...
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
On the Blocker tab of the device screen:
...
- generator prism will usually be set, to minimize prism needing to be blocked. This is the amount of prism to be reserved for the generator, and the remainder (if any) will be blocked. Note that there is a switch, on the Digital Vendor Device tab, which allows this to be over-ridden for a specific digital vendor. When over-ridden, all prism requested by the digital calculator (in the KPRVM tag) will be blocked, and no prism will be sent to the generator.
- the tape thickness should be set to 0 (since tape is not used with this blocker)
- the ART blocker flag MUST be set - this causes the interface to accept uploaded data after blocking
...