Printronix MVP Series - Manual (Page 132)

Programming 7–8
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 .
Table 7–3. Number of Dot Positions in a Horizontal Plot Line
Odd or Even Dot Plot High Resolution Plot
Graphics
Mode
Data
Bytes Dot
Positions Data
Bytes Combined
Dots
Positions
Correspondence (Mode 001) 200 1320 440 2640
Data Processing (Mode 002) 132 792 264 1584
Medium Resolution (Mode
003) 137.5 825 275 1650
High Resolution (Mode 004) 159 954 318 1908
High Resolution (Mode 005) 176 1056 352 2112
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.