Vision systems for manufacturing and industrial use, the vision systems each including computer software for operating the system and one or more camera assemblies, namely, optical scanners; machine-vision systems for reading single-dimensional and multidimensional barcodes on printed circuit boards and printed-circuit-board arrays, the machine-vision systems each including computer software for operating the system, one or more camera assemblies, and one or more illuminating assemblies, namely, optical scanners; machine-vision systems for reading single-dimensional and multidimensional barcodes on printed circuit boards as the printed circuit boards traverse a printed-circuit-board assembly line, the machine-vision systems each including computer software for operating the system, one or more camera assemblies, and one or more illuminating assemblies, namely, optical scanners; machine-vision systems for reading single dimensional and multidimensional barcodes on printed-circuit-board arrays as the printed-circuit board arrays traverse a printed-circuit-board array assembly line, the machine-vision systems each including computer software for operating the system, one or more camera assemblies, and one or more illuminating assemblies, namely, optical scanners; printed or electronic user manuals sold as a unit with machine-vision systems