Set Relative Print Position - CognitiveTPG A799 Programming Manual

48 Chapter 4: Programming Commands

Set relative print position

ASCII
ESC \ n1 n2
Hexadecimal
1B 5C n1 n2
Decimal 27 92 n1 n2
Value of n:
To move the relative starting position right of the current position:
n = Number of dots to be moved right of the current position
n1 = Remainder after dividing n by 256
n2 = Integer after dividing n by 256
The values for n1 and n2 are two bytes in low byte, high byte word orientation.
To move the relative starting position left of the current position:
n = Number of dots to be moved left of the current position
n1 = Remainder after dividing (65,536-n) by 256
n2 = Integer after dividing (65,536-n) by 256
The values for n1 and n2 are two bytes in low byte, high byte word orientation.
Moves the print starting position the specified number of dots either right (up to the right margin) or left (up to the left
margin) of the current position. The print starting position is reset to the first column after each line.
Formulas
To move to the left:
Determine the value of n by multiplying the number of columns to move left of the current position by 10 (standard) or
8 (compressed) pitch. The example shows how to set the relative position two columns in standard pitch (10 dots per
column) to the left of the current position.
2 x 10 = 20 dots (two columns to be moved left of the current position)
65,536–20 = 65516
65,516/256 = 255, remainder of 236
n1 = 236, n2 = 255
To move to the right:
Determine the value of n by multiplying the number of columns to move right of the current position by 10 (standard)
or 8 (compressed) pitch. The example shows how to set the relative position two columns in standard pitch (10 dots per
column) to the right of the current position.
2 x 10 = 20 dots (two columns to be moved left of the current position)
20/256 = 0, remainder of 20
n1 = 20, n2 = 0
Related information
If the set horizontal and vertical minimum motion units command (1D 50) is used to change the horizontal and vertical
minimum motion unit, the parameters of this command (set relative print position) will be interpreted accordingly. For
more information, see the description of the set horizontal and vertical minimum motion units command (1D 50) in this
document.
Compatibility information (A799 receipt vs. A793 receipt)
There is a difference in the normal behavior of this command in A793 emulation mode as compared to the original A793.
The difference exists when the command is used to move to the left. The A793 processes the whole print string prior to
putting it in the buffer for the print head. This method of processing allows the A793 to backup in the print string and
replace characters and their associated attributes when a "Set relative print position" command instructs the printer to
move the print position to the left.
In order to improve the speed of printing, the A799 moves the data into a buffer for the printhead when it receives it.
When the "Set relative print position" command contains a move to the left, this causes the new data to overstrike the
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A799-PG00001D
Revision D 12/09