Microscan N2210WZ Owner's Manual page 87

Scanner Parameters
Protocol Selection
In general, the point-to-point protocols will work well in most applications. They require no
address and must use RS-232 or RS-422 communication standards.
Protocols define the sequence and format in which information is transferred between the
scanner and the host, or in the case of Multidrop, between the scanners and a concentrator.
Note: In all protocol modes, the Preamble and Postamble character strings can be used
to frame the decoded data, and both are included in calculating the LRC (Longitudinal
Redundancy Check).
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QX-870 Industrial Raster Scanner User's Manual