User Guide

Frequency Setting
Functionality of the Embedded Modules 21
Regional Frequency Quantization
When manually setting frequencies the module will round down for any value that is not
an even multiple of the supported frequency quantization.
For example: In the NA region, setting a frequency of 902,999 kHz results in a
setting of 902,750 kHz.
When setting the frequency of the module, any frequencies outside of the valid range for
the specified region are rejected.
Frequency Hop Table
The frequency hop table determines the frequencies used by the modules when
transmitting. The hop table characteristics are:
Contains up to 62 slots.
Valid frequencies for the region currently selected.
Changes not stored in flash, thus changes made are not retained after a power cycle
or a restart of the boot loader.
Inability to change individual entries after uploading without reloading the entire table.
Frequencies used in the order of entries in the table.
If necessary for a region, the hop table can be randomized to create a pseudo-random
sequence of frequencies to use. This is done automatically using the default hop tables
provided for each region.
Frequency Hop Interval
When hopping frequencies the period of time the module will stay on an individual
frequency is defined by the Hop Interval. This value is based on the region’s regulatory
requirements and indicates the maximum time the reader will stay on a frequency which
Region
Frequency
Quantization
Minimum
Frequency
Maximum
Frequency
NA 250 kHz 902,000 kHz 928,000 kHz
EU3 100 kHz 865,600 kHz 867,600 kHz
PRC 250 kHz 920,125 kHz 924,875 kHz
Open 50 kHz 860,000 kHz 930,000 kHz