Compuprint 10200 Programmer Manual - Manual (Page 95)

Commands
91
UPC-E DC4 DC4 ESC! n 4 p EM
If 11-digit strings will be received and o check digit field is missing or takes
values 0 or 2, question marks will be printed in place of HRC string, when
possible; if o field takes value 1, the 12th digit is inserted by the printer as
result of the internally available algorithm applied to the received string.
If 10-digit strings will be received and o check-digit is missing or takes NULL
value, question marks will be printed in place of HRC string, if possible; if o field
takes value 1, a default 0 System-Digit will be automatically inserted by the
printer and the 12th digit will also be inserted as result of he internally
available algorithm applied to the final string.
If the final UPC-A string cannot be compressed to an 8-digits string or the
received System-Digit is different than 0 or 1, question marks will be printed in
place of HRC string, if possible.
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.