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A redstone comparator's block data specifies its orientation, mode, and powered status.

Bits Values
A two-bit field storing a value from 0 to 3 specifying the redstone comparator's orientation:
  • 0: Facing north.
  • 1: Facing east.
  • 2: Facing south.
  • 3: Facing west.
0x4 Set if in subtraction mode (front torch up and powered).
0x8 Set if powered (at any power level).