SABRENT USB 2.0 to Serial DB9
4.4Editor score
Prolific chipset support
Fixed hex standoffs included
Bus powered design
In this guide
Connecting legacy serial devices to modern computers often requires a reliable D Sub to USB Adapter. These converters bridge the gap between older RS232 hardware and contemporary USB ports, ensuring your essential tools remain functional without needing outdated systems.
We evaluated ten top-rated adapters based on chipset quality, compatibility, build durability, and user feedback. Each product was scrutinized for data transfer rates, driver support across operating systems, and physical design to help you find the right fit for your specific hardware needs.
Every pick highlights key strengths and potential limitations to guide your decision. While prices fluctuate over time, the performance characteristics and compatibility details remain consistent. Always verify your device port gender before purchasing to ensure a seamless connection experience.
Top 3 Picks for Best D Sub to USB Adapter
USB to RS232 USB Serial Adapter
4.6Editor score
FTDI chipset ensures reliability
Wide OS compatibility support
Gold plated connectors included
TRIPP LITE Keyspan High-Speed
4.6Editor score
230 Kbps data rate
LED status indicator
Three year warranty
Top 10 Best D Sub to USB Adapter in 2026 Compared
This side-by-side comparison highlights the core specifications and unique attributes of each adapter to help you make an informed choice based on your specific technical requirements and budget constraints.
ProductsSpecificationsEditor scorePrice
Editor's Choice
USB to RS232 Adapter
FTDI Chipset
1Mbps Transfer Rate
Windows Linux Mac OS
6ft Cable Length
4.6Editor score
Editor's Choice
IOGEAR GUC232A
USB 1.1 2.0
LED Status Light
96 Byte Buffer
12 Inch Cable
4.7Editor score
Best Budget
SABRENT CB-DB9P
Prolific Chipset
Fixed Hex Standoffs
460800 Baud Rate
1 Year Warranty
4.4Editor score
BENFEI USB to Serial
Prolific Chipset
Triple Shielding
18 Month Warranty
6ft Cable Length
4.2Editor score
StarTech ICUSB232PRO
COM Port Retention
920 Kbps Speed
TAA Compliant
1ft Cable Length
4.5Editor score
TRIPP LITE USA-19HS
230 Kbps Speed
LED Status Indicator
3 Year Warranty
3ft Cable Length
4.6Editor score
StarTech ICUSB232V2
921.6 Kbps Speed
512 Byte FIFO
3 Year Warranty
17 Inch Cable
4.6Editor score
DTECH 10 Feet Cable
FTDI Chipset
LED Indicator Light
Gold Plated Connectors
10ft Cable Length
4.6Editor score
UGREEN DB9 Male Adapter
256 Kbps Speed
PL2303 Chip
Gold Plated Connectors
6ft Cable Length
4.6Editor score
StarTech ICUSB232DB25
230.4 Kbps Speed
DB25 Compatibility
2 Year Warranty
3ft Cable Length
4.5Editor score
1. USB to RS232 Adapter – Best Overall D Sub to USB Adapter
USB to RS232 Adapter
FTDI Chipset
1Mbps Transfer Rate
Plug and Play
Windows Mac Linux
This USB to RS232 adapter stands out for its consistent performance across multiple operating systems. Rated highly by users, it effectively connects legacy serial devices to modern USB ports without signal loss. The FTDI chipset ensures stable data transmission critical for industrial and networking tasks.
Pros
- Reliable FTDI chipset
- Wide OS compatibility
- Gold plated connectors
- Flexible six foot cable
Cons
- Driver install required on older systems
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Its six foot cable provides ample reach for workstation setups. Gold plated connectors protect against corrosion ensuring longevity. Users appreciate the clear distinction between serial and video adapters avoiding common confusion. The compact design fits easily into toolkits for fieldwork.
While it requires driver installation on some legacy systems this step ensures full functionality. The lack of external power needs simplifies deployment. It is an excellent choice for IT professionals needing reliable connectivity for PLCs or barcode scanners.
