Printronix MVP Series User Manual page 132

04H — Even Dot Plot
05H — Odd Dot Plot
Plotting allows you to address and print any individual dot position, which
includes printing bar codes bar graphics, halftones, block characters,
schematics and complex curves. Each Plot program line results in a
horizontal print row consisting of up to 220 six–bit dot patterns, depending
on the graphics mode and plot resolution selected as shown in Table 7–3 .
Correspondence (Mode 001)
Data Processing (Mode 002)
Medium Resolution (Mode
003)
High Resolution (Mode 004)
High Resolution (Mode 005)
The dot patterns printed correspond to the received ASCII character code
true or 1 bits. Each printable character has an eight–bit code, and patterns are
obtained using the least significant six–bits of the code. That is, a dot is
printed for every bit set (every 1) in the ASCII code except the seventh and
the eighth or most significant bit (MSB).
Figure 7–1 illustrates the actual data pattern sent. Whereas Figure 7–2 shows
how the printer interprets the data for plotting; the dot pattern progresses
from the left to right with the left dot set by the least significant bit (LSB).
The six bits are assigned to six adjacent columns (odd or even plot) within a
character position. Therefore, bits having a digital value of 1 are printed, and
any digital 0 bit is not printed.
7–8
Table 7–3. Number of Dot Positions in a Horizontal Plot Line
Graphics Data
Mode Bytes
Odd or Even Dot Plot
Dot
Positions
200 1320
132 792
137.5 825
159 954
176 1056
High Resolution Plot
Data Combined
Bytes Dots
Positions
440 2640
264 1584
275 1650
318 1908
352 2112
Programming