Allen-Bradley Series B

Chapter 5
Programming Via Escape Sequences
5–12
Mandatory Check Character
The following bar codes have a mandatory check character. The decoder
will always verify the check character.
• UPC/EAN
• Code 128
• Code 11 (1 or 2 check characters)
Undefined Check Character
The following code has no defined check character.
• Codabar
Verifying Check Character
If check character verification is enabled and the check character cannot be
verified, the bar code symbol will be ignored. If no–read recognition is
enabled, a no–read message will be transmitted.
Whenever check character verification has been disabled, bar code symbols
will be read and decoded characters will be transmitted (regardless of
whether or not check characters are present).
Transmitting Check Character
Whenever check character verification is enabled for Code 39 and
Interleaved 2 of 5, the transmission of the verified check character may be:
• Deleted from the message
• Transmitted as a data character along with the decoded data
This option applies to both symbologies only if check character verification
is enabled.
The table below lists the codes with the mandatory check characters and
indicates whether the check characters are transmitted.
Code Transmit check characters?
UPC A
UPC E
UPC E Expanded to UPC
A
EAN 8
EAN 13
CODE 128
CODE 11
Yes
No
Yes
Yes
Yes
No
Yes