTech 17in 1-Port USB to Serial Adapter Cable, M/M
43cm cable length
921.6 Kbps max
512 Byte FIFO
Lightweight design
This StarTech adapter is built specifically for IT professionals who travel or work in multiple locations. Its compact lightweight design makes it easy to carry in a laptop bag while maintaining high performance standards for reliable serial communication.
Pros
- Compact and lightweight
- Fast baud rates
- Supports parity modes
- Ideal for professionals
- 3 year support
Cons
- Short cable length
- Limited physical space
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With a max baud rate of 921.6 Kbps it handles fast data transfers efficiently. The adapter supports various parity modes and data bit configurations ensuring compatibility with a wide range of industrial equipment and testing instruments.
The 43cm cable is short which keeps the adapter compact but may limit reach for some users. If you need a portable solution that fits well in a carrying case this model is designed to meet your mobility needs perfectly.
For technicians and field engineers who need to connect to PLCs or network switches on the go this adapter provides the necessary tools. Its strong warranty and technical assistance add value for professionals relying on dependable hardware.
Maximum Portability
The lightweight design and short cable ensure the adapter fits easily into carrying cases making it ideal for professionals working in multiple locations.
Professional Technical Support
Backed by 24/5 multi-lingual technical assistance and a 3 year warranty this product offers the support expected in professional IT environments.
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8. DTECH 10 Feet Adapter – Long Reach D Sub to USB Adapter
DTECH 10 Feet USB 2.0 to RS232 DB9 Serial Port Adapter Cable with FTDI Chipset
FTDI Chipset
10 feet length
Gold plated connector
Windows Mac Linux
The DTECH adapter stands out for its ten foot cable which offers significant reach for connecting devices that are far from the computer. This extra length is ideal for workshops or labs where equipment placement is fixed and flexible cabling is essential.
Pros
- Very long cable length
- Reliable FTDI chipset
- LED status light
- Durable gold plating
- Crystal clear design
Cons
- Bulky for travel
- Not for short distances
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Powered by the FTDI chipset it ensures reliable and stable performance across major operating systems. The gold plated connectors and active LED status light add to the durability and usability of the product in professional environments.
While the length is a major advantage it may be too long for compact desktop setups where cable management is a priority. However for situations requiring extended reach this adapter solves the distance problem effectively without signal loss.
If you need to connect to a router or printer located across the room this model is the right choice. It combines the reliability of the FTDI chipset with practical cable length for real world applications.
Extended Cable Length
A ten foot cable allows you to connect serial devices located far away from your computer without needing additional extension cables.
Reliable Chipset
The FT232 chip ensures stable communication and driver compatibility making it one of the most reliable options for serious users.
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9. UGREEN 6FT Adapter – Balanced Performance D Sub to USB Adapter
UGREEN 6FT DB9 Male 9 Pin USB to Serial Adapter, RS232 to USB Cable
256kbps transmission
PL2303 Chipset
Gold-plated connectors
PVC jacket
UGREEN offers a well balanced adapter that provides reliable connectivity for a wide range of users. It features a robust chipset and gold plated connectors that ensure signal stability and physical durability in daily use.
Pros
- Balanced feature set
- Flexible PVC jacket
- Gold plated durability
- Wide OS compatibility
- Driver free on Win8+
Cons
- Not driver free for older systems
- Standard length cable
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The six foot cable provides a good balance between reach and manageability. The flexible PVC jacket helps prevent tangling which keeps your workspace organized while protecting the internal wiring from daily wear and tear.
While it is driver free for Windows 8 and above older systems require installation of the appropriate drivers. This minor step is standard for most adapters and does not significantly impact the overall user experience.
For general users and small business owners needing a dependable serial connection this model offers excellent value. It is a solid choice for connecting cash registers or scanners to modern computers.
Tangle Free Design
A flexible PVC jacket prevents the cable from tangling and helps manage the cable length effectively in your workspace.
Driver Compatibility
Windows 8 and above users enjoy driver free installation while other systems may require a quick manual installation step.
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10. StarTech 3ft USB to Serial Cable – Secure Locking D Sub to USB Adapter
StarTech 3ft 1-Port USB to Serial Cable, Prolific
Secure screw lock nuts
DB9 DB25 support
3 foot length
Prolific Chipset
This StarTech adapter provides a secure locking mechanism using screw lock nuts that prevent accidental disconnections. This feature is particularly valuable for applications where the device may be moved or jostled during regular operation.
Pros
- Secure locking mechanism
- Supports DB25 and DB9
- Stable connection
- Reliable Prolific chipset
- 2 year warranty
Cons
- Standard cable length
- Not USB 3.0 optimized
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It supports both DB9 and DB25 connectors offering flexibility for different legacy serial standards. The three foot length is suitable for most desk setups while the Prolific chipset ensures broad compatibility across major operating systems.
The screw nuts add a layer of security but also mean the setup takes a moment longer to connect and disconnect. For static setups where stability is key this trade off is well worth the added reliability.
