Compuprint MDP40B Programmer Manual - Manual (Page 121)

B-14
CODE GP DC4 DC4 ESC ! n 10 p EM
CODE-GP bar code allows bar codes to be constructed from the two basic
elements (BAR and SPACE) by sending 0,1 digits: digit 0 produces a BAR
and digit 1 produces a SPACE.
These two elements may be combined in any sequence, thus giving the
possibility of producing bars and spaces of any width that is a multiple of the
basic element width. Default bar/spaces width is 1/60” (q = 0,1) but these
values may be set by the user according to its specific needs. Data fields do
not have a defined format length and contain 0,1 data only; question marks
will be printed in place of HRC string otherwise, if possible.
No Human Readable Interpretation is possible, hence is the user task to
provide a TEXT STRING below or above the bar/space symbol: f field is
meaningless. No internal check digit algorithm is available: o field is
meaningless.
C25-3BAR DC4 DC4 ESC ! n 11 p EM
C25-3BAR bar code data fields do not have a defined format length and
contain numeric data only: question marks will be printed in place of HRC
string otherwise, if possible. If o check digit option field takes 1 value, an
internally generated check digit complying with general 2/5 family algorithm
will be added to the encoded string: however it will not show on the required
HRC string.