Genicom GEK 00031B Programmer's Manual page 168

Chapter 7. Dec LG/Compaq LG Plus Emulation
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 ; Ps3 ... Psn q Sixel data ST
The Protocol Selector is that portion of the form:
Ps1 ; Ps2 ; Pn3 ... Pn q.
90 Ps1 3B Ps2 3B Pn3 ... Pn q <sixel data> 9C
Hex:
Ps1 selects the horizontal grid size and aspect ratio, this will
implicitly define the vertical grid size. The following table defines the
parameter selections.
Horizontal
Ps1 DPI
0 100
1 100
2 200
3 200
4 100
5 100
6 67
7 67
8 50
9 50
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
0
1
2
3
4
5
6
7
8
9
10
11-19
Vertical Aspect
DPI Ratio
50 200:100
50 200:100
50 400:100
65 300:100
40 250:100
50 200:100
45 150:100
55 120:100
45 110:100
50 100:100
Horizontal
DPI
No Change
240
240
240
180
140
120
120
90
90
70
60
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GEK-00029B