Best Serial Adapters In September 2026

Here you have our curated list of Best Serial Adapters. Each of them comes with different price, style, and design, so you have plenty of options to choose from. Keep reading for our top products review!

To help you in your search, we have completed this list of the Best Serial Adapters.

Top Rated Best Serial Adapters Of 2026

Rank	Product Name	Score
1	DB9 null modem male to female slimline data transfer serial port adapter 2 Buy Now	9.7 Buy Now
2	Cable Matters USB C to Serial Adapter Cable Buy Now	9.5 Buy Now
3	Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI Buy Now	9.1 Buy Now
4	USB to Serial Adapter, Benfei USB to RS-232 Male (9-pin) DB9 Serial Cable Buy Now	8.8 Buy Now
5	Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux Buy Now	8.6 Buy Now
6	StarTech.com 6in Slimline SATA to SATA Adapter with Power - Slim SATA (F) Buy Now	8.3 Buy Now
7	UGREEN USB 2.0 to RS232 DB9 Serial Cable Male A Converter Adapter Buy Now	8.1 Buy Now
8	StarTech.com 1 Port USB to Serial RS232 Adapter - Prolific PL-2303 - USB Buy Now	7.8 Buy Now
9	TRENDnet USB to Serial 9-Pin Converter Cable, TU-S9, Connect a RS-232 Serial Device Buy Now	7.5 Buy Now
10	DB9 null modem female to female slimline data transfer serial port adapter 2 Buy Now	7.2 Buy Now

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

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9.7/10 our score

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Slimline design reduces leverage strain on computer ports
Converts standard, straight wired cables to null modem wiring
Ul grade 94v-0 connector insulator satisfies flammability requirements
Gold contact plating provides reliable connections with repeated mating cycles
Screws are removable and reversible

2. Cable Matters USB C to Serial Adapter Cable

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9.5/10 our score

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Male to male serial to usb cable provides a convenient solution for communicating with equipment that require a db9 connector, use a db9 mini gender changer (sold separately) if the fixed hex screws will not mate with the equipment port
Simple installation of usb c to serial adapter using the drivers available for download from cable matters, connect a null modem adapter (sold separately) to directly connect two computers with serial cables
Windows & mac compatible with the latest os versions, some equipment may require additional proprietary software that may limit the os compatibility
Rs-232 compatible usb c serial cable is required for many types of equipment including a cnc machine, gps, telescope, set-top box, cisco network switch, sewing machine and more
Usb c to rs232 adapter cable connects from the usb-c port of a computer to a device with a female db9 port, usb bus-powered cable connects to devices for configuration or programming

3. Sabrent USB 2.0 to Serial (9-Pin) DB-9 RS-232 Adapter Cable 6ft Cable [FTDI

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9.1/10 our score

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Side connectors: male thumbscrews
Cable length: 6 ft cable
Provides a 96 byte buffer for each upstream and downstream data transfer
Compatible with usb specification v1.1(0) & usb cdc v1.1, usb 2.0
Supports remote wake-up and power management - no irqs, no irq conflicts

4. USB to Serial Adapter, Benfei USB to RS-232 Male (9-pin) DB9 Serial Cable

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8.8/10 our score

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Easy plug and play installation with 2-years limited warranty.
Supported os: windows 10/8.1/8, windows 7 (32/64-bit)/vista (32/64-bit)/xp(32/64-bit)/ 2000/me/98se mac os 10.1~10.6.
Install as a standard windows com port, full rs-232 modem control signals, rs-232 data signals, txd, rxd, rts, cts, dsr, dtr, dcd, ri, gnd.
Interface: usb - 1.1 type a rs-232 (9-pin) male, cable length: 5 feet
28/24 awg cable gauge with 500kbps data rate.

5. Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux

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8.6/10 our score

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Programmable baud rate from 75 bits per second to 128,000 bits per second. plug-and-play creation of a com port. powered by usb - no external power needed
Allows any pc to connect serial devices and programs that communicate through com ports
24-inch cable with standard usb type a male to standard 9-pin db9 rs-232 serial connector
Pl-2303 chipset for widest possible compatibility with windows (10/8.1/8/7/vista/xp), mac, linux, and other platforms
We love our plugable products and hope you will too. all of our products are backed with a 1-year limited parts and labor warranty and seattle-based email support

6. StarTech.com 6in Slimline SATA to SATA Adapter with Power - Slim SATA (F)

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8.3/10 our score

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F/m
Slimline sata (f) to sata combo (m)
Red
Sata adapter
Serial ata 150/300/600

7. UGREEN USB 2.0 to RS232 DB9 Serial Cable Male A Converter Adapter

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8.1/10 our score

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What you get: usb 2.0 to serial (9-pin) db-9 rs-232 converter cable is backed with 24-months worry-free and customer service support.
Chipset & supported os: pl-2303 chipset for widest possible compatibility with windows (10/8.1/8/7xp), mac, linux, etc,
Conductor & shielding: tinned copper conductor(wire guage#24#28) and triple shielding ensure the best data transfer rate. powered by usb port, no external power adapter required. simple installation, plug & play after one time driver installation,
How it works: ugreen usb to rs232 db9 serial adapter is designed for connecting to serial devices such as db9 equipped serial modems, isdn terminal adapters, digital cameras, label writers, palm pcs, barcode scanners, pdas etc through usb port with 1mbps data transfer rate,
Connectors: with standard usb type a male to standard 9-pin db9 rs-232 serial connector,

8. StarTech.com 1 Port USB to Serial RS232 Adapter - Prolific PL-2303 - USB

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7.8/10 our score

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Broad compatibility: compatible with your usb 1.0 or 2.0 ports, this usb to rs232 converter works with your windows, mac or linux system
Portable design:powered by a usb port, this usb to rs232 serial adapter cablefeatures a lightweight designthat conveniently fits into your carrying case, making it ideal for professionals on the go
Install in almost any laptop or desktop computer through broad operating system compatibility, including windows 8
High-speed 921.6kbps baud rate
Compatible with usb 1.1 or higher ports
Portable and lightweight, the usb-powered design requires no additional power adapter

9. TRENDnet USB to Serial 9-Pin Converter Cable, TU-S9, Connect a RS-232 Serial Device

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7.5/10 our score

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Usb: the usb to serial adapter supports usb 1.1 and it is compatible with usb 2.0 and usb 3.0 ports.
Supported operating systems: the usb to serial converter adapter is compatible with windows and mac operating systems. windows 10, 8.1, 8, 7. mac os 10.11, 10.10, 10.9, 10.8, 10.7, 10.6
Rs-232 serial connector: connect rs-232 serial devices, such as modems or printers, using the widely supported usb standard found in most laptops and desktops today.
Easy setup: simple installation in seconds of the usb to serial 9-pin converter cable. insert the your computer
Flexible cable: integrated and flexible 540mm (21 in.) usb 2.0 cable accommodates most installation scenarios. total cable length of 25 inches when including the rs-232 (9pin) and usb type a.