Hi all,

So i have a bealge bone black with a 4.3 LCD cape running on debian. I also 
have a usb hub with 4 output. I currently use 3 of these output (wifi 
dongle, usb key and a prolific usb to DB9 serial adapter).

The serial adapter is here to read some values from an industrial scale. 

Here is the problem. if the BBB is connected to a computer via the mini usb 
port, everything run well. (with an without a 2.5 amp on the power barrel.)

The second that i disconnect the BBB from the computer, the serial adapter 
will only receive 0xff caracter. Iv'e tried on others computer with DB9 
connector to exclude the scale from the equation.

I have no clue and I can't leave a computer connecter to the BBB just to 
get the serial adapter happy... 

ps. I have 3 different serial adapter and same result for all. Also 3 
different usb hub.


Thanks in advance

Alex

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