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StarTech.com USB to Serial Adapter - 1 port - USB Powered - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter (ICUSB2321F)

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4.7 1,838 ratings

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$32.40 with 38 percent savings

List Price: $51.99

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Size: 1 Port

Style: USB 2.0

Pattern Name: Adapter

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Purchase options and add-ons

Compatible Devices	Monitor
Specific Uses For Product	personal
Connector Type	Serial Adapter
Color	Black
Item dimensions L x W x H	1.8 x 1.6 x 0.9 inches

About this item

MULTI-USE FUNCTIONALITY: Use this versatile USB to serial RS232 adapter for everything from digital signage to connecting point of sale systems and barcode scanners.
CUSTOMIZABLE SOLUTION: This USB serial hub features an FTDI chipset, making it highly customizable and compatible, and the ideal solution for any setup.
COMPACT DESIGN: Designed with a small form factor, this serial RS232 converter is USB powered and requires no bulky power adapters or an outlet.
EASY INSTALLATION: This serial adapter lets you enjoy simple installation and operation with COM port retention that provides robust serial connectivity for legacy devices.

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USB to Serial RS-232 Adapter with LED Indicators, FTDI Chipset, Supports Windows 11/10/8.1/8/7/, Mac OS X 10.6 and Above

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From the manufacturer

Add an RS232 serial port with COM retention to your laptop or desktop computer through USB


The 1-Port USB to Serial RS232 Adapter Cable with FTDI chipset and COM Retention converts an available USB 1.1 or 2.0 port into an RS232 serial DB9 port to connect, monitor and control your serial devices.	This compact adapter features COM retention, allowing the same COM port value to automatically be re-assigned to the port if the cable is disconnected and re-connected to the host computer, or if the system is rebooted. It uses the FTDI chipset which supports additional customization, advanced features, and compatibility not necessarily offered by other solutions.	Compatibility with a broad list of Operating Systems including Windows, Windows CE, Mac OS and Linux, makes this product easy to integrate into mixed environments.

Compare with similar items

	This Item StarTech.com USB to Serial Adapter - 1 port - USB Powered - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter (ICUSB2321F)	Recommendations DriverGenius USB to Serial RS232 DB9 Adapter Cable with 9 x LED Indicators - Prolific PL2303 - for Windows 11, macOS 14 Sonoma, Linux (USB232A-E-A, 3ft/1m)	dummy DriverGenius USB-C to Serial RS232 DB9 Adapter with 9 x Data Monitoring LEDs (USB232A-E-C, Windows 11, macOS 14 Sonoma)	dummy 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 (ICUSB232PRO)	dummy StarTech.com DB9 to RJ45 Modular Adapter - F/F - Serial adapter - DB-9 (F) to RJ-45 (F) - GC98FF, Black	dummy StarTech.com DB9 RS232 Serial Null Modem Adapter - F/F - Null modem adapter - DB-9 (F) to DB-9 (F) - NM9FF
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	-38% $32.40 List: $51.99	$20.99	$22.99	-6% $27.27 List: $28.99	-67% $3.33 List: $9.99	-42% $5.17 List: $8.99
Delivery	—	Get it as soon as Friday, May 31	Get it as soon as Friday, May 31	Get it as soon as Friday, May 31	—	—
Customer Ratings	4.71,838	4.3195	4.3195	4.6140	4.6475	4.5283
Value for money	4.6	—	—	4.0	4.5	—
Sold By	Amazon.com	Vtop Online Shop	Vtop Online Shop	DC Xtras, LLC	Amazon.com	Amazon.com
connector type	Serial Adapter	RS-232	RS-232	Serial/USB	RJ45	Serial Adapter
number of ports	1	1	1	1	2	1
current rating	—	1 amps	1 amps	1 amps	—	1 amps
power plug type	no plug	—	no plug	no plug	no plug	—
warranty	Limited	Limited	Limited	—	Lifetime	Lifetime

Product guides and documents

User Manual (PDF)

