Search Images Maps Play YouTube News Gmail Drive More »
Web History | Sign in


TRENDnet TU-S9 Serial Adapter - USB - RS-232

$14 online
The TRENDnet TU-S9 USB to Serial Converter connects any RS-232 serial device to your laptop or desktop computer using a USB port. This nine-pin USB to serial converter supports a data transfer rate of up to 500Kbps and can also detect USB suspend condition. It is compatible with multiple operating systems. You can easily install the USB to RS-232 serial converter with its universal plug and play capability. It supports BUS power and needs no external power adapter.

Online stores

Sellers Seller Rating Details Base Price Total Price
Walmart 84% positive (1,993) $13.99 +$0.84 tax and $5.99 shipping $20.82
eBay - surveillent-international No rating No tax $9.26 +$7.99 shipping $17.25
Walmart - SURVEILLENT, LLC. No rating Free shipping, No tax $17.11 $17.11
Walmart - My Goods No rating Free shipping, No tax $14.29 $14.29
Walmart - Tri State Camera No rating Free shipping, No tax $16.10 $16.10
Walmart - BuyVPC No rating Free shipping, No tax $13.99 $13.99
Walmart - No rating Free shipping $13.99 +$0.84 tax $14.83
Walmart - ProMax Commerce No rating Free shipping, No tax $15.96 $15.96
Walmart - ComegaCity No rating Free shipping, No tax $15.92 $15.92
Walmart - No rating Free shipping, No tax $15.14 $15.14


71 reviews
  • USB to serial
    - October 3, 2017 - Micro Center
    Much better than the ftdi chipset. I hate the ftdi installing on different ports all the time when one fails. Plug 5 different ones in the same port all show up on same port with the prolific chipset. However you do that with the ftdi you end up with 5 different com ports and at worst it won’t install unless you have admin rights and for my application I’d the com port is above 20 it doesn’t work so this becomes a nuisance. Prolific ftw! Read full review
  • Short cable, inferior chipset
    - January 11, 2017 - Micro Center
    Adapter worked fine in a basic application. However, the cable between the DB-9 connector and the USB connector is very short - says 2 feet but feels like less. Not long enough for many practical applications. The adapter also uses the Prolific chipset which is known to have driver issues. I will be taking the adapter back the next time I'm over that way Read full review
  • This works great with Windows 10.
    - September 25, 2015 - Micro Center
    I bought this to use with a PC that does not have a serial port like most modern PC's. This one works great even with Windows 10. There is a driver disk included but a Windows 10 PC will find the drivers it needs automatically when connected to the internet. I'm using this with SecureCRT and it is very easy to set up. It grabbed an available com port and I just had to select it in the terminal program to connect. Read full review


Weight2.65 oz
Min Operating Temperature32 °F
Max Operating Temperature104 °F
Interfaces1 x RS-232 - 9 pin D-Sub (DB-9)