check-sum verification: the checksum of code-39 is optional and made as the sum module 43 of the numerical value of the data digits.
code 39
max./min. code length: each symbology has own max./min. code length. they can be set to qualify data entry. if their max./min. code length is zero, the global min./max. code length is in effect. the length is defined as to the actual barcode data length to be sent. label with length exceeds these limits will be rejected. make sure that the minimum length setting is no greater than the maximum length setting, or otherwise all the labels of the symboblogy will not be readable. in particular, you can see the same value for both minimum and maximum reading length to force the fixed length barcode decoded.
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.
code 39
append: this function allows several symbols to be concatenates and be treat as one single data entry. the scanner will not transmit the embedded
again with the appended code, then codes will be transmitted without code id,
preamble and prefix. when a symbol was decoded without the appended code, the data will be transmitted without code id and prefix, but the postamble suffix codes are appended. this function is used when the first number of code