Product information

Product Dimensions

1.8 x 1.6 x 0.9 inches

Item Weight

3.17 ounces

ASIN

B004ZMYTYC

Item model number

ICUSB2321F

Customer Reviews

4.7 1,838 ratings

4.7 out of 5 stars

Is Discontinued By Manufacturer

Date First Available

May 5, 2011

Manufacturer

StarTech.com

Language

English

Country of Origin

Taiwan

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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What's in the box

StarTech.com USB to Serial Adapter

Product Description

The 1-Port USB to Serial RS232 Adapter Cable with FTDI chipset and COM Retention converts an available USB 1.1 or 2.0 port into an RS232 serial DB9 port to connect, monitor and control your serial devices. This compact adapter features COM retention, allowing the same COM port value to automatically be re-assigned to the port if the cable is disconnected and re-connected to the host computer, or if the system is rebooted. The Serial RS232 Adapter Cable uses the FTDI chipset which supports additional customization, advanced features, and compatibility not necessarily offered by other solutions. Compatibility with a broad list of Operating Systems including Windows, Windows CE, Mac OS and Linux, makes this product easy to integrate into mixed environments. Backed by a StarTech..

Top Brand: StarTech.com

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100K+ customers rate items from this brand highly

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Customer reviews

4.7 out of 5

1,838 global ratings

How customer reviews and ratings work

Customers say

Customers like the performance, ease of installation, quality and cord length of the adapter. For example, they mention it works well, it's easy to install and use and that the driver installed without any problems. Some appreciate the null modem cable for prototyping and that it'll be a great value for the money.

AI-generated from the text of customer reviews

186 customers mention173 positive13 negative

Customers are satisfied with the performance of the adapter. For example, they mention it works well, it works flawlessly in Windows 10, and has a longer cable than most other brands. It also works great on ASA/Catalyst, Powerconnect, Procurve, and other firewalls and routers. The driver works great with Macs and there are no connection issues. Some say it works perfectly to connect their Uniden BCT15X programmable scanner to their PC.

"Completely painless to get working under Linux, and works just as expected, operating at standard RS-232 levels (±5V; it is not a TTL serial port)...." Read more

"Great because it uses FTDI chipset which is very important. Prolific chipsets are not as reliable...." Read more

"Works well to connect to the serial console on my PC Engines APU2 router...." Read more

"...cable for my SAGE Alerting Systems model 1822, and it does the job for both logging alerts to my computer, as well as programming the system...." Read more

39 customers mention39 positive0 negative

Customers find the installation of the adapter to be easy. They mention it's simple to use, and the driver installs without any problems. Some say it'll connect to their HyperTerminal and allow them to talk back. Customers also say it’s a perfect tool for installers of equipment with serial console connections. They find it convenient to have a Null Modem and USB-to-DB9 adapter in one, and say the technical support is excellent.

"Completely painless to get working under Linux, and works just as expected, operating at standard RS-232 levels (±5V; it is not a TTL serial port)...." Read more

"...It’s entirely plug and play as well...." Read more

"...Their products are are always high quality and their technical support is excellent, with current manuals and drivers always available online...." Read more

"...No drivers were needed in Windows 10, it was plug and play. It does come with a driver disk if you need it for older OSes...." Read more

39 customers mention39 positive0 negative

Customers are satisfied with the quality of the adapter. They mention that it has a good solid construction, and is very reliable. They appreciate the premium materials and the dependable FTDI chipset. Some say that the adaptor works well on a cash register and the activity lights are a nice touch. Overall, customers are happy with the performance and recommend it to others.

"...The TX/RX activity LEDs are a great feature, and it supports up to 3000000 baud (3 Mbaud)...." Read more

"...Their products are are always high quality and their technical support is excellent, with current manuals and drivers always available online...." Read more

"...I have used them under both linux and macos. They are very convenient for serial consoles and the like...." Read more

"...rock solid FTDI FT232R chip which in my experience is by far the most reliable in terms of the chip itself and drivers for modern Windows(Vista+)..." Read more

31 customers mention28 positive3 negative

Customers like the cord length of the adapter. For example, they mention it's a great cable for prototyping, RJ45 -> serial cables are nice, and it works perfectly to connect to the console port. Some say it'll also work as a USB to Serial Adapter and a good console patch cord.

