A value of 1 will write optional checksums, and a value of 0 will not write optional checksums.
Currently, of the supported barcode types that BarcodeXpress can write, only types Industry 2 of 5, Interleaved 2 of 5, Code 39, and Code 39 Extended allows an optional checksum. This property is ignored for other barcode types that require checksums.
Default value: 0 (False)