Control Codes
Horizontal Color Graphics
The Epic 880TM Printer supports monochrome and color graphics sent as horizontal scan lines. Individual scan lines of graphic data are sent to the printer one line at a time. The Epic 880TM Printer supports only two color printing, however, 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, atleast 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.
[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
1Red
2Green
4Blue
<length> = byte specifying the length of the data including the format byte, ranging from 0 to 254 (255 is reserved for future use.)
<format> = byte specifying the format of the graphics data.
0 for raw data
1 for bit wise RLE compression
8 for byte wise RLE compression
254 for difference compression
255 for same as previous scan line data
<data> = the data bytes that define the graphics to be printed.
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