Best Port Serial Adapters of 2026

Name: StarTech.com USB to Serial RS232 Adapter
Brand: StarTech

Mike Davis

Last Updated: Jan 13, 2026

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Port Serial Adapters are essential devices for connecting serial devices to a computer or laptop. They come in various types, such as USB to RS232, RS485, or RS422 adapters. These adapters are easy to use, and they allow users to connect legacy serial devices to modern computers that no longer have serial ports. They are commonly used in industrial automation, manufacturing, and healthcare industries. With Port Serial Adapters, users can avoid the cost of replacing legacy serial devices and enjoy seamless connectivity to their computers.

At a Glance: Our Top Picks

#TOP 1

StarTech.com USB to Serial RS232 Adapter

9.9

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#TOP 2

JSAUX 4K DisplayPort to HDMI Adapter 2-Pack

9.8

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#TOP 3

Tripp Lite USB to Serial Adapter

9.6

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Top 10 Port Serial Adapters

#TOP 1 Best USB Serial Adapter

StarTech.com USB to Serial RS232 Adapter

StarTech
ICUSB232V2
Gray
1.3ft | nuts

StarTech.com 17in (43cm) 1-Port USB to Serial Adapter Cable, USB-A to DB9 RS232 Adapter, Prolific Chipset - M/M

The StarTech.com USB to Serial RS232 Adapter is a portable and versatile device that allows you to connect, monitor, and control a serial device through USB. It features broad compatibility with USB 1.0 or 2.0 ports and works with Windows, Mac, or Linux systems. The adapter also supports fast transfer speeds up to 921.6Kbps and is USB-powered, requiring no additional power adapter. Its lightweight design makes it ideal for professionals on the go.

9.9

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What We Like

Plug and play setup
Broad OS compatibility
Reliable RS-232 to USB connection
Works without extra drivers
Correct prolific chipset

#TOP 2

JSAUX 4K DisplayPort to HDMI Adapter 2-Pack

JSAUX
Mini PC
Grey
2Pack

JSAUX 4K DisplayPort to HDMI Adapter 2-Pack, DP PC to HDMI Monitor Converter Video UHD 2K@120Hz,4K@30 DP to HDTV Male to Female Uni-Directional Adapter Compatible with Dell, Lenovo, HP,GPU, AMD -Grey

Features

[Plug & Play] : No Driver Or Software Required, No More Fear For Unstable WiFi, No Time Wasted.[Note: The DP To HDMI Adapter No Longer Works With Active Accessories (docking Stations, Adapters, Hubs) And Cables With Embedded Chips, Like USB-C To HDMI Or HDMI To VGA.]
[4K Ultra High Definition] : DisplayPort To HDMI Adapter Can Supports Max 4K@30Hz Resolution, (Backward Supports 2K@60Hz, 1080P@120Hz), Provides Life Like And Fluent Frames To Your Large Display Screen, Giving You A Realistic 3D Screen Experience. Please Note: HDMI Cable Not Included. DON'T Support HDMI To DP. It Is NOT Bi-Directional
[Universal Compatibility] : This DisplayPort To HDMI Converter Is Compatible With Laptops (HP ProBook EliteBook, Lenovo ThinkPad), Desktop Tower (HP, Dell, Lenovo), GPU (AMD, NVIDIA), And Other Devices With A DisplayPort. Connect To TV, Projector, Monitor, VR Headset, Etc

9.8

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#TOP 3

Tripp Lite USB to Serial Adapter

TRIPP LITE
USA-19HS
Black
1-Pack

Tripp Lite Keyspan High-Speed USB to Serial Adapter, PC & Mac, USB-A to DB9 RS232 Male, 3 Foot / 0.91 Meter Cable, 3-Year Warranty (USA-19HS)

The Tripp Lite Keyspan High-Speed USB to Serial Adapter connects a serial device to a USB computer with plug-and-play convenience. It draws power directly from your computer and supports data transfer rates up to 230 Kbps, twice the speed of a standard built-in serial port. The DB9 serial port is seen as a COM port by your computer, and is available for use by any program that accesses COM ports. Additionally, an LED shows adapter status and data activity at a glance.