"...Next best thing is it has a built in null modem and the correct female DB9 connector so no having to use separate null modem or gender changer...." Read more

"One of the nicest null modem cables I've used. Works flawlessly in Windows 10 off a USB 3 port...." Read more

"This is a great cable for prototyping if your board doesn't support a TTL connection...." Read more

"...The RJ45 -> serial cables are nice because they don't need drivers, but they use up your NIC port, so if you're working in a datacenter that doesn't..." Read more

18 customers mention18 positive0 negative

Customers find the product well worth the higher price. They say it works well and is a great buy.

"...The Tx/Rx LEDs on the serial end are a very nice touch. Well worth the money." Read more

"...This is really sturdy, plenty of cord length. Worth the money." Read more

"...Well worth the money." Read more

"...a RS232 port; this one is the best I have found and the price is very reasonable." Read more

14 customers mention10 positive4 negative

Customers like the connectivity of the adapter. They mention that it retains the same COM port number as it plugs in, and that the ability to save the Com port designation is a great time saver. Some appreciate the fixed-port feature, which allows them to save profiles in secure CRTs.

"...It also remembers the COM port." Read more

"Works great so far!! The fact that it retains the same com port number is super helpful... previous prolific models that I have uses would change..." Read more

"It did not work as a serial connection between the radio and computer!!" Read more

"...of some of the extra features this has over others, like remembering COM ports...." Read more

10 customers mention7 positive3 negative

Customers like the driver of the adapter. They mention that it's plug and play, and the drivers are already present in Windows. Some are impressed that the driver loaded automatically under Windows 8 Pro and the adaptor worked.

"...No drivers were needed in Windows 10, it was plug and play. It does come with a driver disk if you need it for older OSes...." Read more

"works with Meridian audio equipment, no drivers needed" Read more

"The only con I can think of is that you need to install the driver, other than that, it works great...." Read more

"...that this unit has the dependable FTDI chipset and the drivers are already present in Windows...." Read more

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Amazon Customer

Highly recommended

Reviewed in the United States on April 6, 2023

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

Completely painless to get working under Linux, and works just as expected, operating at standard RS-232 levels (±5V; it is not a TTL serial port). The TX/RX activity LEDs are a great feature, and it supports up to 3000000 baud (3 Mbaud). I have a laptop with integrated serial ports, but this is kind of better, since it gives you visual activity indicators and has a higher maximum speed. If you need to work with older equipment that uses RS-232, this is a great option.

2 people found this helpful

Helpful

A. L. Chapman

Great all-in-one serial adaptor

Reviewed in the United States on July 3, 2019

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

Great because it uses FTDI chipset which is very important. Prolific chipsets are not as reliable. Plugged it in my Win10 PC and let Windows deal with it. Said it installed OK but I had to do a driver update in Control Panel Device Manager. I pointed it to the included driver disk's Win10 FTDI folder and it worked great. Next best thing is it has a built in null modem and the correct female DB9 connector so no having to use separate null modem or gender changer. The final plus are the LEDs. The green LED (transmitting to USB end of cable) blinks to let you know data is uploading from the device while an orange one blinks to indicate serial traffic coming to the device on the RS-232 DB9 end. This eliminates another bulky serial port tester and allows for instant visual feedback of serial port activity. Finally, the DB9 has twin thumb screws to secure it to the device to ensure it doesn't come off even if the device is handled. I personally use this to manage my vintage HP 48SX calculator inside an environmental case that has a RS-232 male connector on the outside.

4 people found this helpful

Helpful

Phillip Griffith

serial console for the PC Engines APU2 router

Reviewed in the United States on April 25, 2023

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

Works well to connect to the serial console on my PC Engines APU2 router. Linux detected it as /dev/ttyUSB0 without resorting to the driver CD that StarTech ships in the box. sudo grep -i tty syslog. Teklager has a very good description of how to make this connection from Linux using PuTTY.

