Newland NLS-FM420, Руководство по интеграции

Страница: 141 / 199

nlscan.com Page 131
Prefix/Suffix
Introduction
1D barcodes could contain digits, letters and symbols, etc. 2D barcodes could contain more data, such
as Chinese characters and other multi-byte characters. However, in reality, they do not and should not
have all the information we need, such as barcode type, date and time of scan, delimiter, and so on, in
order to keep the code short and fl exible.
Pre fi x and Suf fi x are how to ful fi ll the needs mentioned above. They can be added, removed, and
modi fi ed while the original barcode message is still in tact.
Barcode processing sequences:
1. Intercept barcode message
2. Add Pre fi x/Suf fi x
3. Pack
4. Terminate with Terminal and transmit