The module is basic unit for expressing a data (for example, alphabet, arabia numbers, etc).
In general, the module consists of 256 pixels (16 length x 16 width pixel).

A character is expressed by linking several modules. The external size of module has diverse
shape (from 64 mm to 1,000 mm). which is depended on the usage.
However, regardless of size, one module is composed of 256 pixels (dots).