Head Test Fatal

~JN configures head Test Fatal. It applies to the printer session and subsequent formats and controls printer hardware or connectivity rather than label pixels.

ZPLr compatibility note

Recognized by the renderer but has no label-raster effect.

These are code examples only. This printer or session command does not produce a standalone label image.

Syntax

~JN

This command form has no parameters.

~JN basic example

Shows the parameterless command form in a complete ZPL sample.

Edit in editor

ZPLtilde-jn-basic-1.zpl

~JN

Primary source

Official Zebra reference

Use the manufacturer reference for printer- and firmware-specific behavior beyond ZPLr’s pinned rendering profile.

Open Zebra documentation