Code CR1021 Specifications download pdf (Page 49)

OPTICON Universal menu book

U42

3.2. Setting of number of characters

If you are going to read bar codes of known

length, it is recommended to set the reader for

a fixed number of characters. This can be done

for up to two lengths. The reader uses this to

verify that labels read are of the correct length,

rejecting any labels which do not have the

specified length. The advantage of setting a

fixed length, is that it provides protection

against short scans of labels, such as

Interleaved 2of5, which do not provide sufficient

security against partial scan. The length

checking is done on the label data and is not

affected by options such as (not) transmit start/

stop character or check digit. Setting the

number of characters does not affect fixed

length codes, such as EAN-13. 2D

symbologies such as PDF417 and Data Matrix

are also not affected by fixed length settings.

The following options are available:

Fixed length OFF all codes.

This option cancels the fixed length checking.

Fixed length ON all codes.

This option enables the fixed length checking.

Two fixed lengths are programmed which will

affect all variable length codes. This is done by

reading the following labels:

<SET>

a bar code with the required length,

a second bar code with the required length

(this may be the same length as the first one)

<END>

See figure 3.06.

Enable all 1D codes

BCM

_BCM_

Enable all 2D codes

BCN

_BCN_

Disable all

_B0_

SET

_ZZ_

END

_ZZ_

Fig. 3.06. Setting Fixed length ON

all codes

SET

Fixed length ON

Scan a bar code

with the required length

Scan a 2nd bar code

with the required length

END

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Code CR1021 Specifications Page 49

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