Lexmark 248X, 249X manual 149, Is a space module Is a bar module, Barcode Type Value, 248x 249x

k is the barcode type.

Barcode Type	k value
EAN-13	178, xB2
EAN-8	179, xB3
Code 39	180, xB4
Interleaved 2of5	182, xB6
UPC-A	183, xB7
POSTNET	185, xB9
Code 128	186, xBA

m is the module width.

Module is a term defining the smallest unit of measurement within a barcode. The module width, m, is used to determine both bar and space widths.

										Bar Length
										(Height)
			B	A				Width
B is a space module.										A is a bar module.
							248x		249x
		m value					module		module
					# of dots		width		width
	0 (default)					2 dots	0.021 inches		0.015 inches
1						2 dots	0.017 inches		0.012 inches
2						2 dots	0.021 inches		0.015 inches
3						3 dots	0.030 inches		0.021 inches
4						4 dots	0.038 inches		0.026 inches

Note: If m = 1, the human readable character is not printed.

Section 8: Barcodes 149