Plot Data Byte Format - Printronix P3000 Series User's Reference Manual

Plot Data Byte Format

In P–Series Plot Mode, the format is as follows:
Each data byte specifies six out of twelve dot columns.
Using odd dot plot mode, bits 1 to 6 of the data byte address the odd–numbered dot col-
umns; using even dot plot mode, bits 1 to 6 of the data byte address the even–numbered dot
columns.
Bit 6 and/or bit 7 of the data byte must be a "1" (or true) bit in the Plot mode.
Bit 8 of the data byte is not used in the Plot mode and may be either a 1 or 0.
The binary equivalent of the plot data bytes must be known to address specific dot positions
accurately.
As shown in Figure 4–7, a dot is printed at the location addressed by each of bits 1 to 6 in the data byte
that is set (1 or true).
NOTE: Bit order in Figure 4–7 is reversed.
NOTE: BIT 6
AND/OR BIT 7
MUST BE "1"
FOR PLOT MODE
DOT COLUMN
#12 OF PREVIOUS
CHARACTER
COLUMN
Graphics
EVEN DOT PLOT DATA BYTE
LSB
BIT 1 BIT 2 BIT 3
1 0 1
2 4 6
~ ~ ~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ ~ ~
1 3 5
1 1 1 0
BIT 1 BIT 2 BIT 3 BIT 4
LSB
ODD DOT PLOT DATA BYTE
Figure 4–7. P–Series Plot Data Byte Format
BIT 4 BIT 5 BIT 6 BIT 7
0 1 1 0
8 10 12
~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~
7 9 11
1 1 1
BIT 5 BIT 6 BIT 7
MSB
BIT 8
NOT
USED
DOT COLUMN #1 OF
NEXT CHARACTER
COLUMN
NOTE: IN ACTUAL
PRINTING, THESE
TWO ROWS MERGE
TO PRINT ON THE
SAME ROW.
NOT
USED
BIT 8
MSB
4–7