Printronix P9000 Series, User'S Reference Manual

Page: 76 / 334

Graphics 4-8
Plot Data Line Format
A plot data line may contain any number of plot data bytes up to the maximum of 132 for horiĆ
zontal dot density of 60 dpi (Data Processing mode) or 198 bytes for a horizontal dot density of
90 dpi (Correspondence mode). If Auto Line Feed is disabled, any bytes over the maximum are
lost. If the maximum is exceeded and Auto Line Feed is enabled, a Line Feed (LF) is forced and
the remaining plot data is printed as text on the next line.
The plot mode control code may occur anywhere in the line prior to the line terminator, but
plot speed may decrease if it is not at the beginning of the line.
NORMAL DENSITY PLOT
For normal density plot, the plot line contains: Control Code 05 hex, plot data bytes, and a Line
Terminator (0A hex or 0C hex). The control sequence for sending the P-Series Normal DensiĆ
ty Plot is as follows:
1. Send the plot command code ENQ (05 hex).
2. Send the plot data bytes (refer to NO TAG on page NO TAG).
3. Send a line terminator, either a Line Feed (LF, 0A hex) or a Form Feed (FF, 0C hex). A
Carriage Return (CR) may also be used instead of the LF code, provided the Carriage
Return has been configured for Carriage Return = Carriage Line Feed (CR =
CR + LF).
a. A line feed (0A hex) used as the line terminator causes the contents of the buffer to
be plotted and the paper advances a single dot row , based on the vertical density of
the current mode.
b. A form feed (0C hex) used as the line terminator causes the contents of the buffer to
be plotted and the paper to advance to the top of the next form.
4. Regardless of which line terminator code is sent, the printer will default 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.
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
NO TAG on page NO TAG).
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.