One of the binary level barcodes, developed in comparatively early stage by Monarch Marking Inc., in 1972.
It names for its composition of two type of bars, Narrow and Wide, and they make one figure with seven black/white bars of them. Generally called CODABAR.

With NW-7, it is easy to print serial numbers, for its comparatively simple bar compositions and discrete type, and relaxed gaps, and it is so often used for some management business which serial number printing is needed, such as blood management, slips of home-delivery services, library management, registered mail management, etc.

We can choose start and stop characters from four alphabet: a, b, c, d, so there is 16 patterns (4 x 4) of combination; and that indicates the content of data.

checkdigit is not needed. If used, 7 (or 9) check is often used for its easiness for serial number printings.
In Japan, it is standardized as JIS X 0503, in 1994.


* character set กกกก 4 types of Start/Stop character
Numerics, 10 arphabet characters and marks
* Code type discrete
* Length of symbol variable
* Self check yes
* Checkdigit optional
* Character Density about 5 chars/cm

Character Compositions

[Character composition of NW-7]

List of Barcode Types

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