Returned Error 255 by GpRen

Q: In the program of GP-IB, GPIni and GpIfc return OK, but GpRen returns error [255]. How to remove this error?

A: The reason that GpRen returns error [255] is as follows, please confirm it again.

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• The interrupt level is duplicate.
  

• The IRQ of board and the IRQ of program is not the same one.

• The cable is not connected.