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TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length, Plug & Play, White, TU-S9

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4.6 3,117 ratings

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Style: USB to Serial | 2ft

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Purchase options and add-ons

Compatible Devices	Laptop
Specific Uses For Product	personal
Connector Type	USB Type A
Color	White
Item dimensions L x W x H	2.05 x 1.38 x 0.59 inches

About this item

USB: The USB to serial adapter supports USB 1.1 and it is compatible with USB 2.0 and USB 3.0 ports.
RELIABLE TECH SUPPORT: Our team of advisors, support and tech experts are English speaking, and available for all your needs during normal business hours. We take pride in being there for our customers.
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.
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
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.
EASY SETUP: Simple installation in seconds of the USB to Serial 9-Pin Converter Cable. Insert the your computer

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Visible screen diagonal

19" / 49 cm

From the manufacturer

USB 1.1, USB 2.0, USB 3.0, RS-232, Serial, TxD, RxD, RTS, DCD, RI, GND, converter, adapter

Overview


USB Supports USB 1.1 and compatible with USB 2.0 and USB 3.0 ports.	RS-232 Serial Connector Connect RS-232 serial devices such as modems and network switches using the widely supported USB standard found in most laptops and desktops today.	Flexible Cable Integrated flexible 540 mm (21 in.) USB cable accommodates most installation scenarios.

USB to serial adapter, USB to serial converter, USB 1.1, USB 2.0, 3.0 compatible, RS-232, DB-9


	TU-S9	TU-P1284	TU-S9E	TU-S4	TU-S910
		See Details
Customer Reviews	3,117	241	3,117	3,117	3,117
Price	$9.99	—	$59.99	$56.99	$12.99
Standards	1 xUSB Type A • 1 x RS-232 (9-pin) male	USB 1.1 Interface type A • IEEE 1284 centronics 36 male	• 1 x 10/100Mbps port • 1 x RS-232 (9-pin) male	• 4 x DB9 RS-232 male ports • 1 x USB 2.0 Type A port	USB 1.1 ; 1 x USB Type A 1 x RS-232 (9-pin) male
Data Rate	Up to 6 Mbps	12 Mbps	• RS-232 port: Up to 921.6Kbps • Ethernet port: Up to 100Mbps	Up to 460Kbps	Up to 6Mbps
Supported OS	Windows 10, 8.1, 8, 7 • Mac OS 10.11, 10.10, 10.9, 10.8, 10.7, 10.6	Windows 10, 8.1, 8, 7, Vista, XP • Mac OS 10.6-10.9	Windows ( Utility)	Windows and Mac OS	Windows 11, 10, 8.1, 8, 7;Mac OS 10.11, 10.10, 10.9, 10.8, 10.7, 10.6
Operating Temperature	0°C ~ 40°C (32°F ~ 104°F)	0°C ~ 40°C (32°F ~ 104°F)	0° – 40° C (32° – 104° F)	0° – 70° C (32° – 158° F)	0° – 40° C (32° – 104° F)
Operating Humidity	Max. 85% non-condensing	Max. 85% (non-condensing)	Max. 95% non-condensing	Max. 85% non-condensing	Max. 85% non-condensing
Power Consumption	500 mA (max.)	500 mA (max)	1.1W (max)	0.6W (max)	500mA (max.)
Cable Length	540 mm (21 in)	2 m (6.6 ft.)	-	-	3m (10 ft.)
Weight	40 g (1.4 oz.)	105 g (3.7 oz.)	• 102g (3.6 oz.)	• 413g (14.5 oz.)	250g (8.82 oz.)

