Microscan N2210WZ Owner's Manual page 142

Symbologies
Interleaved 2 of 5
Interleaved 2 of 5 has been popular because it is the most dense symbology for printing
numeric characters less than 10 characters in length; however, Microscan does not recommend
this symbology for any new applications because of inherent problems such as symbol
truncation.
A dense, contimuous, self-checking, numeric symbology. Characters are paired together
so that each character has five elements, two wide and three narrow, representing numbers
0 through 9, with the bars representing the first character and the interleaved spaces
representing the second character. (A check character is highly recommended).
Check Character Status
This option is not typically used, but it can be enabled for additional security in applications
where the host requires redundant check character verification.
An error correcting routine in which the check character character is added.
Check Character Output Status
When enabled, a check character character is sent along with the symbol data for added
data security.
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QX-870 Industrial Raster Scanner User's Manual