checksum verification: the checksum is made as the sum module 103 of all data digits.
code-128
max./min. code length: refer to max./min. code length of code-39.
truncate leading/ending: refer to truncate leading/ending of upca.
code id setting: refer to code id setting of upca.
insertion group selection: refer to insertion group selection of upca.
append: when the function is enabled, it won't show the data immediately if scanner read the barcode includes fnc2 code. it will show all data until it read the barcode, which doesn't have fnc2 code.
