^HL or ~HL Command for RFID Data Logging Is Not Working

Article ID:

Issue / Question

When sending the ~HL or ^HL commands to an RFID printer, the log is not received back.

Applicable To

ZQ520R, ZT620R, ZT420R, ZT610R, ZT410R, ZD500R

Resolution / Answer

Zebra RFID label printers will continually log RFID data and store it in the printer’s RAM. The ^HL and ~HL commands request that the RFID data log be returned to the host computer, to clear the current data log, and to restart data recording.

The firmware version determines the way that these commands function:

  • In firmware X.20.16Z and later, for security, logging is disabled by default. The ^HL command clears the current data log and restarts data recording. The ~HL command does not automatically clear the data log.
  • In firmware X.20.15Z and earlier, logging is enabled by default. Both commands clear the current data log and restart data recording.

This can be turned on using the "rfid.log.enabled" SGD command string as seen below:-

! U1 setvar "rfid.log.enabled" "value"

"yes" = enables the RFID host log
"no" = disables the RFID host log

Please note!
If the printer loses power, the log is lost. If the log results are important to you, please retrieve the information frequently.

For more details on using the ^HL or ~HL command, please the ^HL or ~HL pages from the Zebra Programming Guide.

+ Applicable Products

  • ZD500R RFID Printers
  • ZQ520 RFID
  • ZQ520 RFID
  • ZT410 RFID Industrial Printer
  • ZT420 RFID Industrial Printer
  • ZT610 RFID Industrial Printer
  • ZT620 RFID Industrial Printer