CognitiveTPG A798 Instruction Manual download pdf (Page 23)

Chapter 3: Programming the Printer 23

Revision C 12/09

A798-PG00001C

Chapter 3: Programming the Printer

Overview of commands

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 identied 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.

Comparison to A793

The following table details the list of commands whose behavior differs between the A793, A794, and A798 because of the

physical differences of a 6 dots/mm head (A793) versus an 8 dots/mm head (A794 and A798).

Command Description Dierence between previous product

and new product emulation mode.

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] Dene user-dened character set Since the dots on the A798 printhead are smaller, user

dened characters that were used on the previous printers

will appear smaller on the A798 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 A798

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

spacing will not exactly match the requested spacing.

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CognitiveTPG A798 Instruction Manual Page 23