Just to add I have also had issues with USB to RS232 adapters in general. In the end I went with a Brainboxes UC-101 and have had no further problems.
Actually took quite a lot of searching to even find the Brainboxes card since I needed one that supported both Windows 7, and Windows 7 64.


I'm very impressed that you have taken the time to research this problem for me, I expected you to come back with "our box is fine, it's a problem with Kermit95....". Good quality support goes a long way and based on that I would recommend your product to anyone.

I found the ES-357 very easy to use as a pure Telnet Server, it just worked!


I did solve my problem… My solution though came in the form of using the different serial card I mentioned before, a brainboxes PX-310, ...  The freeze has never reoccurred.  …


THANK YOU SO MUCH for your brilliant product (US-101)!! ...

We tried [many other brands] and a few other USB to serial adapters.  None of them worked!.. I’ve been buying and returning like crazy.  ...

I finally called IBM/Lenovo out of desperation and somewhere in their internal knowledgebase was a mention of your product working.  So I bought one from Buy.com as a test.. it arrived today.  IT WORKS!   =)

You are likely the only manufacturer on the planet that makes a working serial to USB adapter for IBM/Lenovo.  I would suggest you publish a page on your website including IBM/Lenovo/Windows7 keywords so that people can find you easier. 

My nightmare is over thanks to your brilliant product.  I just bought more!

Thanks again.

Creative NetVentures, Inc.

If this isn't it, then there's something wrong with the COM connections between the device and the PC. Are you by any chance using a relatively cheap USB serial port adapter? You can get them down to about $10.

I found those to be a false economy -- you need a good quality one. I've now changed over to using serial port cards rather than USB adapters -- the one made by Brainboxes is very good, and works very well on my Windows 7 64 bits systems too! ;-)

Pete Dowson