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The "BP1" in this case indicates that "Block Piece 1" should be used (the text comes from the text field on the System Settings screen), and the 65 indicates that a block from the 65mm group should be used.
Setting up the device as an ART or Nucleo blocker
In order for Rx-Universe to accept the blocking information from either an ART or a Nucleo, and in order to correctly send the block information, the device interface must be set up to identify the device as an ART or a Nucleo. On the Blocking tab of the VCA device setup, check the appropirate option (note that only Nucleo OR ART can be active - Rx-Universe will not allow both boxes to be checked).
