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For high density plot, the even dot plot and odd dot plot control codes, EOT (04 hex) and
ENQ (05 hex), respectively, are used in conjunction with two data lines. The even dot
plot control code is sent with the first data line along with line terminator. The line termi
nator (as above) causes the contents of the buffer to be plotted in the even dot columns
but does not advance the paper. The printer waits for the second line of data using the
odd dot plot control code and a line terminator. If a line feed control code is used as the
line terminator of the second line, data in the buffer is plotted in odd dot columns of the
same row where even dot column data was just plotted, paper is advanced one dot row (at
the vertical density of the current mode), and the printer defaults to the previously se
lected print mode. If a form feed is used as the line terminator of the second data line, the
same action occurs except the paper is advanced to the top of the next form rather than
one dot row.
Control Codes other than those specified in Figure 4-4 intermixed with a line of plot
data may cause unexpected printer output.
PLOT MODE
05 HEX =
NORMAL
DENSITY PLOT
OR
04 HEX + 05 HEX =
HIGH
DENSITY PLOT
When returning to the print mode from P-Series plot mode, an extra line feed should be
included in the data stream to maintain proper line registration throughout the page. If
the extra line feed is not included, the first character line after the graphics data may be
truncated, as shown in Figure 4-5.
A control panel selection (Modified Plot) makes it possible to have the next line of text
placed on the page as if the current line spacing had been followed while plotting (dis
abled); or, the next line of text may be started on the dot row following the last dot row of
plot (enabled).
P9012 Graphics
1st CHAR
2nd CHAR
3rd CHAR
0011111
1111111
BIT 1
BIT 1
BIT 6
Figure 4-4. Plot Data Line Format
132nd CHAR
1100001
0000111
BIT 6
LINE TERMINATOR
0A HEX=
LINE FEED
OR
0C HEX=
FORM FEED
4-5
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