Compuprint MDP 30FB Programmer's Manual page 110

Code 11 DC4 DC4 ESC ! n 14 p EM
CODE-11 bar code fields do not have a defined format length and contain data
belonging to the following character set: 0 1 2 3 4 5 6 7 8 9 -
Question marks will be printed in place of HRC string otherwise, if possible.
This bar-code type defines a variable WIDE/NARROW ratio. This bar code is
printed at 1/180" horizontal and vertical graphical printing resolution, to ensure
high readability rate. Each digit encodation is separated from the next by a
1/90"-1/60 ", wide default InterCharacter Gap.
CODE-11 has unique START/STOP character; the printer generates the couple
related to each symbol. It is visually interpreted by an OPEN TRIANGLE and
will always appear on the HRC string, because its size is usually varied to
signify the number of check digits being used in the particular symbol:
- SMALL open triangle means ONE check-digit
- LARGE open triangle means TWO check-digit
Due to this, f field is meaningless and always defaults to HRC string print.
108