Opticon XPT 3125 Universal menubook - Manual (Page 53)

OPTICON Universal menu book
U46
3.3. Setting code specific options
Code specific options may be configured
affecting:
• enabling and disabling code variants and
translations, such as EAN-128, as were listed
in the relations table for setting of readable
codes
• data verification such as by means of a check
digit calculation. A check digit has a value
that can be calculated from the other data
characters and is usually the last data
character in a bar code
• pre-editing of the data string such as
removing the check-digit and/or start/stop
characters
The more common options are described here:
Check CD:
This option enables the check digit calculation.
If the calculated check digit does not
correspond to the check digit in the bar code,
then the bar code is ignored. The use of a
check digit greatly improves the security of a
bar code.
Not check CD:
This option disables the check digit calculation.
This option is required when the bar codes do
not contain a check digit or contain an invalid
check digit.
Transmit CD:
This option enables the transmission of the
check digit together with the data characters.
If the check digit calculation is disabled, the
reader can not differentiate anymore between a
(valid) check digit and a data character. It will
therefore transmit all data characters of the
label, including what could constitute a check
digit.
Not transmit CD:
This option disables the transmission of the
check digit. If the check digit calculation is
disabled, the reader can not differentiate
between a (valid) check digit and a data
character. It will therefore transmit all data
characters of the label, excluding the character
that could constitute the check digit for the type
of bar code.
Transmit ST/SP:
This option enables the transmission of the
start and stop characters of a bar code.
Not transmit ST/SP:
This option disables the transmission of the
start and stop characters of a bar code. The
next figure summarizes the effect of the
transmit options for a Code 39 label with:
• start and stop characters '*'
• data characters '1 2 3 4 5 6'
• or data characters '1 2 3 4 5' and check digit
'6'
Note that because '6' is, according to the Code
39 specifications, not a valid check digit for this
label. The check digit calculation must therefore
be disabled in order for the label to be
accepted.
See figure 3.11.
Fig. 3.11. Setting code specific options
Transmit ST/SP
Not transmit ST/SP
Transmit CD
* 1 2 3 4 5 6 *
1 2 3 4 5 6
Not transmit CD
* 1 2 3 4 5 *
1 2 3 4 5