Number of dots for each paper width

Some methods require paper width in dots(e.g.ICommandBuilder.appendBitmap).

The number of dots to be specified depends on the printer model and the paper width.
Here is a general indication.

Thermal printer

Paper width	Dots
2-inch	384
2-inch (Sanei SK1)	432
3-inch	576
3-inch (BSC10)	512
4-inch	832

Dot impact printer

Paper width	Dots
3-inch	210