Compuprint MDP40B Programmer Manual - Manual (Page 122)

B-15
Code BCD DC4 DC4 ESC ! n 12 p EM
CODE-BCD 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. No internal check digit algorithm is available for
this standard: o field is meaningless.
MSI Plessey DC4 DC4 ESC ! n 13 p EM
MSI bar code data fields do not have a defined format length and must
contain numeric data only: question marks will be printed in place of HRC
string otherwise, if possible. To releaf the host from calculating MSI check
digits, internal algorithms are provided that are accessible by the host
application program giving the proper supported value to o check-digit option
field, according to the following options:
0 Print the bar code symbol with no
printer-generated check digits
1 Print the bar code symbol with IBM
Modulus-10 check digit -generated
by the printer and put at the end of
the numeric string: this will be the
2
nd check digit, the 1 st check digit is
IBM Modulus-10 also.
5 Print the bar code symbol with
both check digits generated by the
printer and put at the end of the
data. The 2
nd check digit is IBM
Modulus-10, the 1 st check digit is
the complement to 11 of NCR
Modulus-11 algorithm applied to
the received string: if the modulus
is 0 or 1 check digit is 0.