Genicom GEK 00031B User Manual

Page 168

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Chapter 7. Dec LG/Compaq LG Plus Emulation

GEK-00029B

168

SIXEL Sixel Graphics: This sequence provides a group of 6 bit bytes to
be used as vertical graphics data. A bit value of 1 means print a pixel,

while a bit value of 0 means leave a blank. The Device Control String
(DCS) envelope contains the graphics introducer and all graphics data.
This envelope is initiated using the DCS control character and is
terminated with the String Terminator (ST) control character. The Sixel
protocol components are made up of the String Introducer, Protocol
Selector, Picture Data, and String Terminator. The Protocol Selector

consists of a string of 0, 1 or more numeric parameters separated by
the semicolon character (3BH).

The overall command format is the following:

DCS Ps1;Ps2;Ps3Psn q Sixel data ST

The Protocol Selector is that portion of the form:
Ps1;Ps2;Pn3Pn q.
Hex:

90 Ps1 3B Ps2 3B Pn3Pn q <sixel data> 9C

Ps1 selects the horizontal grid size and aspect ratio, this will
implicitly define the vertical grid size. The following table defines the
parameter selections.

Ps1

Horizontal

DPI

Vertical

DPI

Aspect

Ratio

0

100

50

200:100

1

100

50

200:100

2

200

50

400:100

3

200

65

300:100

4

100

40

250:100

5

100

50

200:100

6

67

45

150:100

7

67

55

120:100

8

50

45

110:100

9

50

50

100:100

Ps2 is the background select parameter. It is not used by this printer.
Ps3 selects the horizontal grid size in decipoints. This parameter,
used with the aspect ratio, defines grid size. The following table
identifies the horizontal grid size used for each parameter value.

Ps3

Horizontal

DPI

0

No Change

1

240

2

240

3

240

4

180

5

140

6

120

7

120

8

90

9

90

10

70

11-19

60

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