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	This Item TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length, Plug & Play, White, TU-S9	Recommendations StarTech.com USB to Serial RS232 Adapter - DB9 Serial DCE Adapter Cable with FTDI – Null Modem - USB 1.1 / 2.0 – Bus-Powered (ICUSB232FTN)	dummy Plugable USB to Serial Adapter Compatible with Windows, Mac, Linux (RS-232/DB9 DTE Male Connector, Prolific PL2303GT Chipset)	dummy 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)	dummy BENFEI USB to Serial Adapter, USB to RS-232 Male (9-pin) DB9 Serial Cable, Prolific Chipset, Windows 11/10/8.1/8/7, Mac OS X 10.6 and Above, 1.8M（Not VGA）	dummy OIKWAN USB Type C to RS232 DB9 Serial Port Adapter Cable, FTDI Chipset, Supports Windows 11, 10, 8, 7 and Mac Linux
	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	-17% $9.99 List: $11.99	$32.46	$18.95	-20% $39.44 List: $49.60	$9.99	$13.99
Delivery	Get it as soon as Saturday, May 18	Get it as soon as Saturday, May 18	Get it as soon as Saturday, May 18	Get it as soon as Saturday, May 18	Get it as soon as Saturday, May 18	Get it as soon as Saturday, May 18
Customer Ratings	4.63,117	4.71,838	4.52,206	4.72,286	4.37,270	4.61,742
Easy to install	4.8	4.9	4.8	4.5	4.2	4.5
Value for money	4.6	4.6	4.7	4.4	4.4	4.2
Quality of material	4.6	4.7	4.8	—	4.5	3.8
Tech Support	4.2	4.9	—	4.0	3.8	4.0
Sheerness	—	4.8	5.0	4.3	3.4	—
Sold By	Amazon.com	Amazon.com	Plugable Technologies	Amazon.com	BenfeiDirect	Oikwan
connector type	USB Type A	Serial/USB	USB Type A	usb	DB9	USB 2.0 Type C to DB9
number of ports	3	1	1	1	0	1
current rating	—	256 amps	1 amps	—	1 amps	—
power plug type	no plug	no plug	—	no plug	—	no plug
warranty	—	Lifetime	Limited	Limited	Limited	Limited

Product guides and documents

Installation Manual (PDF)

User Guide (PDF)

Looking for specific info?

What's in the box

TU-S9

Quick Installation Guide

CD-ROM (Driver and User’s Guide)

Product information

Product Dimensions

2.05 x 1.38 x 0.59 inches

Item Weight

1.41 ounces

ASIN

B0007T27H8

Item model number

TU-S9

Customer Reviews

4.6 3,117 ratings

4.6 out of 5 stars

Best Sellers Rank

#9 in Serial Cables

Is Discontinued By Manufacturer

Date First Available

February 14, 2005

Manufacturer

TRENDnet

Language

English

Country of Origin

China

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Product Description

This USB to Serial converter allows you to connect an RS-232 serial device such as a modem to a USB port on your desktop or laptop.

USB
Supports USB 1.1 and compatible with USB 2.0 and USB 3.0 ports.
RS-232 Serial Connector
Connect RS-232 serial devices such as modems and network switches using the widely supported USB standard found in most laptops and desktops today.
Flexible Cable
Integrated flexible 540 mm (21 in.) USB cable accommodates most installation scenarios.

PACKAGE CONTENTS
• TU-S9
• Quick Installation Guide
• CD-ROM (Drivers)

Customer reviews

4.6 out of 5

3,117 global ratings

How customer reviews and ratings work

Customers say

Customers like the performance, quality and ease of use of the adapter. For example, they mention it works flawlessly, the quality is very good for the price and that it's very simple to install. That said, opinions are mixed on length, driver requirement, value, connectivity, and compatibility.

AI-generated from the text of customer reviews

823 customers mention672 positive151 negative

Customers like the performance of the adapter. They say it works flawlessly, works great with their GPS, and configures networks and Fibre Channel switches. They also mention that the drivers from the CD and the adaptor work perfectly. Some customers also mention the drivers direct from Prolific are working great.

