Printronix P3000 Series - Manual (Page 71)

4–9 Graphics
DOUBLE DENSITY PLOT
For double density plot, the plot line contains: Control Code 04 hex, plot data bytes, a Line Terminator
(0A hex or 0C hex), Control Code 05 hex, plot data bytes, and a Line Terminator. The control sequence
for sending P–Series Double Density Plot is as follows:
1. Send the even dot plot control code EOT (04 hex), followed by plot data bytes. (Refer to Table
4–1 on page 4–11.)
2. Send a line terminator, which causes the printer to plot the data bytes. The paper is not advanced
in Double Density Plot; the printer now waits for the second plot command and plot data bytes.
3. Send the odd dot plot control code ENQ (05 hex) and a second line of data, followed by a line
terminator.
a. A line feed (0A hex) used as the line terminator plots the contents of the buffer and advances
the paper a single dot row, based on the vertical density of the current mode. A CR (if CR =
CR + LF is configured) may also be used with the same result.
b. A form feed (0C hex) used as the line terminator plots the data bytes and advances the paper
to the top of the next form.
4. Regardless of which line terminator code is sent, the printer defaults to the previously selected
print mode unless further plot control codes are provided with the data.
NOTE: Failure to adhere to this format may cause unexpected results.
Plotting the Data
P–Series Plot Mode plots the image from the horizontal bit pattern. Figure 4–8 duplicates the pattern
shown in Figure 4–4 but is modified for Odd Dot Plot. Eight dot rows are required, two characters per
row, six columns per character. (The dots required to produce the pattern are shown Figure 4–9 on page
4–10.)
1
2
3
4
5
6
7
8
1 3 11 5 7 9 1 3 11 5 7 9
1st
CHARACTER
ODD COLUMNS
2nd
CHARACTER
ODD COLUMNS
1st
CHARACTER
ASCII DECIMAL
2nd
CHARACTER
ASCII DECIMAL
42
73
92
42
73
92
42
73
*
|
\
*
|
\
*
|
64
65
64
64
65
64
64
65
@
A
@
@
A
@
@
A
DOT
ROW
Figure 4–8. Odd Dot Plot Pattern Plan