On Sunday, 28 February 2016 14:25:16 UTC-5, [email protected] wrote: > 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 I forgot to mention that the usb hub is powered by a 2.5 amp power supply
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