9.6

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What We Like

Stable and reliable connection
Excellent compatibility (Windows, Mac)
Easy setup and installation
Comprehensive documentation and support
Consistent COM port assignment

#TOP 4

StarTech.com USB to Serial RS232 Adapter

StarTech
ICUSB232FTN
Black
5.6ft

StarTech.com 6ft (1.8m) 1-Port USB to Serial RS232 Adapter, FTDI DB9 Serial DCE Adapter Cable, Null Modem, USB 2.0 - TAA

The StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI - Null Modem - USB 1.1 / 2.0 - Bus-Powered (ICUSB232FTN) offers maximized portability and compatibility with your Windows, Mac, or Linux systems. It features a single cable design that eliminates the need for additional adapters and cables. This serial adapter can convert your available USB port into a null modem RS232 DB9 serial port, which resolves any DTE/DCE conflicts. It also supports fast transfer speeds of up to 921.6Kbps.

9.6

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What We Like

FTDI chipset reliability
Plug and play setup
LED status indicators
Cross-platform compatibility
Null modem functionality

#TOP 5 Best Male-Male Serial Adapter

OIKWAN USB to RS232 Adapter

OIKWAN
AQ-17

OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)…

The OIKWAN USB to RS232 Adapter with FTDI Chipset is a high-quality, reliable and convenient solution for connecting serial devices to your Windows, MAC or Linux system. The latest FTDI chipset ensures fast and stable operation, while the gold-plated USB RS232 connector and PVC cable provide excellent performance and durability. With plug-and-play installation, this USB-powered adapter cable supports a transfer rate of up to 1Mbps and can be used with a wide range of devices, including modems, scanners, printers and more.

9.5

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What We Like

Easy driver installation
Works with Windows 10/11
High build quality
Reliable connectivity
Good value for money

#TOP 6

DTech USB to RS422 RS485 Serial Port Converter Adapter Cable

DTECH
DT-5119
Black
1.5ft

DTECH USB to RS422 RS485 Serial Port Converter Adapter Cable with FTDI Chip Supports Windows 11 10 8 7 XP Mac -1.5 Feet

Introducing the DTech USB to RS422 RS485 Converter - a high-quality adapter cable that allows you to easily connect RS485 or RS422 devices to your laptop or PC computer via USB. With built-in LED Troubleshooting Indicators, this converter ensures a seamless and hassle-free connection. It is ideal for industrial environments, providing surge protection and ESD isolated protection on signal pins to safeguard your control equipment against electrical damage. Equipped with a reliable FTDI chipset (FT232) and I/O auto conversion circuitry, this converter guarantees high performance and stability. Compatible with Windows 11, 10, 8, 7, XP, and Mac, this plug-and-play converter requires no power supply. Say goodbye to IRQ and COM port conflicts, as this converter eliminates the need for additional system resources. Enjoy half duplex communication with RS485 and full duplex communication with RS422. Upgrade your connectivity with the DTech USB to RS422 RS485 Converter.

9.5

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What We Like

Easy connectivity
Industrial-grade protection
Reliable FTDI chipset

#TOP 7 Best Male Serial Adapter

DB9 Null Modem Male to Female Slimline Adapter 2 Pack

Arnorin
KAD9D90001-S-2
2 Pack
Standard 2 Pack

DB9 null modem male to female slimline data transfer serial port adapter 2 Pack

The DB9 Null Modem Male to Female Slimline Adapter 2 Pack converts standard straight wired cables to null modem wiring with pin 9 open. Its slimline design reduces leverage strain on computer ports, while the UL grade 94V-0 connector insulator satisfies flammability requirements. Additionally, the screws are removable and reversible for easy installation and flexibility.

9.3

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What We Like

Easy screw removal
Well-made construction
Fixes null modem issues
Fast shipping
Useful for various setups

#TOP 8

StarTech.com USB to RS232 Serial DB9 Adapter Cable

StarTech
ICUSB232PRO
Black
1ft | nuts

StarTech.com 1 ft. USB to RS232 Serial DB9 Adapter Cable with COM Port Retention - Up to 920 kpbs USB A to DB9 Serial Adapter , TAA (ICUSB232PRO)

The StarTech.com USB to RS232 Serial DB9 Adapter Cable is a professional-grade solution that offers broad compatibility for connecting legacy or industrial RS232 serial devices to a laptop or desktop computer through USB. The adapter retains assigned serial COM port values in nonvolatile memory to automatically be assigned to the adapter serial port if disconnected and reconnected. With versatile functionality, this USB serial adapter is used to connect, monitor, and control industrial sensors and equipment, as well as control LED and digital signage boards.

