3. Setting values in commands: Standard Mode vs. Page Mode
(1) Values specified using a command are used in both the Standard and
Page Modes,. with the exception of ESC SP, ESC 2, and ESC 3. For any
of these commands, values are set for each mode individually.
(2) When horizontal tab positions are specified in Page Mode using ESC D,
the positions are set in Standard Mode at first, then the results are
transformed into those suitable for Page Mode. When horizontal tab
positions exceeding one line are specified in Standard Mode using
ESC D, and a horizontal tab command HT is issued when the print
position is at the end of a line, the command is executed at the begining
of the next line. But in Page Mode, the same command sequence
results in feeding a line only.
(3) The maximum number of dots for a bit image is 210 in Standard Mode.
In Page Mode, a bit image with a y direction (i.e. paper feed direction)
length of 480 dots or less can be printed (on condition that the y direction
length of 480 dots has been set using ESC W and print direction value “n”
has been set to 1 or 3 using ESC T).
4. Print data buffering in a printable area
Print data is buffered in a specified printable area using the following
procedure.
(1) A printable area is specified using ESC W. After all the print jobs and paper
feed operations previous to the ESC W are completed, this command
sets the left side (as seen from the printer) as the start position (x0, y0).
A length of dx dots, including x0 in the x direction (perpendicular to the
paper feed direction), and a distance of dy dots, including y0 in the y
direction (i.e. paper feed direction), determine a rectangular printable
area.
When a printable area has been set using ESC W and a print direction
has been set using ESC T, print data received by the printer is buffered
in the printable area so that the top dot of character font (refer to ESC *
explained in Section 6-3 Commands) is located at the top of the printable
area.
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