Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 89)

Chapter 6
Communicating With a Host
6–7
Bar code data is transmitted after the end of trigger or after a valid package
as specified by the RESPONSE MODE you selected as part of the decoder’s
configuration. Bar code data is sent as a string. Figure 6.5 illustrates the
structure of the data. Table 6.A explains the contents of each field in the data
string.
Note: The format of the bar code data is dependent upon the transmission
parameters you entered; some of the fields shown in Figure 6.5 are optional.
Figure 6.5
Data Message Format
* * *
14. Package Count
13. Delimiter
11. Codabar Stop Character
9. Check character
8. ASCII Label Data or No-Read Message
6. UPC Number System Character
5. Code Type
4. Delimiter
3. Header Message
2. Source Identification Data
1. Start Character
* This field contains characters that you program from the setup menus.
Refer to Chapter 4 for more information.
7. Codabar Start Character
* * *
12. Delimiter
10. UPC/EAN Check Digit
15. End Message
16.
Checksum
* *
ASCII BAR CODE DATA
*
NOTE: The presence of fields 1 → 5, 8, 9, and 12 → 16 is determined by the configuration
parameters. The presence of fields 6, 7, 10, and 11 is determined by the bar code.
Message Format