Dascom T2250 User Guide IGP for Dot Matrix Printers - Manual (Page 30)

IGP for Dot Matrix Printers User Guide
30
Page Formatting
Many of the parameters for formatting the print and page characteristics (such as LPI, Horizontal
Tabs, etc.) can be set from your host computer using escape sequences. This section discusses
and explains the Escape Sequences and Reserved Control Codes used for page formatting.
Lines Per Inch
The following escape sequence selects lines per inch (LPI):
ESC [ n z
1B 5B 7A
Where:
n = one of the values from the table below.
LPI n Value
Selection ASCII HEX
1.5 LPI 7 37
2 LPI 8 38
3 LPI 9 39
4 LPI 10 3130
5 LPI 11 3131
6 LPI* 3 33
7 LPI 12 3132
8 LPI 4 34
9 LPI 13 3133
10 LPI 6 36
11 LPI 14 3134
12 LPI 15 3135
15 LPI 16 3136
*Default LPI value
Figure 9 – LPI Selections
The LPI may be changed anywhere on a form. The current LPI setting is used to compute the
physical form length when loading a VFU or selecting a form length. Changing the LPI does not
change the physical form length, bottom-of-form skip, vertical tab stops, or VFU channel
positions. However, it does change the size of the units by which they are set and reported. For
example, an 11 inch form at 6 LPI has 66 lines, but the same form length has 88 lines at 8 LPI.
Variable Line Spacing
You may set up these emulations to use variable line spacing in increments of n/720". To set up
variable line spacing, use the sequence:
ESC [ < n Sp h space required before h
1B 5B 3C 20 68
Where:
n = Desired line spacing in increments of n/720".