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When connecting the new NIDAQPad on USB the system detected a new hardware and installed the software regardless of the allready installed software. In MAX the new NIDAQPad appears as Dev2 with a different Ser.-No.
That's expected and normal behavior. As long as you don't remove the first DAQPad from MAX another DAQPad will be recognized as a different device and the driver assigns a new device ID (Dev2). You need to go to MAX and change the name if needed or you need to make your software try various device IDs until no error occurrs anymore.