Chapter 6: Programming Information | A794 Owner’s Guide |
Compatibility Information (A794 receipt vs. A793 receipt)
There is a difference in the normal behavior of this command in A794 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 A794 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 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: | ||
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 Epson
On the A793 this command accepts any n ≤ 255, using the low 2 bits:
00left aligned
01center
10right aligned
11center
76 | December 1999 |