Anyone working with RS232 devices will find this adapter indispensable. Its balance of quality and accessibility makes it a top recommendation for daily use in varied environments.
Chipset Reliability
The FTDI chipset offers superior stability compared to generic alternatives ensuring consistent data flow during critical operations.
Connector Durability
Gold plated ports resist oxidation maintaining strong contact even after years of frequent plugging and unplugging.
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2. IOGEAR GUC232A – Best Legacy Support D Sub to USB Adapter
IOGEAR GUC232A
USB 1.1 2.0
LED Status Light
96 Byte Buffer
Power Management
The IOGEAR GUC232A adapter is a robust choice for connecting older serial devices to modern computers. It supports both USB 1.1 and 2.0 standards ensuring broad hardware compatibility. Users highlight its reliability for GPS units and other legacy peripherals.
Pros
- USB 1.1 2.0 compatible
- Clear LED status indicator
- Remote wakeup support
- Strong Mac compatibility
Cons
- Shorter cable length
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An LED status light provides immediate visual feedback on data transfers. This feature is particularly useful for troubleshooting connection issues quickly. The adapter also supports remote wakeup functions enhancing power management efficiency on laptops.
While the cable is relatively short at twelve inches it remains sufficient for desktop use. The included drivers work well across Windows and Mac systems. It is a solid option for those needing a simple reliable interface.
Tech enthusiasts working with PDAs or specialized GPS units will appreciate its functionality. Its compact form factor makes it ideal for portable toolkits where space is limited.
Visual Feedback
The LED status light helps users confirm active data transmission without relying on software indicators.
Power Efficiency
Support for remote wakeup and power management optimizes energy use for portable computing scenarios.
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3. SABRENT CB-DB9P – Best Value D Sub to USB Adapter
SABRENT CB-DB9P
Prolific Chipset
Fixed Hex Standoffs
Bus Powered
All 9 Signals
The SABRENT CB-DB9P adapter offers excellent value for those needing basic serial connectivity. It features a Prolific chipset and supports high baud rates for faster data transfer. The design includes fixed hex standoffs to secure connections firmly.
Pros
- Affordable price point
- Fixed standoffs included
- All signals wired
- Linux Mac support
Cons
- Baud rates vary by system
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All nine signals are wired ensuring full compatibility with devices requiring complete pinouts. It draws power directly from the USB port eliminating the need for external adapters. Users appreciate the straightforward plug and play experience on modern systems.
Drivers are often automatic on Windows 11 but manual installation may be needed elsewhere. The compact design fits well in carry bags for mobile technicians. It is a practical solution for budget conscious buyers.
Anyone configuring routers or POS terminals will find this adapter dependable. Its focus on essential features keeps costs low without sacrificing core performance.
Full Signal Support
All nine pins are actively wired to ensure compatibility with devices requiring complete control signals.
Secure Connection
Fixed hex standoffs prevent accidental disconnection during active data transmission sessions.
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4. BENFEI USB to Serial – Best Cable Length D Sub to USB Adapter
BENFEI USB to Serial
Prolific Chipset
Triple Shielding
18 Month Warranty
Tinned Copper
The BENFEI adapter is designed for users who need extra reach. Its six foot cable allows flexible placement of devices away from the computer. The Prolific chipset provides stable performance across Windows and Mac platforms.
Pros
- Six foot cable included
- Triple shielding design
- Clear VGA distinction
- Tinned copper conductor
Cons
- Slightly lower user rating
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Triple shielding reduces interference ensuring clean data transmission even in electrically noisy environments. Tinned copper conductors enhance durability and signal integrity. The packaging clearly distinguishes it from video adapters preventing confusion.
Customer support is responsive with an eighteen month warranty. Installation is straightforward with standard driver setup. It is an ideal choice for industrial setups requiring distance between host and peripheral.
Field technicians benefit from the extended cable length and rugged build. The focus on signal protection makes it reliable for long term use in varied conditions.
Signal Integrity
Triple shielding layers protect data packets from external electrical interference during transfer.
