AMT Datasouth AMTACCEL-5350 User Manual page 195

Table D-3. AMT and Diablo 630 Escape Sequences––continued
Function
Proportional mode
Start ................................
End .................................
ASCII Hexadecimal
Text Functions––continued
ESC P 1B 50
ESC Q 1B 51
Decimal
These sequences start and end the proportional mode,
27 80 wherin the printer spaces characters by moving a specific
27 81 number of PS units (1/120-inch increments), printing the
character, and then moving by the same number of PS
units again.
If the active font is a PS font, the printer uses the PS unit
values prestored in the font. If the active font is a fixed-
pitch font, the printer uses one-half the normal character
spacing as the number of PS units for every character.
PS fonts contain prestored PS unit values for characters.
A PS unit value represents one-half the space, in multiples
of 1/120-inch, that is required to print and space a
character. PS unit values range from 2 to 8. For example,
the letter "V" has a PS unit value of 6, so it prints centered
within a space of 12/120-inch (move 6 PS units, print the
"V", and then move 6 PS units again). Or, the letter "i"
has a PS unit value of 3, so it prints centered within a
space of 6/120-inch (move 3 PS units, print the "i", and
then move 3 PS units again).
To determine the total distance from the center line of one
character to the center line of the next character, just add
the two characters' PS unit values. In the example above,
the distance between the center of the "V" and the center
of the "i" is 9/120-inch.
All numeric characters (0 to 9) have the same PS unit
value. This allows numeric data to be printed aligned in
columnar form without having to turn off proportional
spacing.
During fixed-pitch printing, the printing sequence is
PRINT-MOVE, where the distance of the move is the
current character spacing setting. During PS printing, the
printing sequence is MOVE-PRINT-MOVE, where the
distance of the move is PS units.
After ending proportional mode, character spacing resets
to the default character spacing of the active font. If the
active font is a PS font, character spacing resets to 12
characters per inch.
User's Guide
Description
Code Sets D-17