JDF or PJTF output can include PostScript marks flats that contain custom bar codes for preventing collation and folding errors in postpress equipment. The finishing equipment scans the coded text-mark variables in each mark to check that all the signatures belong to the same job and are in the correct sequence.

Note: Before adding PostScript-coded marks such as bar codes to a job, you must select the Output PS marks flats for PJTF/JDF check box on the Output tab in the Preferences dialog box.

When deciding where to place a bar code mark, be sure to apply any guidelines provided by the finishing equipment manufacturer. You typically place the bar code in the spine or grip area, positioned so that the bar code scanner will be able to read it. 

The bar code that you select depends on the target equipment that the mark was designed for, in accordance with the manufacturer's requirements. The software includes bar code images that can be read by Müller Martini and Wafer Systems Technologies (WST) optical scanners during job finishing:

Each mark contains the job and signature ID text-mark variables, with a defined number of digits allocated for each variable. Leading zeros automatically fill the bar code when fewer digits are required. Otherwise, the value is truncated from the front to the defined number of digits:

Note: All ID numbers must contain digits only. The job will fail to preview or print if an applicable ID contains any characters that are not numeric. If the job does not contain a job ID and the bar code requires the job ID, the job will still print, but the job ID portion of the bar code will be set to all zeros.

Bar code marks are cross-platform compatible. However, they can be previewed only on the same platform (Microsoft Windows or Mac OS) on which the press-run layout was created. 

If you have a solid understanding of the PostScript language and bar code technology, you can edit the number of digits for the signature and job ID.