"...Pros: Cheap, works fine when it works.Cons: Unhelpful support if it doesn't work, somewhat questionable future-proofing...." Read more

"Worked great! Lasted a long time, would buy again!" Read more

"...cables to connect to older machine controls, and they work right out of the box...." Read more

"...I plugged my Uniden Scanner into the adapter and everything worked perfectly, right out of the box...." Read more

291 customers mention269 positive22 negative

Customers are satisfied with the quality of the adapter. They say it is very good for the price, well constructed, and has high reliability. Some customers also mention that the adaptor is very inexpensive compared to others.

"...These Arduino products are great, very flexible, and relatively cheap. Programming software is free and the language used is more or less "C"...." Read more

"...Pros: Cheap, works fine when it works.Cons: Unhelpful support if it doesn't work, somewhat questionable future-proofing...." Read more

"Worked great! Lasted a long time, would buy again!" Read more

"...I just uboxed and tested it, but it looks just fine. Money well spent." Read more

177 customers mention177 positive0 negative

Customers find the installation of the adapter very simple, straightforward, and easy. They say the driver installed very smoothly and the Devise Manager identified the TU-S9. They also say the cable comes with software that installed smoothly, and explicit instructions for installing it for Windows. Customers also mention that it's easy to go onto their website without providing any login.

"...Programming software is free and the language used is more or less "C". Plenty of programming examples are in existence...." Read more

"...The package info needs to be updated. The driver installed very smoothly and the Devise Manager identified the TU-S9...." Read more

"...You don't have to manually install software, just plug-n-go. Windows will recognize the cable and install any necessary driver...." Read more

"...The driver installation was very fast and completed without any problems...." Read more

99 customers mention69 positive30 negative

Customers are mixed about the length of the adapter. Some mention that it works exactly as described, and is plenty long enough to be wrapped. However, others say that it's short and the build quality is pretty low. Some customers also mention that the cable has some bolted on fastening nuts that shouldn't have been there.

"...The scanner came with a serial cable but my laptop does not have one. To make things worse, I am using an Apple Macbook Pro...." Read more

"...So, the cable works great on the latest PCs, but make sure the manufacturer of your serial device has working drivers for your PC's version of..." Read more

"...The second problem is that it has captive nuts on the DB9 connector...." Read more

"What I liked: - Long cable (21 inches without the connectors) - It just works (tested with Cisco PIX/ASA/Switch/Router)..." Read more

76 customers mention53 positive23 negative

Customers are mixed about the value of the adapter. Some mention it's low cost and a cost effective way of connecting RS232 devices to the computer. However, others say that it'd be a total waste of money and useless.

"...That too was a very simple install and it is free. Just go to their web site, download and install." Read more

"...Overall great product and great price!" Read more

"...I noticed that this adaptor is more expensive than others. Although, I also noticed that the baud rate is much higher on this adaptor than on others...." Read more

"...Kudos to TRENDnet for making such a great product at a great price!" Read more

76 customers mention49 positive27 negative

Customers are mixed about the driver requirement of the adapter. Some mention that it works without installing any device drivers on Windows, Linux, and XP. However, others say that they need to install the driver before they can use it. The drivers are not included on the CD and require the CD to install and a full system reboot.

"...This cable comes with a driver CD and a simple set of instructions: 1)..." Read more

"...The next stumbling block was that Hyperterminal was NOT installed on my ACER...." Read more

"...No driver needed, just plugged it in, looked in device manager under ports, and there it was ready to go...." Read more

"These converters work well and do not need a driver on Windows (either Windows has the driver or it grabs it automatically from update)...." Read more

59 customers mention34 positive25 negative

Customers have mixed opinions about the connectivity of the adapter. Some mention that it connects with no issues, while others say that it doesn't stay connected.

