Epson A794-D100 - Manual (Page 70)

Chapter 6: Programming Information A794 Owner’s Guide
March 1999 64
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 A794 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.
Select Justification
Specifies the alignment of characters, graphics, logos, and bar codes (see the value of n
table).
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)
Exceptions
The command is valid only at the beginning of a line.