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ZPL II Commands for RFID
^HR
11/14/2008 RFID Programming Guide 58978L-008 Rev. A
^HR
Calibrate RFID Transponder Position
Description Use this command to initiate an RFID transponder calibration for a specific
RFID label. Results are returned to the host computer. This calibration is used to determine the
optimal programming position for RFID media that may not meet the transponder placement
specifications for the printer.
During transponder calibration, the printer feeds the RFID label one millimeter at a time while
taking readings (via the READ TAG command and the WRITE TAG commands) to profile the
RFID transponder. Based on the results, the printer determines the optimal programming
position for the label and returns a results table to the host. The calibrated value is used as the
programming position for the
^RS command, can be overwritten by the ^RS command, and is
saved to nonvolatile memory (the value is saved even if the power is turned off).
This calibration takes into account the print mode, backfeed mode, and tear off position. The
RUN option in the RFID TAG CALIB control panel parameter performs the same
calibration but does not create a results table.
Format ^HRa,b
This table identifies the parameters for this format.
Important • Consider the following before using this command:
• This command is not supported by all printers or firmware. See Printer and Firmware
Compatibility on page 82 for the list of printers and firmware with which you can use this
command.
• Do not perform transponder calibration for RFID media that meets the transponder
placement specifications for your printer. Doing so will slow the printer’s throughput
unnecessarily. To order media that is designed for use with your RFID printer, contact
your authorized Zebra reseller.
Important • If a label format specifies a value for parameter p (read/write position of the
transponder) in the
^RS command, that value will be used for the programming position for
all RFID labels until a new position is specified or until the printer is turned Off (
O) and then
back On (
I).
Parameters Details
a = start string
User text to appear before the results table.
Accepted values: any string less than 65 characters
Default value:
start
b
=end string
User text to appear after the results table.
Accepted values: any string less than 65 characters
Default value:
end