"...The PC connected to the GPS via COM4 and communicated with the GPS unit perfectly through the PC's USB port...." Read more

"...Since neither one is male, they could not connect. The nuts would not even let the adapter plug touch the serial port on my device...." Read more

"...product handles it like a champ...not a single hiccup, and always a rock-solid connection." Read more

"...Oh and Ive also noticed at times the program wont connect to the scope until it has been alt/az aligned thru the hand control." Read more

54 customers mention34 positive20 negative

Customers have mixed opinions about the compatibility of the adapter. Some mention that it was immediately recognized by Windows 8 and OSX, making it fully compatible with many operating systems. However, others say that the driver is never recognized, has some issues with COMs, and causes BSOD issues.

"...of VID_067B&PID_2303, which makes it compatible with drivers across many operating systems without having to resort to tweaks...." Read more

"...This was the terminal one for me. The COM driver constantly caused BSOD issues when I was doing much of any virtual COM work...this was so frequent,..." Read more

"...converter uses a genuine Prolific PL-2303 HXD chip and is fully supported on Windows 8 without any driver installation necessary...." Read more

"...It was easy to install and will also run under Windows XP mode on Windows 7 virtual machine, you will need to use the driver CD as Windows 7 did not..." Read more

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G. Linn

Works Fine and a Problem Solver

Reviewed in the United States on May 19, 2012

Style: USB to Serial | 2ftVerified Purchase

I'm trying to get a 20 year old microcomputer back up again. It requires a serial terminal interface which I no longer have (because I stupidly gave away the VT100 type terminal I used to communicate with it). Rather than buy one that would be expensive and of little future use, I started looking for a more modern solution. Having been working in electronics for many years, I have learned that one can get lucky and everything works okay the first time. Failing that, troubleshooting digital hardware can be difficult and time consuming. As a learning experience with new hardware and to simplify getting the basic RS-232 communication link back up, I purchased an Arduino processor board and an RS-232 "shield" to go with it. The shield simply converts the digital levels from the Arduino to RS-232 levels. These Arduino products are great, very flexible, and relatively cheap. Programming software is free and the language used is more or less "C". Plenty of programming examples are in existence. So, I was able to get the Arduino's RS-232 output going (looping output data) which I first looked at with a scope. Next, I brought up an old tower PC running XP. I started using this computer because it had a DB-9 RS-232 port and a terminal program known as "Hyperterminal". After XP, Hyperterminal has to be purchased separately. Hooking up to the PC and Hyperterminal worked just fine. Next, I wanted to get rid of the tower PC and run things from a small ACER netbook portable. This is where the Trendnet product comes in since the ACER doesn't have a DB-9 port. I was hoping the driver for this device would install automatically but it didn't so I had to use the supplied CD. Since the ACER didn't have an internal CD drive, I hooked up and external one through a USB port and loaded the driver without incident. If you don't have an external drive, I imagine you could use another computer to load and then send the file over your LAN. The next stumbling block was that Hyperterminal was NOT installed on my ACER. Rather than try to figure out why, I looked on line and found another (free) terminal program called RealTerm. Hooking the Trendnet to the Arduino DB-9 and an ACER USB port worked fine. The only thing I noticed, which could be a problem for some, was that no "thumbscrews" were provided on the Trendnet DB-9 end. This end stays mated okay with the DB-9 end on the Arduino, but I don't particularly like to leave DB connectors unsecurred to each other. One could use a short jumper cable, but who needs extra work and cost. Over the years, I have purchased several other Trendnet products and found that they generally did what was advertised and were of good quality for the price.

2 people found this helpful

Helpful

Amazon Customer

I had been using a Gigaware (Radio Shack) USB to ...

Reviewed in the United States on April 25, 2016

Style: USB to Serial | 2ftVerified Purchase

I had been using a Gigaware (Radio Shack) USB to Serial Converter to control a Celestron goto telescope under Windows Vista. When I upgraded my computer system to Windows 10 this device was not supported. I elected to give the TRENDnet TU-S9 (version 2) a try even though the package indicated that the device was supported only through Windows 8. The package info needs to be updated. The driver installed very smoothly and the Devise Manager identified the TU-S9. It now allows me to control the telescope flawlessly.
To test my luck, I installed the device on my wife's Windows 10 computer with the same result - works perfectly.
Don't let you heart skip a beat. With both installations the Device Manager showed the presence of the TU-S9, but when I clicked on "properties," the message came up that the driver wasn't present. In both installations, after shutting down Windows Device Manager and starting it again, it identified the presence of the TU-S9 (this time identifying the com port) and everything worked perfectly from there.

