---
product_id: 436876
title: "TU-S9"
brand: "trendnet"
price: "€ 26.36"
currency: EUR
in_stock: true
reviews_count: 8
category: "Tren Dnet"
url: https://www.desertcart.de/products/436876-tu-s9
store_origin: DE
region: Germany
---

# 6Mbps USB 1.1/2.0/3.0 compatible 2-year TRENDnet manufacturer protection NDAA compliant for secure govt use TU-S9

**Brand:** trendnet
**Price:** € 26.36
**Availability:** ✅ In Stock

## Summary

> 🔗 Bridge the old and new with confidence — TU-S9 keeps you connected and compliant.

## Quick Answers

- **What is this?** TU-S9 by trendnet
- **How much does it cost?** € 26.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/436876-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:** Quick installation with included drivers and flexible 21-inch cable for versatile setups.
- • **Trusted Support & Warranty:** Backed by 2 years of manufacturer protection and expert English-speaking tech support during business hours.
- • **Government-Grade Compliance:** NDAA certification ensures your networking solutions meet strict U.S. and Canadian government standards.
- • **Cross-Platform Compatibility:** Works flawlessly with Windows (7 to 10) and Mac OS (10.6 to 10.11), empowering your workflow anywhere.
- • **Seamless Legacy Device Integration:** Effortlessly connect RS-232 serial devices to modern USB ports without compatibility headaches.

## Overview

The TRENDnet TU-S9 USB to Serial 9-Pin Converter Cable delivers reliable 6Mbps data transfer, supports USB 1.1 through 3.0 ports, and connects legacy RS-232 devices to modern computers. NDAA compliant for government use, it features a flexible 21-inch cable, broad OS compatibility, and is backed by a 2-year warranty and dedicated tech support, making it the go-to adapter for professionals bridging classic hardware with today’s technology.

## 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: USB - No problems.

## 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 | #28 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 (DC) |
| Item Dimensions | 2.56 x 1.38 x 0.39 inches |
| Item Weight | 40 Grams |
| Item dimensions L x W x H | 2.56 x 1.38 x 0.39 inches |
| Manufacturer | TRENDnet |
| 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:** Laptop
- **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

![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.

### ⭐⭐⭐⭐⭐ USB
*by R***5 on December 7, 2025*

No problems.

### ⭐⭐⭐⭐⭐ Great quality. Works with Windows 10/11
*by F***D 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.

## 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
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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-09*