Printronix P6000L, User'S Reference Manual

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4-9 Graphics
Plot Data Byte Format
Each data byte specifies six of the twelve dot columns that compose one character column. UsĆ
ing odd dot plot, bits 1 to 6 of the data byte address the odd numbered dot columns; using even
dot plot, 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 can be either 1 or 0.
As shown in Figure 4-9, 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). Consequently, the binary equivalent of the plot data bytes must
be known to accurately address specific dot positions. Table 4-2 presents the binary equivaĆ
lents and resultant dot patterns of the standard ASCII characters.
1 1 1 1 1 1 0
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
ODD DOT PLOT DATA BYTE
LSB MSB
1 3 5 7 9 11
NOT
USED
NOT
USED
0 0 0 1 1 1 1
2 4 6 8 10 12
EVEN DOT PLOT DATA BYTE
BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8
LSB MSB
DOT COLUMN NO. 1
OF NEXT
CHARACTER COLUMN
BIT 7 MUST BE
A 1 FOR PLOT
MODE
BIT 6 AND/OR
NOTE:
DOT COLUMN
NO.12 OF
PREVIOUS
CHARACTER
COLUMN
Figure 4-9. P-Series Plot Data Byte Format