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Thank you for reply.
But unfortunately, DG_CONTROL/DAT_CAPABILITY is valid only after the data source is opened, right? (Valid states between 4 to 7).
So, as I cannot open the DS when the device is turned off (that means I am still in state 3), how can I proceed to there?
BTW, when the device is powered on, my program runs just fine.
And one work around is ping the device –yes! it is connected on LAN–, but that is not very TWAIN way and I don’t like that.