Extended Reach
The six foot length accommodates equipment placed further away from the main computing unit.
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5. StarTech ICUSB232PRO – Best Professional D Sub to USB Adapter
StarTech ICUSB232PRO
COM Port Retention
920 Kbps Speed
TAA Compliant
Broad OS Support
StarTechs ICUSB232PRO delivers professional grade reliability for industrial settings. It retains assigned COM port values in nonvolatile memory ensuring consistent device identification. This feature prevents application errors during repeated connections.
Pros
- COM port retention feature
- High data transfer speed
- TAA compliant
- Professional grade build
Cons
- Short one foot cable
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With speeds up to 920 kbps it handles demanding tasks efficiently. The adapter is TAA compliant making it suitable for government procurement projects. It works seamlessly across Windows Linux and Mac OS environments.
The compact design integrates easily into server racks or tight spaces. While the cable is short it is often sufficient for internal panel setups. Its robust construction supports frequent use in heavy duty workflows.
System administrators will value the stability and compliance features. It is a top choice for mission critical environments where consistent device recognition is paramount.
Device Consistency
COM port retention ensures the operating system recognizes the adapter on the same port every time.
Compliance Ready
TAA compliance meets strict sourcing requirements for government and enterprise procurement.
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6. TRIPP LITE USA-19HS – Best Warranty D Sub to USB Adapter
TRIPP LITE USA-19HS
230 Kbps Speed
LED Status Indicator
Plug and Play
3 Year Warranty
The TRIPP LITE Keyspan adapter is known for exceptional build quality and support. It offers transfer rates up to 230 Kbps doubling standard serial port speeds. An LED indicator provides clear visibility of data activity at a glance.
Pros
- Three year warranty
- LED activity indicator
- High data rates
- Strong brand reputation
Cons
- Higher cost than budget options
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Users benefit from a generous three year warranty reflecting manufacturer confidence. The design draws power directly from the USB port simplifying setup. Compatibility extends to both PC and Mac systems with included drivers.
While priced higher than budget models the reliability justifies the investment. It is ideal for environments where equipment failure is not an option. The cable length is suitable for desktop workstations.
IT managers seeking long term dependable solutions will appreciate this model. Its combination of speed and protection makes it a safe choice for critical infrastructure.
Warranty Protection
A three year warranty provides extensive coverage against defects and performance issues.
Visual Monitoring
LED indicators show connection status helping users quickly diagnose issues without tools.
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7. StarTech ICUSB232V2 – Best IT Pro D Sub to USB Adapter
StarTech ICUSB232V2
43cm Cable Length
512 Byte FIFO
Prolific Chipset
3 Year Warranty
Designed for IT professionals the StarTech ICUSB232V2 combines portability with power. Its forty three centimeter length fits easily into carrying cases for field service. The Prolific chipset supports baud rates up to 921.6 Kbps for fast operations.
Pros
- Portable lightweight design
- High FIFO buffer size
- Multi-lingual support
- Broad OS compatibility
Cons
- Medium cable length
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A 512 byte FIFO buffer minimizes data loss during high volume transfers. Compatibility spans Windows macOS and Linux with flexible parity and data bit settings. The unit comes with lifetime technical assistance for complex setups.
Its lightweight build ensures it adds minimal bulk to equipment kits. The warranty covers extensive usage scenarios reflecting robust quality control. It serves well for diverse industrial and logistics applications.
Professionals traveling between sites will find this adapter convenient. The balance of speed and portability makes it a reliable tool for network maintenance tasks.
Technical Support
Free lifetime technical assistance ensures expert help is available for challenging configurations.
Data Buffering
The large FIFO buffer prevents bottlenecks during rapid serial data exchange.
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8. DTECH 10 Feet Cable – Best Long Reach D Sub to USB Adapter
DTECH 10 Feet Cable
FTDI Chipset
10ft Cable Length
Gold Plated Connector
LED Indicator
The DTECH adapter offers exceptional reach for hard to access devices. Its ten foot cable bridges significant distances between computers and peripherals. The FTDI chipset ensures stable communication even over long wire lengths.
