What are the common causes of reading failures?

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• Tag is too far from the reader
• Tag is placed on a surface it was not intended for
• Reader signal is blocked by an object between the reader and the tag
• Reader signal is being reflected off an object or flat surface
• For fixed readers, the cable connecting the reader and antenna is loose
• Reader transmit power is not set to the maximum level
• Reader antenna is not aimed at the tag
• Reader is not set for the correct region, e.g., ETSI instead of FCC
• Dynamic range of the sensor is exceeded, especially in the case of moisture sensors
• With software that supports registering sensors, trying to read unregistered tags can give the appearance of a read failure
• All antennas have a pattern of blind spots, called nulls, and so pointing the reader into a null can lead to read failure or greatly reduced read range

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