Star Micronics Rainbow NX-1000C User Manual page 54

Double and quadruple density give finer detail than normal density,
but require two and four times as much data, respectively. The high speed
in fast double density is attained by skipping every other dot; this mode is
for debugging use.
DOWNLOADING CHARACTERS
When you need a special symbol that is not in any of the printer's
character sets, you do not have to resort to hand lettering; you can define
the symbol and substitute it for a character of your choosing. The technique
is similar to dot graphics. In draft mode, a character is defined by a matrix
8 dots high and 11 dots wide. Figure 3-3 shows the dot matrix for a draft
character representing a car. Note that there are no horizontally adjacent
dots. The print head is travels too fast to print adjacent dots in the horizontal
direction.
ml m2 mJ m4 m5 m6 m7 m8 m9 mJO ml I
128
64
•
• •
32
•
•
16
•
• •
8
•
•
4
•
• •
•
2
• •
Dot
data
124
0
66 4 64 36 16 2 16 12
0
Figure 3-3. Car symbol, draft quality
ASCII Code
33
Descender I
SIan column
0
End column
I I
mO
=
Descender
x
128
+ (SIan
x
16)
+
End
To download and use this character, you should:
1. Select draft mode (if not already selected) with the < 27 > < 120 >
< 48> command.
2. Copy the printer's regular character set into download character memory
with the < 27 > < 58 > < 0 > < 0 > < 0 > command.
3. Replace one of the characters with new dot data with the < 27> < 38 >
< 0 > < n > < n > < rnO > < ml > < m2 > ... < mIl> command, where
n is the character code, mO is an attribute byte and ml to mIl are the
dot data.
4. Select the download character set with the < 27 > < 37 > < 49 >
command.
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