Pros
- Ten foot cable reach
- FTDI reliability
- LED status light
- Gold plated connectors
Cons
- Cable may be bulky
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Gold plated connectors resist corrosion maintaining signal integrity. An LED indicator provides visual confirmation of active connections. Users appreciate the clear differentiation from video adapters to avoid setup errors.
The cable features strong injection molding for durability against wear and tear. While long it manages well with standard cable ties. It is ideal for large workbenches or industrial machinery setups.
Anyone needing flexibility in device placement will benefit from this length. Its reliable chipset ensures consistent performance despite the extended signal path.
Extended Distance
The ten foot length allows flexible placement of remote serial devices across large rooms.
Signal Quality
High quality materials maintain signal stability even over long wire distances.
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9. UGREEN DB9 Male Adapter – Best Compact D Sub to USB Adapter
UGREEN DB9 Male Adapter
256 Kbps Speed
PL2303 Chip
Gold Plated Connectors
PVC Jacket
UGREENs adapter combines ease of use with solid performance. The flexible PVC jacket resists tangling keeping cables organized. It works with Windows 11 and higher without requiring additional drivers simplifying setup.
Pros
- Flexible PVC jacket
- Tangle free design
- Stable signal transfer
- Driver free on Win8+
Cons
- Lower max speed
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Gold plated connectors ensure durable connections over time. The PL2303 chip provides stable transmission rates up to 256kbps. Multiple shielding layers protect data from loss during transfer.
Its six foot length balances reach with portability for most tasks. Users find it lightweight and easy to store in small bags. It suits general office or light industrial usage well.
General users needing a simple reliable link will find this adapter effective. Its focus on usability makes it a practical choice for non technical environments.
Cable Management
Flexible materials prevent tangling and simplify cable organization in busy workspaces.
Ease of Setup
Driver free support on modern systems reduces installation time and complexity.
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10. StarTech ICUSB232DB25 – Best DB25 D Sub to USB Adapter
StarTech ICUSB232DB25
DB25 Compatibility
230.4 Kbps Speed
Locking Nut Support
3 Year Warranty
This StarTech adapter stands out for its DB25 compatibility alongside DB9 support. It includes secure locking nuts to prevent accidental disconnections. The Prolific chipset ensures reliable connections for various legacy hardware.
Pros
- Supports DB25 ports
- Secure locking nuts
- High FIFO buffer
- Flexible parity options
Cons
- Specific DB25 requirement
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Features like 512 byte FIFO and flexible parity options cater to specialized industrial needs. It works on Windows macOS and Linux with extensive configuration options. The three year warranty offers long term peace of mind.
Users in logistics or AV installations find it versatile for diverse setups. The three foot cable is suitable for standard equipment racks. It is a robust tool for complex environments.
Professionals requiring DB25 interfaces will appreciate this model's versatility. Its detailed feature set makes it a strong candidate for specialized connectivity tasks.
Port Versatility
Support for both DB9 and DB25 connectors expands compatibility options for legacy equipment.
Connection Security
Screw-lock nuts provide a secure mechanical connection to prevent accidental drops.
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Buying Guide – How to Choose the Best D Sub to USB Adapter
Selecting the right adapter requires attention to chipset compatibility, cable length, and specific port requirements to ensure seamless integration with your existing hardware.
Chipset Type
The chipset determines stability and driver support. FTDI chipsets are generally preferred for their reliability across different systems, while Prolific offers strong compatibility at a lower cost. Always verify the chipset matches your operating system requirements.
Choose FTDI for maximum reliability or Prolific for cost effective performance.
Port Gender
Confirm whether your device has a male or female DB9 port. Most adapters are male to female, but checking the interface beforehand prevents purchasing errors. Misidentifying gender is a common reason for returns.
Always inspect your device port before ordering to ensure physical compatibility.
Cable Length
Cable length affects where you can place your peripheral relative to the computer. Options range from 1 foot to 10 feet depending on workspace layout. Consider where your USB ports are located before buying.
