Cognitive Solutions A799 Select justification, Set left margin, Range of n Default, GS L nL nH

Revision D 12/09 Chapter 4: Programming Commands  49

previous data. This behavior can be used to an application’s advantage to provide the ability to create compound characters on the receipt station.

This command also functions differently in the A793 emulation when used in graphics:

n x 2 = Number of dots to be moved from the beginning of the line when this command is followed by a graphic command.

Select justification

ASCII	ESC a n
Hexadecimal	1B 61 n
Decimal	27 97 n
Value of n:	0, 48	= Left aligned
	1, 49	= Center aligned
	2, 50	= Right aligned
Range of n:	0–2, 48–50
Default:	0 (Left aligned)

Specifies the alignment of characters, graphics, logos, and bar codes on the receipt station according to the above table.

Related information

On the LEGACY emulation printer, this command is valid only at the beginning of a line.

Range of n on A793 is 0–255 using low 2 bits only:

00	left aligned
01	center

10right aligned

11center

Set left margin

ASCII	GS L nL nH
Hexadecimal	1D 4C nL nH
Decimal	29 76 nL nH
Range of nL:	0–255
Range of nH:	0–255
Default:	576 dots (the maximum printable area)
Formulas

Sets the left margin of the printing area. The left margin is set to ((nH X 256) + nL) times horizontal motion unit) inches. The horizontal motion units are set by the set horizontal and vertical minimum motion units command (1D 50), described in this manual.

The width of the printing area is set by the set printing area width command (1D 57), which follows this command. See the set printing area width command in this document for a description of that command.

If the setting exceeds the printable area, the maximum value of the printable area is used. The maximum printable area is 576 dots. See the illustration.

To set the left margin to one inch at the default horizontal motion unit of 1/203 inches, send the four-byte string:

GS L 203 0

Or, to set the left margin to two inches at the default horizontal motion unit of 1/203 units per inch, send the four-byte string:

GS L 150 1

Where 2 inches = 406/203, and 406 = (1 X 256) + 150.

Exceptions:

The command is effective only at the beginning of a line. This command is ignored if the line buffer is not empty.

A799-PG00001D