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We sell a tested USB adapter to make it easy for you to get it working Just go to the Pricelist it includes software CD. and is only $14.00

USING the PowerMaster with a USB port

IOGEAR model GUC232A USB Serial Port Adapter ( see above note)

Make sure you have the proper drivers from the internet
this one supports USB 2.0 and can go up to 230 Kbps.

Cheapie Brands,  - many users have e-mailed they have successfully used several USB adapters.

Make sure you get their latest drivers from their web sites, and they should work.

For instance:

One that is very inexpensive is the Byterunner Y-105 which is priced @ 
$8.69 direct from Byterunner. You can see / order one here:

http://www.byterunner.com/byterunner/product_name=Y-105