RFID tools

Small helpers for everyday RFID work live here. For theory start with RFID basics, for label code take the ZPL course.

Before you print

Most «broken printer» reports are a wrong darkness, speed or label size away from working. Calibrate media first (gap vs black mark), print a configuration label to confirm DPI, and only then touch the code — nine times out of ten the ZPL was fine and the setup was not.

Test labels cheaply

Iterate on one label, not a thousand: print a single test piece after every change and keep a «known good» label file per printer to separate code faults from hardware drift. When the good file prints and yours does not, the bug is in your ZPL; when neither prints, look at the printer.