Genicom GEK 00031B - Manual (Page 98)

Chapter 4. Printronix P Series Emulation GEK-00029B 98
PLOT MODE GRAPHICS OPERATIONAL DESCRIPTION
Plot Density
Plot density refers to the number of dots per inch (dpi) printed in a
single dot row. Two types of plot density are available in this
emulation:
▪ Normal density plot mode
▪ Double density plot mode
Normal Density Plot Mode
▪ Selected using the odd dot plot control code ENQ (05 hex) or the
“SFCC e” control sequence.
▪ The odd-numbered dot columns (120 DPI grid) are addressed to
produce a horizontal density of 60 DPI.
Double Density Plot Mode
▪ Selected using the even dot plot control code EOT (04 hex), or the
“ d” control sequence. The even dot mode must be used in
conjunction with the odd dot plot control code ENQ (05 hex) or
“ e” sequence.
▪ The even dots are sent first, followed by the odd dots, allowing a
maximum of 1632 dots in a single dot row at 120 dpi (13.6 inch
line).
▪ The vertical density remains the same as in normal density
plotting.
Plot Mode Format
▪ Each data byte specifies six possible dot columns.
▪ Using 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 (true) bit in the
Plot mode.
▪ Bit 8 of the data byte is ignored in Plot Mode; it can be either 1 or
0.
▪ The binary equivalent of the plot data bytes must be known in
order to accurately address specific dot positions.