Change Hop Table

Introduction

The Hop Table is the list of frequencies that are going to be used during RF operation.

Each region has a predefined Hop Table with all the available channels in that region. under some circumstances it may be interesting to reduce the set of frequencies a reader can use.

A typical use case is to avoid inter-reader interference in Dense Reader Mode.

Configuration

1. Find out the default Hop Table

The first step is to identify all the available frequencies in the current region.

This can be done accessing the reader/RF_FREQ_TABLE property at this URL

http://$READER_IP:3161/devices/$READER_ID/reader/parameter/RF_FREQ_TABLE

What follows are the available channels in ETSI region

2. Customize the Hop Table

Once we know all available frequencies in the working region, we can select some of those frequencies to create a custom Hop Table.

This is defined as a JSON string and then applied as follows

Where the Hop Table is defined as

{"rf.hopTable":"866300,866900"}