--- product_id: 436876 title: "USB to Serial 9-Pin Converter Cable, TU-S9" brand: "trendnet" price: "€ 25.82" currency: EUR in_stock: true reviews_count: 13 category: "Tren Dnet" url: https://www.desertcart.es/products/436876-usb-to-serial-9-pin-converter-cable-tu-s9 store_origin: ES region: Spain --- # RS-232 serial device support USB 1.1/2.0/3.0 compatible 6Mbps 2-year manufacturer protection USB to Serial 9-Pin Converter Cable, TU-S9 **Brand:** trendnet **Price:** € 25.82 **Availability:** ✅ In Stock ## Summary > 🔗 Bridge the old and new—connect with confidence! ## Quick Answers - **What is this?** USB to Serial 9-Pin Converter Cable, TU-S9 by trendnet - **How much does it cost?** € 25.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/436876-usb-to-serial-9-pin-converter-cable-tu-s9) ## Best For - trendnet enthusiasts ## Why This Product - Trusted trendnet brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Simplicity:** Get up and running in seconds with easy installation and included driver CD-ROM. - • **Reliable Support & Warranty:** Backed by TRENDnet’s 2-year protection and expert English-speaking tech support during business hours. - • **Seamless Legacy Integration:** Effortlessly connect vintage RS-232 devices to modern USB ports without missing a beat. - • **Universal USB Compatibility:** Works flawlessly across USB 1.1, 2.0, and 3.0 ports for ultimate flexibility. - • **Government-Grade NDAA Compliance:** Built to meet strict U.S. and Canada government networking standards—trust and security guaranteed. ## Overview The TRENDnet TU-S9 USB to Serial 9-Pin Converter Cable is a compact, NDAA-compliant adapter that enables seamless connection of RS-232 serial devices to USB ports. Supporting USB 1.1 through 3.0 with a 6Mbps data rate, it features a flexible 21-inch cable and broad OS compatibility (Windows and Mac). Backed by a 2-year manufacturer warranty and reliable tech support, it’s the go-to solution for professionals needing legacy device connectivity in modern setups. ## 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. 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) Review: Works Fine and a Problem Solver - 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. Review: Lynx6 AL5B robot arm now works beautifully in Ubuntu (Karmic RC) Matlab 2009b - 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. ## Features - USB: The USB to serial adapter supports USB 1.1 and it is compatible with USB 2.0 and USB 3.0 ports with a 6Mbps Data Rate - NDAA COMPLIANT: With our NDAA compliant USB to Serial 9-Pin Converter Cable, you can plan and install networking solutions that Government customers demand today (U.S. and Canada Only) - MANUFACTURER PROTECTION: We stand by the quality of our products.The TU-S9 USB to Serial 9-Pin Converter Cable is backed and supported with 2 years of TRENDnet Manufacturer Protection. - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0007T27H8 | | Best Sellers Rank | #17 in Serial Cables | | Brand | TRENDnet | | Built-In Media | CD-ROM (Driver and User’s Guide), Quick Installation Guide, TU-S9 | | Color | White | | Compatible Devices | Gateways, Laptop, Modems, PLC controllers, POS systems, Printer | | Connector Type | USB Type A | | Customer Reviews | 4.6 out of 5 stars 3,200 Reviews | | External Testing Certification | CE, FCC | | Finish | White | | Global Trade Identification Number | 00710931303209 | | Input Voltage | 5 volts_of_direct_current | | Item Dimensions | 2.56 x 1.38 x 0.39 inches | | Item Weight | 40 g | | Item dimensions L x W x H | 2.56 x 1.38 x 0.39 inches | | Manufacturer | TRENDnet | | Mfr Part Number | TU-S9 | | Model Number | TU-S9 | | Nominal Power | 2.5 watts | | Number of Items | 1 | | Number of Ports | 3 | | Package Quantity | 1 | | Power Plug Type | No Plug | | Specific Uses For Product | Serial Devices | | UPC | 710931303209 | | Unit Count | 1 Count | | Warranty Description | 2 year | ## Product Details - **Color:** White - **Compatible Devices:** Gateways, Laptop, Modems, PLC controllers, POS systems, Printer - **Connector Type:** USB Type A - **Item dimensions L x W x H:** 2.56 x 1.38 x 0.39 inches - **Specific Uses For Product:** Serial Devices ## Images ![USB to Serial 9-Pin Converter Cable, TU-S9 - Image 1](https://m.media-amazon.com/images/I/51vgKmQZPJL.jpg) ## Questions & Answers **Q: will this connector work for my royal cash register? I have bought scanners for the register, but wonder if the USB scanners may last longer.** A: This is a serial to USB converter, not vice-versa. If your scanner has a USB connection already, then this item is of no use to you. By the way, less and less laptops (and I would assume desktops) come equipped with a COM port (that is why I needed this converter), so opting your USB port for a COM port sounds more of an own goal. Perhaps I misunderstood your question. **Q: is it prolific** A: Prolific chips often exhibits erratic behavior with some serial devices. The reliable chip is the FTDI chip. **Q: Will this work to connect a computer to a CISCO Switch via the console cable?** A: Yesssss its a great usb to serial cable **Q: I assume this will plug and play with WIN10 64x ...? thanks!** A: It is just a cable so I would assume so. My husband uses it with his Windows 10 laptop to connect to his telescope. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works Fine and a Problem Solver *by G***N 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. ### ⭐⭐⭐⭐⭐ Lynx6 AL5B robot arm now works beautifully in Ubuntu (Karmic RC) Matlab 2009b *by N***R on October 28, 2009* 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. ### ⭐⭐⭐⭐⭐ Does what it needs to do with simplicity *by M***K on July 27, 2015* One of my few 5 star reviews, but definitely worth it. I needed to connect a VERY old Windows XP laptop to a piece of audio gear that seemed to be failing, and the only access was via an old DB9 com port using the vendor's no-longer-supported software. This cable comes with a driver CD and a simple set of instructions: 1) insert the CD, 2) click on "Install Driver", and 3) plug in the cable. The driver installation was very fast and completed without any problems. The old (and slow) Windows XP laptop immediately recognized the device and loaded the drivers when I plugged in the cable, giving me the "hardware ready to use" message in about a minute. It installed the connection as COM6, so I just needed to swap that with COM1 (which the audio-gear software needed to see) and the software connected with the device and I was able to restore operations. The DB9 end is male, so if you need something longer than 2 ft, a standard DB9 male to female cable connects securely, since this cable has the connection nuts on the DB9 connector which the standard cable can screw into to hold them together. For less than $10 US, this was a bargain and helped me save a church several thousand dollars since they didn't have to replace the hardware. The worst thing about the product was the molded plastic packaging that you have to cut to get to the product. ## Frequently Bought Together - TRENDnet USB to Serial 9-Pin Converter Cable, TU-S9, USB to RS232 Serial Adapter, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 64cm (25 in.) Cable Length, Plug & Play, White - USB to RJ45 Console Cable 2pack, Essential Tool for Cisco, NETGEAR, Ubiquiti, LINKSYS, TP-Link Routers/Switches Connection, Compatible with Windows, Mac, Linux Laptops - OIKWAN DB9 to RJ45 Console Cable,Compatible with Cisco Routers Switches Firewalls CAB-CONSOLE-RJ45 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.es/products/436876-usb-to-serial-9-pin-converter-cable-tu-s9](https://www.desertcart.es/products/436876-usb-to-serial-9-pin-converter-cable-tu-s9) --- *Product available on Desertcart Spain* *Store origin: ES* *Last updated: 2026-08-19*