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12.2 Mapping of print data in the print area
Print data is mapped in the print area as follows:
(1) The print area is set by ESC W. When the printer has finished all of the print
and paper feed actions specified before receiving an ESC W, the ESC W sets the
left end (As viewed facing the printer) as the start point (x0, y0) of the print
area. The print area is a rectangle defined by two edges extending from the
start point (x0, y0): one edge running in the x (Horizontal) direction by dx pitch
(Inclusive of the start point), and the other running in the y (Vertical) direction
by dy pitch. (If no ESC W is defined, the default values are used to define the
print area.)
(2) With a print area defined by ESC W and a print direction specified by ESC T,
when the printer receives print data, the print data is mapped in the print area
where point A (See the figure “Mapping Position for Character Data”) is used
as the initial value of the start point. If the print data consists of characters, this
start point serves as the baseline.
If the print data is a downloaded bitmap image or a bar code, the print data is
mapped with its lower-left point “B” aligned to the baseline. (See the figure
“Mapping Positions for Print Data”.)
When attempting to map the HRI characters of a bar code, however, the section
above the standard character height will not be printed.
(3) If print data (Or the space to the right of a character) extends beyond the print
area before a command that involves a line feed (For example, LF or ESC J
command) is received, a line feed is automatically executed in the print area, so
that the mapping position of the print data is moved one line. The next
mapping position will be the beginning of the line. In this case, the line feed
width is as defined by a command such as ESC 2 or ESC 3.
(4) By default, the line feed width is 1/6 inch, which is equivalent to 34 dots. If the
print data for the next line includes a vertically doubled or taller character , a
downloaded bitmap image extending two or more lines, or a bar code taller
than the character height, the data, therefore, falls short of the line feed width,
causing the upper dots of the character to overlap the print data of the current
line. The line feed width needs to be increased.