19 people found this helpful

Helpful

N. Winocur

Lynx6 AL5B robot arm now works beautifully in Ubuntu (Karmic RC) Matlab 2009b

Reviewed in the United States on October 28, 2009

Style: USB to Serial | 2ftVerified Purchase

We're using Lynx6 AL5B robot arms for class, controlled using Matlab.

The Karmic RC of Ubuntu I'm using supports this adapter very well; I plugged it in and by the time I could type "sudo chmod a+wrx /dev/tty" and press the tab button, ttyUSB0 already existed and was ready to use (so yes, I ran the command "sudo chmod a+wrx /dev/ttyUSB0" to give the "other" group read/write access.)

From there it was just a matter of changing the baud to match the jumpers on the robot arm's controller (sudo stty -F /dev/ttyUSB0 115200), then using "man stty" to read up on the rest of the possible flags and change them until "sudo stty -a -F /dev/ttyUSB0" would give an output including the following: "-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff
-iuclc -ixany -imaxbel -iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt
echoctl echoke"

(It's possible it'll work even if not all the flags match the above exactly; I just know that this is how I have mine set.)

I have to thank my professor for pointing out the stty command's usefulness, and I won't post any of his matlab code. But the point is that this thing works, and didn't require any crazy linux know-how or compiling anything.

I'm assuming it would work just as well in Windows or Mac.

6 people found this helpful

Helpful

Top reviews from other countries

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Mikael Lindgren

Works great!

Reviewed in Sweden on March 31, 2024

Style: USB to Serial | 2ftVerified Purchase

I'm using it with a Tech2 and Windows XP and it does what it should.

XÓCHITL DOMÍNGUEZ

Excelente

Reviewed in Mexico on March 6, 2022

Style: USB to Serial | 2ftVerified Purchase

Para el que puso que no sirve es porque no instaló los drivers que se requieren, a menos que tengas tu PC lista para su uso. Me sirvió muy bien, el precio es realmente nuevo ya que eso cuestan aquí con una calidad muchísimo menor.

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Ravinder Sage

Good

Reviewed in India on June 24, 2023

Style: USB to Serial | 2ftVerified Purchase

Good

Client d'Amazon

Fonctionne bien

Reviewed in France on October 20, 2022

Style: USB to Serial | 2ftVerified Purchase

Utilisé pour mettre à jour un kenwood ts 480sat.

Translate review to English

elena r.

convertitore seriale funzionante si w10 pro

Reviewed in Italy on February 8, 2018

Style: USB to Serial | 2ftVerified Purchase

Ho dovuto sostituire il mio vecchio convertitore seriale, perfettamente funzionante, che non veniva riconosciuto dal mio nuovo PC aziendale Windows 10 Pro. Non appena ho attaccato il cavo USB al pc la periferica è stata riconosciuta immediatamente ed è subito pronta all'uso. Acquisto consigliato visto i problemi di driver avuti con altri convertitori

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TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length, Plug & Play, White, TU-S9

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USB

RS-232 Serial Connector

Flexible Cable

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TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length, Plug & Play, White, TU-S9

Purchase options and add-ons

About this item

Similar item to consider

Frequently bought together

Similar items that may ship from close to you

Important information

Legal Disclaimer

Visible screen diagonal

From the manufacturer

Overview

USB

RS-232 Serial Connector

Flexible Cable

Compare with similar items

Videos

Product guides and documents

Looking for specific info?

What's in the box

Product information

Feedback

Where did you see a lower price?

Product Description

Customer reviews

Customers say

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