Dascom T2250 User Guide IGP for Dot Matrix Printers - Manual (Page 49)

Chapter 2: Emulations
49
Plot Density
In Plot Mode, your printer will print in a variety of dot densities, both horizontally and vertically.
The default density in Plot Mode is 100 dots per inch (DPI) in both the horizontal and vertical
directions. To select a different density, use the escape sequence:
ESC [ n1 ; n2 ! q
1B 5B 3B 21 71
Where:
n
1
= Horizontal density in DPI in the range of 40 to 240, scaled to 180 DPI.
n
2
= Vertical density in DPI in the range of 40 to 240, scaled to 180 DPI.
When you change the plot densities, they remain active until the printer is turned off or they are
changed again.
To determine the number of dot patterns necessary to print a full line, multiply the line length by
the horizontal DPI, then divide the total by 6 (each dot pattern = 6 bits).
Example:
If line length = 13.2" and DPI = 100, then
Total dots per line = 13.2 x 100=1320, and
Total dot patterns per line = 1320/6 = 220
Therefore, to print a full 13.2 inch line at 100 DPI you would have to send 220 dot
patterns.
Shading effects can be created by printing different dot patterns in subsequent rows.