One belt, four jobs: presence and registration at the eye, identification at the scanner, position tracking by the encoder, and the divert. The crossed-out inset is the never-angle rule.
A label in a known orientation at a known point. The default when you control how it faces.
Reads any of several faces at once, when you can't guarantee orientation.
Damaged or unoriented labels, OCR characters, or package condition.
Weight in motion for a routing call or reject; length, width, height for cubing and envelope checks.