Zebra RFID Printers create voided tags when using Monza4 UMI Bit Function

Article ID: 69367154




Topic or Information

July 2015 - Zebra customers may find that tags with newer Monza4 chips void and older Monza4 tags do not with the same data stream.

Applies To

Zebra RFID Printers including RZx00, R110Xi4, ZD500R, ZE500R and ZT4x0R

Impinj Monza4 Tags


Impinj released an updated version of the Monza4 chip with a change to the UMI bit function. This change can cause voids when attempting to print and encode using the Zebra Printers.The UMI (User Memory Indicator) bit is part of the PC (protocol control) bits, which is a portion of the EPC memory bank that tells a reader how much data is contained in the EPC. Because the UMI bit is now fixed, an attempt to rewrite it can cause the printer to void the tag. 

Details and resolution on the Monza4 Void Issue Read More>>


Joe V



+ Product Codes

  • R110Xi4 RFID Printer
  • RZ400
  • RZ600
  • ZD500R RFID Printers
  • ZE500R RFID Print Engine
  • ZT410 RFID Industrial Printer
  • ZT420 RFID Industrial Printer