Code39 HIBC is exactly the same as normal Code39, with Code39OptionalCheckDigit property set to true. The standard also says that the starting character in the message must be a plus (+) symbol. Barcode DLL automatically adds this plus sign (+) if the encoded message does not meet this requirement.

The HIBC standard requires that the checksum digit to appear in the human readable. To satisfy this requirement, your program should explicitly set property ShowcheckDigit to TRUE to create a compliant HIBC symbol.

Setting Code39OptionalCheckDigit to FALSE does not affect the resulted barcode.