If you work in environments where connection security is vital such as labs or server rooms this adapter delivers the performance needed. It is a trusted option for professionals who prioritize connection integrity.
Secure Connection Nuts
Screw-lock nuts on the connector allow you to secure the cable to the device preventing accidental disconnection during use.
Dual Connector Support
Compatible with both DB9 and DB25 devices this adapter offers flexibility for different serial standards found in legacy equipment.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Choosing the right adapter requires understanding your specific hardware needs and compatibility requirements. This guide outlines the critical factors to consider before making a purchase.
Chipset Reliability
The chipset inside the adapter determines how stable your connection will be. High quality chipsets like FTDI or Prolific generally offer better driver support and fewer dropouts compared to generic alternatives. Always check the product specifications to ensure the chipset matches your needs for performance and reliability.
Prioritize adapters with well-known chipsets to avoid compatibility headaches and ensure smooth data transfer between devices.
Connector Gender and Pinout
D Sub connectors come in male and female varieties. Confirm whether your device has a male or female DB9 port before purchasing. Some adapters support both DB9 and DB25 formats but most are limited to one gender. Mismatching gender can render the adapter unusable for your specific application.
Verify the gender and pinout configuration of your target device to ensure the adapter fits correctly.
Cable Length
Cable length impacts how you can position your equipment. Shorter cables are better for desktop setups while longer cables provide flexibility in labs or industrial environments. A six foot cable is a common standard but ten foot options are available for extended reach requirements.
Select a length that allows comfortable placement without excessive cable slack or tension.
Operating System Compatibility
Ensure the adapter supports your operating system. Windows 10 and 11 often have built-in drivers but macOS and Linux may require manual installation. Check the product description to verify driver availability and support for your specific OS version.
Choose an adapter with clear OS compatibility documentation to avoid installation issues.
Baud Rate Support
Baud rate determines how fast data is transferred. Most modern adapters support rates up to 460800 bps or higher. If your application requires high speed data collection ensure the adapter supports the necessary throughput to avoid bottlenecks.
Match the adapter speed to your device requirements for optimal performance.
Build Quality and Shielding
Durability is key for adapters used in frequent plug and play scenarios. Look for gold plated connectors and shielding against interference to protect data integrity. PVC or rubber jackets add physical protection against wear and tear.
Choose a model with robust physical design for longer lifespan.
Warranty and Support
A solid warranty indicates the manufacturer stands behind their product. Many professional grade adapters offer three year warranties which provide long term peace of mind. Good customer support can also help resolve driver or compatibility issues quickly.
Prefer brands with strong warranty terms and accessible technical support.
Power Requirements
Most USB to serial adapters are bus powered and do not require an external power source. Confirm this feature to avoid additional adapters or cords. This is generally standard but it is always good to verify for specific industrial use cases.
Ensure the adapter is bus powered to simplify your setup.
How to Use and Care for Your D Sub to USB Adapter
Connect the USB end of the adapter to an available USB port on your computer. Ensure the port is functioning properly by checking the LED if present.
Install the necessary drivers for your operating system before connecting the serial device. Download drivers from the official manufacturer site to avoid errors.
Plug the serial device into the DB9 port and tighten the screw lock nuts if available. Verify the COM port settings in your software match the adapter's assigned port number.
Frequently Asked Questions
What is a D Sub to USB Adapter used for?
A D Sub to USB Adapter allows you to connect legacy serial devices to modern computers that lack native serial ports. Common uses include connecting to PLCs, barcode scanners, routers, and industrial equipment that communicate via RS232.
Are these adapters plug and play?
Most adapters require driver installation on older systems but may be automatic on Windows 8 or higher. Always check the product specs for specific OS requirements and be prepared to install drivers manually if needed.
Can I use this for video output?
No. D Sub to USB adapters are designed for serial data communication only and cannot transmit video signals like HDMI or VGA. Using it for monitors will not work and may damage your setup.
Does the length of the cable matter?
Cable length affects signal stability and physical reach. Longer cables can introduce more resistance and signal degradation but are often shielded to mitigate this. Choose a length that fits your workspace without excess slack.
What if my adapter doesn't work?
First verify the cable is securely connected at both ends and the correct driver is installed. Check the COM port assignment in Device Manager and ensure the settings match your application requirements.
Will this work with Mac systems?
Many adapters support macOS but may require downloading specific drivers. Ensure the product description mentions Mac compatibility and verify driver availability for your macOS version before purchasing.
Final Thoughts on Choosing the Best D Sub to USB Adapter
Selecting the best D Sub to USB Adapter depends on balancing reliability with specific requirements like cable length and chipset quality. Our top picks offer a range of options from budget friendly to high performance choices.
Prioritize adapters with proven chipsets and robust warranties to ensure long term reliability. Matching the connector gender and baud rate to your device needs is crucial for seamless integration.
Remember that prices and availability change frequently so check current listings before making your final decision. Investing in the right adapter ensures your legacy hardware remains functional and efficient in modern environments.