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- #121 in Serial Cables
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. USBSupports USB 1.1 and compatible with USB 2.0 and USB 3.0 ports.RS-232 Serial ConnectorConnect RS-232 serial devices such as modems and network switches using the widely supported USB standard found in most laptops and desktops today.Flexible CableIntegrated flexible 540 mm (21 in.) USB cable accommodates most installation scenarios. PACKAGE CONTENTS• TU-S9• Quick Installation Guide• CD-ROM (Drivers)
MikeS
Reviewed in the United States on February 9, 2025
These are great. Unlike a lot of the cheap ones, these provide actual EIA-232 (RS-232) bipolar voltage levels. Many/most of the cheap ones don't, they only provide positive voltage signals. For many devices, that doesn't matter, but for some it does and this one will work when others don't. So, this is the one to get if you just want it to work with _anything_ using EIA-232.USB VID/PID shows it uses a Prolific PL2303GT USB/serial bridge chip. High quality, highly recommended.
Denis
Reviewed in the United States on August 16, 2024
This is the fifth cable now and voila, it works with my diagnostic kit-MSV-2. Before trying the trendnet, it was disappointment after another not to mention the waste of money with useless serial cables I cant return from here Kenya. Thanks trendnet I had almost given up
Fred
Reviewed in the United States on June 3, 2024
My USB to serial adapter was not working with Windows 11 so I selected this as its replacement.The adapter works as expected. Installation was easy as the drivers are part of Windows 11.No issues so far.I recommend this product to people looking for a USB to Serial adapter.
Mikael Lindgren
Reviewed in Sweden on March 31, 2024
I'm using it with a Tech2 and Windows XP and it does what it should.
XÓCHITL DOMÍNGUEZ
Reviewed in Mexico on March 6, 2022
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.
elena r.
Reviewed in Italy on February 8, 2018
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
David Roche
Reviewed in the United Kingdom on December 19, 2018
Have been using this Serial to USB device for a good few years now and has served me well . I think i recall once or twice having issues with the drivers over the 4 or 5 years but it was easily solved by going to the TRENDnet website and updating the drivers. no complaints and a solid product.
Anon
Reviewed in Canada on May 30, 2014
Using this to communicate with PIC micro-controllers using a CCS serial port monitor that is built into their compiler and it is working perfectly. Install the drivers and the program detects the comport properly. The only thing that I don't like about it is that it needs to install the drivers every time you plug it into a different usb port and each usb port is then a different comport, so if you switch usb ports remember to change the setting in you serial port monitor to make sure that you are reading the correct port. Other than that it is solid for a solid price.
G. Linn
Reviewed in the United States on May 19, 2012
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.
Perry The Cynic
Reviewed in the United States on January 31, 2011
This is for use on Macintosh; I haven't tried to use this on Windows PCs or other types of systems.Pros: Cheap, works fine when it works.Cons: Unhelpful support if it doesn't work, somewhat questionable future-proofing.Summary: Cheap enough to buy and throw out if it stops working.As of today, this works fine on most Macs but not on some: any Mac running a 64-bit kernel will not see the device at all. TrendNet does not seem to think this is a problem. There is a work-around (see below) if you're technically inclined, but this doesn't fill me with confidence in TrendNet's Macintosh support.This device is half the price of its main competition. If you know what you're doing, it's money well saved. If you want "just works" on a Mac, you may want to consider alternatives.On the upside, it actually provides enough power for serial-port-powered devices (such as the GC-IRL) to work reliably.The Technical Detail: The official TrendNet device driver for Mac does not have a 64-bit version. This means that any Mac that runs a 64-bit kernel will simply not see this device. TrendNet support will give you the run-around and tell you it's all your fault (system too old, system too new, whatever they can think of) but apparently won't understand what "64-bit driver" actually means. It turns out that they simply re-package the driver from their chipset manufacturer; if you're lucky, they will finally point you at prolific.com.tw, which has a perfectly fine 64-bit driver for Snow Leopard that works without problems.
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