CognitiveTPG B780 - Manual (Page 62)

Chapter 5: Programming commands 50
A776 (B780) Programming Guide A776-PG00001 C 12/09
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 by n dots:
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 by n dots:
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 (slip
or receipt standard pitch) or 8 (receipt 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 (slip
or receipt standard pitch) or 8 (receipt 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 (A776 receipt vs. A756 receipt)
There is a difference in the normal behavior of this command as compared to the original A756. The difference
exists when the command is used to move to the left. The A756 processes the whole print string prior to putting it
in the buffer for the printhead. This method of processing allows the A756 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 A776 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 previous data. This behavior can be used to an application’s advantage to provide the ability to create compound
characters on the receipt station.