9.3

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What We Like

Broad compatibility for connecting legacy or industrial RS232 serial devices to a laptop or desktop computer through USB.
Retains assigned serial COM port values in nonvolatile memory to automatically be assigned to the adapter serial port if disconnected and reconnected.
Versatile functionality for connecting, monitoring, and controlling industrial sensors and equipment, as well as controlling LED and digital signage boards.

#TOP 9

ANMBEST 10PCS DB9 Female Breakout Connector,DB9 Solderless RS232 D-SUB Serial to 9-pin Port Terminal Adapter Connector Breakout Board

ANMBEST
Anmbest_MD151MAIN
black

ANMBEST 10PCS DB9 Female Breakout Connector,DB9 Solderless RS232 D-SUB Serial to 9-pin Port Terminal Adapter Connector Breakout Board with Case Long Bolts Tail Pipe

Features

EASY TO USE: No Welding Required, 128 Type Environmental Protection Copper Terminal Design, No Need For Soldering Iron And Cumbersome Tools, Easy Wiring. The Housing Is Designed With A Folding Buckle For Easy Assembly And Disassembly Without Tools.
HIGH QUALITY&DURABLE: Pure Copper Plated Joints, Fine Solder Joints, Resistance To Plug, And Good Contact To Ensure High-Quality, Durability And A Long Life. The Outer Casing Is Made Of Environmentally Friendly PP Engineering Material, Which Is Soft And Durable.
INTUITIVE: All Signal Ports Are Clearly Named And Labeled On Both Sides Of The Board For Quick Wiring.

9.3

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#TOP 10

StarTech.com 4 Port USB to Serial RS232 Adapter

StarTech
ICUSB2324I
Black
4 Port

StarTech 4 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub, TAA (ICUSB2324I)

The StarTech.com USB to Serial RS232 Adapter is a rugged and durable device, designed for industrial settings. It has four ports and an all-metal enclosure. The adapter features COM retention capabilities to maintain COM port assignments when rebooting. It is easy to install and use, with no external power adapter required. The adapter comes with integrated wall mount brackets and DIN Rail clips, providing versatile mounting options.

9.2

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What We Like

Rugged all-metal enclosure for added durability in industrial settings
COM retention capabilities to maintain COM port assignments during reboots
Easy plug and play installation, powered by an available USB port/cable
Integrated wall mount brackets and DIN Rail clips for versatile mounting options

Frequently Asked Questions (FAQs)

1. What are serial adapters?

If you do not have a serial connection port on your computer, you'll need to have a USB to serial adapter. This will convert the serial signal you are connected to into a digital signal that your computer will read through the USB cable it is connected to, also known as the host.

2. What is a USB to serial port adapter?

A USB to serial adapter, also referred to as a USB serial converter or RS232 adapter is a small electronic device which can convert a USB signal to serial RS232 data signals. RS232 is the type of signal which is in many older PCs and is referred to as a serial COM port.

3. Can a serial port be converted to USB?

Many older peripherals use serial plugs, but you can adapt them to USB ports with a converter plug. To connect a monitor, printer, or other device with a serial plug to a computer lacking serial ports, you need to buy a serial-to-USB converter plug or cord. These are widely available online or at electronics stores.

4. Is serial port outdated?

The serial port used to be found on almost all new PC's but not anymore. Thus as of 2008, it's becoming obsolete, if not already obsolete. It's often called a "legacy" device, but it's still used by some for hardware designed to connect to the serial port especially for computers used as servers by companies.

Editor's Notes

During our port serial adapter research, we found 24 port serial adapter products and shortlisted 10 quality products. We collected and analyzed 53,214 customer reviews through our big data system to write the port serial adapters list. We found that most customers choose port serial adapters with an average price of $17.85.

The port serial adapters are available for purchase. We have researched hundreds of brands and picked the top brands of port serial adapters, including StarTech, JSAUX, TRIPP LITE, OIKWAN, DTECH. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.

Written by

Mike Davis

Mike Davis is a professionally trained electrician with six years of working experience in the electronics industry. He has written an array of web and mobile-based articles for e-magazines and blogs. He loves trying out some novel and popular gadgets and his expertise is in the areas of electronics and computers which is built over many years of working and personal experiences.