Helpful

TuesdayOra

This one’s for the EAS enthusiasts (and operators alike)

Reviewed in the United States on March 12, 2022

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

I’m using this cable for my SAGE Alerting Systems model 1822, and it does the job for both logging alerts to my computer, as well as programming the system. I’d definitely recommend this if you need to program your encoder or pull data from it. It’s entirely plug and play as well. I didn’t need to hunt down any special drivers or go into device manager to figure things out there, it just works! Overall, so far, this cable seems to fit my needs the best.

Helpful

Eli Lilly

Installs fine on Windows 10

Reviewed in the United States on January 1, 2024

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

On Windows 10 I just plugged it into the computer, which recognized the chip set and installed the driver. Then plugged the DB9 into my device, looked in the device manager to see what port was assigned, and set my device software accordingly. Five minutes max

Helpful

MMB

Quality product from a quality company

Reviewed in the United States on September 2, 2023

Size: 1 PortStyle: USB 2.0Pattern Name: AdapterVerified Purchase

I've been buying products from StarTech for a very long time. Their products are are always high quality and their technical support is excellent, with current manuals and drivers always available online. The USB to Serial Adapter uses industry standard FTDI chipsets and remembers the last serial port number assigned to the device which eliminates searching device manager for determining the port number or resetting the port number.

Helpful

Worked like a charm!

Reviewed in the United States on February 15, 2022

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

The CD that came with the cable has nearly every FTDI USB-to-whatever driver known to man included on it. I never once had to connect my PC to the internet to download a driver, just plugged this in and installed the included driver from the CD and had a serial console to my device instantly. The Tx/Rx LEDs on the serial end are a very nice touch. Well worth the money.

Helpful

Steven

Good reliable UBS to null modem cable

Reviewed in the United States on July 29, 2018

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

One of the nicest null modem cables I've used. Works flawlessly in Windows 10 off a USB 3 port. I love how it has lights on it so I can confirm rcx and trx signals. I've used this successful to log into a number of network appliance consoles. No drivers were needed in Windows 10, it was plug and play. It does come with a driver disk if you need it for older OSes.

Due not that the DB9 side stick out a little bit further than normal because it has the electronics in it for the USB to Serial conversion, keep that in mind if you have to work in a tight space.

2 people found this helpful

Helpful

Top reviews from other countries

Translate all reviews to English

Jean-michel Paulet

flawless

Reviewed in Canada on July 27, 2023

Size: 1 PortStyle: USB 2.0Pattern Name: AdapterVerified Purchase

Work with windows 11 no drivers required to bring modbus back to life. Works well with vmware as well with windows xp.

John Savage

Worked straight off, very reliable.

Reviewed in the United Kingdom on March 7, 2024

Size: 2 PortStyle: USB 2.0Pattern Name: AdapterVerified Purchase

Replaced a series of similar products all of which were unreliable. Not this one, however - it has worked day and night since installation. Bit expensive, but worth it for lack of hassle.

Bear

Works as a cat cable for Yaesu FTDX1200

Reviewed in the United Kingdom on March 2, 2024

Size: 1 PortStyle: USB 2.0Pattern Name: AdapterVerified Purchase

After several attempts at finding a usb serial cable that works as a cat cable, I finally got this and it works well. Most other cables are £10-15, those didn't work or didn't work consistently. Had to pay more for this (£25), but it works. All functions, including PTT. Perfect for use with WSJT-X.

Sascha

Works fine

Reviewed in the United Kingdom on February 21, 2024

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

Bought to check if my old ugreen adapter was the cause of my problem... it wasn't, but when i solved the issue i had this adapter worked perfectly with it.

Anthony R.

Nickel

Reviewed in France on January 12, 2024

Size: 921.6 Kbps / Null ModemStyle: Null ModemPattern Name: AdapterVerified Purchase

Un peu cher pour ce que c'est mais comme dhab avec startech très bonne qualité

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StarTech.com USB to Serial Adapter - 1 port - USB Powered - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter (ICUSB2321F)

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StarTech.com USB to Serial Adapter - 1 port - USB Powered - FTDI USB UART Chip - DB9 (9-pin) - USB to RS232 Adapter (ICUSB2321F)

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Add an RS232 serial port with COM retention to your laptop or desktop computer through USB

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