Metrologic MS9520 Voyager User Manual download pdf (Page 62)

PREFIXES/SUFFIXES (CONTINUED)

LONGITUDINAL REDUNDANCY CHECK

A Longitudinal Redundancy Check (LRC) is an error checking character that is

calculated across a sequence of data characters. It is determined by eXclusive

ORing (XOR) the characters to be checked, starting with an initial value of 00H.

The result, an “LRC byte” is then transmitted following the data stream and used

by the receiving computer to determine if the information was received correctly.

In the scanner’s case, XOR is performed prior to adding parity bits.

When the LRC is enabled, the scanner defaults to starting the LRC on the

second byte of information transmitted. Optionally, the calculation can start on

the first byte transmitted.

³107811

Enable Transmit of LRC Calculation.

With this option, the scanner outputs on LRC

check character after the bar code.

³107801

* Disable Transmit of LRC Calculation.

Will not output on LRC (check character) after

the bar code.

³107810

Start LRC on Second Byte.

The scanner will calculate the LRC check digit

starting with the second character.

³107800

* Start LRC on First Byte.

The scanner will calculate the LRC check digit

starting with the first character.

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 107 108

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Metrologic MS9520 Voyager User Manual Page 62