Genicom GEK 00031B PLOT MODE GRAPHICS OPERATIONAL DESCRIPTION

Chapter 4. Printronix P Series Emulation GEK-00029B

PLOT MODE GRAPHICS OPERATIONAL DESCRIPTION

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

▪ 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.

▪ Selected using the even dot plot control code EOT (04 hex), or the

“<SFCC> d” control sequence. The even dot mode must be used in

conjunction with the odd dot plot control code ENQ (05 hex) or

“<SFCC> 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.

▪ Each data byte specifies six possible dot columns.

▪ Using odd dot plot, bits 1 to 6 of the data byte add ress 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) bi t in the

Plot mode.

▪ Bit 8 of the data byte is ignored in Plot Mode; i t can be either 1 or

▪ The binary equivalent of the plot data bytes mu st be known in

order to accurately address specific dot positions.