Compuprint MDP 30FB, Programmer'S Manual

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LEFT and RIGHT delimiters, the System-Digit and the Check-Digit will be
printed as descending bars to make a field to host a 6-digits HRC string and the
System-Digit HRC to the left of LEFT delimiter (at about the middle of the
symbol) when f field is missing or set to 1; in this case, the Check-Digit will show
in HRC to the right of the RIGHT delimiter (at about the middle of the symbol),
when o field takes values 2 or 3: it will never show on HRC string otherwise.
UPC-EAN 2 DC4 DC4 ESC! n 5 p EM
ADD ON-2 bar code data fields contain numeric data only: question marks will
be printed in place of HRC string otherwise, if possible.
If 3-digit strings will be received within a DC4 DC4 ESC (... EM control sequence
and o check-digit option field is missing or takes NULL value, the symbol will
encode the first 2 digits and the 3
rd
received digit will be used as check digit, even
though this may affect its readability; if o field takes 1 value, the 3
rd
digit is
matched versus the internally generated check-digit an question marks will
printed in place of HRC string when mismatching, if possible.
If 2-digit strings will be received and o check digit field is missing or takes NULL
value, question marks will be printed in place of HRC string, when possible; if o
field takes value 1, the check digit will be computed applying the internally
available algorithm to the received string in order to properly encode the symbol.
If f field is missing or takes value 1, the 2-digits HRC string will be printed above
the Bar/Spaces symbol and its height will be part of the overall symbol’s height;
the check-digit will never show on HRC string. If f field takes value 0, the
symbol’s encoding will print at full height.