Writer / Barcode

An AS/400 program that serves as a link between an output queue and a printer. Normally the writer is started automatically at AS/400 IPL time.                                                  

X dimension or Module Width / Barcode

The nominal dimension (height, width, or diameter) of the smallest element in a barcode symbol. It is often expressed as multiple, as in 1X or 10X. Specifies the width of the narrowest unit in a barcode. Usually, this is the width of the narrowest bar or space. A single X dimension is called a "module." Wider elements in the barcode are measured as multiples of the X dimension. Therefore, the X dimension correlates directly with the overall width of the barcode and therefore its density. 

Optimize the Module Width
Printing tolerances can lead to problems when decoding a barcode. A remedy for this problem is to optimize the module width with respect to available printing resolutions.
Assume you want to print a barcode with a resolution of 300 dpi then one pixel equals 0.003333 inch (or 0.08466 mm) in such a case. To avoid raster errors, you should select a module width that is an integer multiple of the pixel width (e.g. for 300 dpi a multiple of 0.08466 mm).

Zero Suppression / Barcode

A technique used to shorten U.P.C. codes by removing zeros from the bar code in a predetermined manner.