Well, yes my Serial adapter appears in the device list as ttyUSB0 (usb serial).
But sadly when I go to 'Console' on the Serial port test app, I get an exception 'You do not have read / writer permission to the serial port'.
Looking at the source for the serial library, it does attempt to 'su' before opening the port, but without a password. Looking at: http://zenpad.doubtech.com/
, it seems that they have removed su BUT you can put it back.
I don't have time to do that now. I'll post again when I have had a chance to try it.