Unitech MS337 Instrukcja Użytkownika Pobierz pdf (Strona 57)

PREFIXES/SUFFIXES

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 - The

scanner outputs on LRC check character after the

bar code.

³107801

* Disable Transmit of LRC Calculation.

³107800

* Start LRC on First Byte - The scanner will

calculate the LRC check digit starting with the first

character.

³107810

Start LRC on Second Byte - The scanner will

calculate the LRC check digit starting with the

second character.

BLOCK CHECK CHARACTER

* Enable NCR BCC

Disable NCR BCC

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 84 85

Brak uwag

Unitech MS337 Instrukcja Użytkownika Strona 57