One of the binary level barcodes, developed by Monarch Marking Inc., in 1972. Seven Black & White and Narrow & Wide bars make up this barcode standard. Its name was derived from its composition. It is also generally called CODABAR.
NW-7 lends itself to easily printing serial numbers due to its comparatively simple bar compositions, discrete type, relaxed gaps, and son on.
We can choose start and stop characters from four alphabet characters: a, b, c, and d, and as a result, there are 16 pattern (4 x 4) combinations that indicate content data.
Checkdigit is not needed, if it is used however, 7 (or 9) check is often used due to its ease of serial number printing.
Summary of NW-7 Symbol
|Character set||4 types of Start/Stop character
Numerics, 10 arphabet characters and marks
|Length of symbol||variable|
|Character Density||about 5 chars/cm|