TransAct Technologies ITHERM 280 - Manual (Page 129)

iTherm ® 280 Programmer’s Guide Programming Codes
28-07764 Rev C Page 127
Horizontal Graphics (Color Graphics)
The iTherm
® 280 Printer supports graphics sent as horizontal scan lines. Individual scan lines of
graphic data are sent to the printer one line at a time. Although the iTherm ® 280 Printer only
supports two colors, the horizontal graphic command interface gives full color support for printer
graphics. Full color support is provided to establish a full color standard for future printers. Color
data is sent in one of three color planes. Typically, a red plane or scan line is sent, then green
and blue. The sequence of lines defines one row of dots that is printed on the paper.
The horizontal graphic commands do not include resolution information. Therefore, only once
before sending graphics data, set the graphics resolution by sending the [ESC] * command with
a zero length (no data). The graphic resolution sets the internal graphic mode of the printer. The
printer stays in graphic mode until it is changed by another command. Note that the bar code
generation and other graphic commands change graphics mode. The format of the horizontal
graphic command follows.
For additional information on color graphics, see Chapter 7, “Color Graphics.”
[ESC] h Process horizontal graphics data
ASCII
[ESC] h <color> <length> <format> <data>
Hexadecimal 1BH 68H
Decimal
<27> <104>
IPCL None
EPOS None
Description The [ESC] h <color> <length> <format> <data> command processes horizontal
graphic data, where <color> is a byte that specifies the color of the data being
sent.
<color> = 0 Use Previously Selected Color
1 Red
2 Green
4 Blue
Note 1: Red, green, and blue pixels set to one at the same location result
in a white dot, while red, green, and blue pixels set to zero form a black
dot. For black print, one represents a black dot and zero represents a
white dot.
Note 2: More than one color may be set at a time – for example, setting
the color to six would set green and blue simultaneously.
<length> = byte specifying the length of the data including the format byte, ranging from 0 to
254 (255 is reserved for future use.)