(TBarcodeFmx2D_RSS14, TBarcodeFmx2D_RSSLimited)
Specifies whether the check digit should be automatically appended to the barcode symbol.
property AutoCheckDigit: Boolean;
The RSS-14 and the RSS Limited barcode symbologies encode the GS1 14-digit EAN.UCC item identification number (Global Trade Item Numbers, GTINs) in a symbol, its last digit represents the check digit. It is a form of redundancy check used for error detection. It consists of a single numeric character computed from the other character in the EAN.UCC item identification number.
The property specifies whether the check digit should be automatically appended to the barcode symbol.
If the AutoCheckDigit property is set to false, the check digit shall be included in the barcode text, so the length of barcode text shall is 14 numeric characters, and the last numeric character in the barcode text is the check digit.
If the AutoCheckDigit property is set to true, the check digit will be appended automatically by the component, so the length of barcode text shall is 13 numeric characters, and the check digit isn't required in the barcode text.
Note, the leading Application Identifier (01) is implied and is not encoded in the symbol. so it isn't required in the barcode text.
See also the "Check digit" section in the "TBarcodeFmx2D_RSS14" and "TBarcodeFmx2D_RSSLimited" articles.