Select a length that provides reach without creating cable clutter or signal issues.
Data Transfer Rate
Different applications require different speeds. Standard serial tasks might work with 115kbps, but industrial systems may need 921kbps. Check your device specifications to ensure the adapter supports the required baud rate.
Match the adapter speed to your device requirements for consistent performance.
Operating System Support
While many adapters work out of the box on Windows 11, others need manual driver installation. macOS and Linux users should verify specific support before purchasing. Driver availability ensures seamless integration without technical headaches.
Verify OS compatibility to avoid installation hurdles on your specific system.
Shielding and Build
Industrial environments often require extra shielding to prevent signal interference. Look for triple shielding or tinned copper conductors for durability. Robust connectors resist physical wear and corrosion over time.
Prioritize shielding if you use the adapter in electrically noisy environments.
Warranty and Support
A longer warranty indicates manufacturer confidence in product quality. Brands often provide technical support for complex driver issues. Check return policies to ensure you can exchange the adapter if it does not fit your needs.
Look for at least a two year warranty to protect your investment.
Video vs Serial
Ensure you are buying a serial adapter and not a video adapter. Many products look similar but serve entirely different functions. Read the product description carefully to confirm it is for RS232 serial data.
Double-check the product title and details to avoid confusing serial with video adapters.
How to Use and Care for Your D Sub to USB Adapter
First, install the necessary drivers from the manufacturer's website if they are not automatically detected. On older systems, you might need to reboot after installation to ensure proper COM port assignment.
Next, connect the USB end to your computer and the DB9 end to your device. Ensure the connector is fully seated and secure any locking screws if available. Check the LED indicator to confirm data activity.
Finally, keep the adapter clean and free of dust. Avoid bending the cable excessively to prevent internal wire damage. Store it in a protective case when not in use to maintain connector quality.
Frequently Asked Questions
Is a D Sub to USB Adapter the same as a VGA adapter?
No, they are completely different. A D Sub to USB Adapter connects serial data devices like PLCs or modems, while a VGA adapter transmits video signals. Always verify the connector type before purchasing to avoid confusion.
Do I need external power for these adapters?
Most modern adapters are bus powered, meaning they draw electricity directly from the USB port. This eliminates the need for separate power supplies. However, some high load industrial setups may require external power for stability.
Will this work with Linux systems?
Yes, many adapters support Linux with appropriate drivers. Some work out of the box on newer distributions, but you might need to install specific kernel modules. Always check manufacturer documentation for Linux compatibility details.
How do I know which COM port is assigned?
On Windows, you can check the assigned COM port in Device Manager under Ports (COM & LPT). This number is crucial for configuring your software applications. You can often change this in the adapter settings if needed.
What is the maximum data speed?
Speed varies by chipset, typically ranging from 115kbps to 921kbps. Industrial devices usually require higher rates for efficient operation. Confirm your device's specifications to ensure the adapter can handle the required throughput.
Can I use this for printers?
Some older printers use serial ports, so yes, these adapters work for legacy printing. However, modern printers typically use USB or network connections. Verify your printer's port type before attempting to connect.
Why does my adapter not work after installation?
Common issues include wrong port gender, missing drivers, or incorrect baud rate settings. Verify the physical connection and check Device Manager for error codes. Ensure your software settings match the adapter's configuration.
Are there different cable lengths available?
Yes, adapters come in lengths ranging from 1 foot to 10 feet. Choose a length that suits your workspace layout to prevent signal degradation. Longer cables may require higher quality shielding for reliability.
Final Thoughts on Choosing the Best D Sub to USB Adapter
We highlighted ten reliable adapters ranging from budget friendly options to professional grade solutions. The FTDI and Prolific models offer strong performance for industrial and networking tasks with stable connections.
Prioritize chipset reliability and port gender compatibility to avoid common setup issues. Longer cables and extra shielding are valuable for complex industrial environments.
Always check current prices and stock before purchasing as these change frequently. With the right adapter, your legacy hardware remains functional and compatible with modern computing needs.