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Introduction to RFID
Radio Frequency Interference
16
58978L-008 Rev. A RFID Programming Guide 11/14/2008
Radio Frequency Interference
Radio Frequency (RF) interference can be caused by many sources. This interference can
affect RFID performance by limiting the range of the RFID tags or preventing reading/writing
to the tags.
• Foil and metal-based media should not be used for RFID applications. Metal reflects radio
frequency signals and is a leading source of RF interference.
• Water and other liquids can absorb RF signals. Some media adhesives and label materials
can be unexpected sources of liquids that cause performance problems.
• Other RF equipment can cause interference if the equipment is positioned too close
together. Allow sufficient physical space between the RFID printer and other RF products
that share the same bandwidth (such as antennas, readers, wireless LANs, or other RFID
printer/encoders).
ZPL Commands for RFID Applications
Each RFID label has memory that can be read and most have memory that can be written to
through Zebra Programming Language (ZPL) commands. Use ZPL to read and write to
(encode) RFID labels just as you would use ZPL to print data on the labels. You can use
serialized fields, field variables, and any other ZPL features (such as the command ^HV
on page 88 to return the results to a host computer).
RFID-specific ZPL commands are described in ZPL II Commands for RFID on page 79. For
examples of how to use the ZPL commands, see Create and Send an RFID Label Format
on page 30.
For more information about non-RFID ZPL commands and how to use them, refer to the
ZPL II Programming Guide. A copy is available online at http://www.zebra.com/manuals.
SGD Commands for RFID Applications
Your RFID printer is able to use Set/Get/Do (SGD) commands just as it does ZPL commands.
Many ZPL commands have equivalent SGD commands. Usually, you will need to run one
SGD command for each parameter in the corresponding ZPL command. RFID-specific SGD
commands are described in SGD Commands for RFID on page 129.
For more information about non-RFID SGD commands and how to use them, refer to the
ZPL II Programming Guide. A copy is available online at http://www.zebra.com/manuals.