Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 46)

Chapter 4
Configuring Your Decoder
4–19
Note: If you want more information on how check characters are generated
and what they mean, refer to Appendix F.
HEADER MESSAGE (m) - Refer to Figure 6.5, item #3. You can enter
one of two options:
1) The header message you want sent to a host (Send Header Message
selected). This entry is limited to 32 ASCII characters.
2) Leave field blank (none).
NO-READ MESSAGE (n) - Refer to Figure 6.5, item #8. You can enter
one of two options:
1) The no-read message you want sent with each no-read (Send No-Read
Message selected). This entry is limited to 32 ASCII characters.
2) Leave field blank (none).
Data Check Characters
CODE 39 CHECK CHAR (o) - Selecting YES for this field will enable the
decoder to compute and verify a code check character for Code 39 bar codes.
The code check character ensures that the data is read correctly. If NO is
selected, the decoder will assume that a check character does not exist. Refer
to Figure 6.5, item #9.
Note: The Code 39 check character is computed as a Modulus 43 sum of all
character values as specified in AIM specification USS-39. AIM is an
acronym for Automatic Identification Manufacturers.
SEND CODE 39 CHECK CHARACTER (p) - Selecting YES for this
field will enable the decoder to transmit the code check character with the
bar code data. A code check character will not be sent if NO is selected.
Refer to Figure 6.5, item #9.
I 2-OF-5 CHECK CHAR (q) - Selecting YES for this field will enable the
decoder to compute and verify a code check character for Interleaved 2-of-5
bar codes. The code check character ensures that the data is read correctly.
If NO is selected, the decoder will assume that a check character does not
exist. Refer to Figure 6.5, item #9.
Note: The Interleaved 2-of-5 check character is computed as a Modulus 10
sum of all character values as specified in AIM specification USS-I 2/5.
SEND I 2-OF-5 CHECK CHARACTER (r)- Selecting YES for this field
will enable the decoder to transmit the code check character with the bar
code data. A code check character will not be sent if NO is selected. Refer
to Figure 6.5, item #9.