@CCS wrote:
I am using VB.net and I am trying to get my application to determine if the scanner is online.
I’m not familiar with the VB library you are using but it should provide a way to query capabilities via the DG_CONTROL/DAT_CAPABILITY/MSG_GET triplet. CAP_DEVICEONLINE will tell you if the scanner is online. Read about that capability, and capabilities in general, in the TWAIN specification.