User Guide

Table Of Contents
Frequency Setting
Functionality of the Embedded Modules 19
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
maybe lower than that allowed by the regulatory requirements.The supported regions and
their maximum hop interval is defined in the following table:
Maximum Frequency Hop Interval
Region Max Hop Interval
NA 200 ms
Open 400 ms