Microscan N2210WZ Owner's Manual page 104

Communication
Preamble
Useful for identifying and controlling incoming data. For example, defining the preamble as
a carriage return and a line feed causes each decoded message to be displayed on its
own line.
Preamble Characters
Allows the user to define up to four postamble characters that can be added to the end of
the decoded data
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QX-870 Industrial Raster Scanner User's Manual