Hi Ajay-san
Unfortunately no difference happened.
Revised code is below
Please note that I am using MODE3, which doesn’t generate serial number and I don’t understand
use Open by serial number.
Beside I tested with MODE0, which generates FT4222 A and B,
I tested both FT4222 A and B. Both generate same error before.
Since Visual Studio works fine with MODE3, this issue came from LabVIEW interface to DLL.
What do you think?