Cognitive Solutions A799 Manual De Usuario

Chapter 3: Programming the Printer

 23

Revision D 12/09

A799-PG00001D

Commands control all operations and functions of the printer. This includes selecting the size and placement of characters 
and graphics on the receipt to feeding and cutting the paper. The programming commands have been organized, in order of 
hexadecimal code within functional groups. For this reason, “related” commands may not be listed adjacent to one another.
The operation of various printers may be emulated by the commands, including the following:
•  A793
•  A794
•  LEGACY 
Any of the commands may be used in any combination to program a host computer to communicate with the printer 
(unless otherwise noted).
Some commands listed and described here may not be implemented and are identified as “not implemented.” If received, 
they are ignored and not sent to the print buffer as data. 
Any nonlegal commands have their parameter sent to the print buffer as data.

The following table details the list of commands whose behavior differs between the A793, A794, and A799 because of the 
physical differences of a 6 dots/mm head (A793) versus an 8 dots/mm head (A794 and A799).

15 n 

Feed n dot rows 

This command will move the paper on the receipt in  

 

 

n/203 inch steps instead of n/152 inch steps.

16 n 

Add n extra dot rows 

The dot rows will be measured in n/203 inches versus  

 

 

n/152 inches.

1B 20 n 

Set right-side character spacing 

This command sets the right side spacing to “n” horizontal  

 

 

motion units. By default, these units are in terms of 1/203  

 

 

inches versus 1/152 inches.

1B 24 n1 n2 

Set absolute starting position 

For graphics commands, the position is scaled to best  

 

 

match A793. In text mode, the equivalent character  

 

 

position is calculated.

1B 26 s c1 c2 n1 d1...nn dn]  Define user-defined character set  Since the dots on the A799 printhead are smaller, user  
 

 

defined characters that were used on the previous printers  

 

 

will appear smaller on the A799 printer.

1B 2A m n1 n2 d1...dn 

Select bit image mode 

In A793 emulation mode, graphics are scaled to best  

 

 

match the size of the graphic in the A793 printer.

1B 33 n 

Set line spacing 

This command uses n in terms of n/360 inches. Since the  

 

 

A793 had a fundamental step of 1/152 inch and the A799  

 

 

has a fundamental step of 1/203 inch, the actual line  

 

 

spacing will not exactly match the requested spacing.