Data Transmission Format; Transmit Lrc Checksum - Allen-Bradley 2-D User Manual

2-d hand-held bar code scanners

Table of Contents

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Data Format Options (continued)

Data Transmission Format

You can specify whether or not the prefix and/or suffix is added to

decoded bar code data. The options are listed below.

<Data>

The prefix and suffix are user defined. For example, the prefix [ and

suffix ] are defined for bar code data. To send the decoded bar code

data with the prefix only, scan these labels:

–

Scan This Symbol First

–

–

Scan Enter After Selecting Option

When enabled, this option appends an LRC checksum character at

the end of a decode transmission. The default is disabled.

With LRC Checksum enabled, the format of the output data is:

If <DATA . . . > contains the special characters STX, ETX, and DLE,

the DLE character is used as an escape character and is added before

each of those characters so that the receiving side knows not to

interpret the special characters in the data as control characters.

The LRC character is the exclusive OR of all characters except for

the LRC character itself.

Publication 2755-6.4

Configuring the Scanner

Sends only bar code data.

Sends bar code data with a prefix

Sends bar code data with a suffix

Sends bar code data with a prefix and suffix

<STX> <DATA . . . > <ETX> <LRC> .

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