CognitiveTPG A798 Instruction Manual download pdf (Page 43)

Chapter 4: Programming Commands 43

Revision C 12/09

A798-PG00001C

Set absolute starting position

ASCII ESC $ nL nH

Hexadecimal 1B 24 nL nH

Decimal 27 36 nL nH

Value of n: n = Number of dots to be moved from the beginning of the line.

nL = Remainder after dividing n by 256.

nH = Integer after dividing n by 256.

The values for nL and nH are two bytes in low byte, high byte word orientation.

Sets the print starting position to the specied number of dots (up to the right margin) from the beginning of the line. The

print starting position is reset to the rst column after each line.

Formulas

The example shows how to calculate 280 dots as the absolute starting position.

28 x 10 = 280 dots (beginning of column 29)

280/256 = 1, remainder of 24

nL = 24 nH = 1

Related information

If the set horizontal and vertical motion units command (1D 50) is used to change the horizontal and vertical minimum

motion unit, the parameters of the set relative print position command will be interpreted accordingly. For more

information, see the description of the command set horizontal and vertical minimum motion units command (1D 50) in

this document.

Compatibility information (A798 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 A798 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.

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 graphics

command.

Set vertical line spacing to 1/6 inch

ASCII ESC 2

Hexadecimal 1B 32

Decimal 27 50

Default: 3.33 mm (0.13 inch)

Sets the default line spacing to 4.25 mm (1/6 of an inch).

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CognitiveTPG A798 Instruction Manual Page 43