Silicon Laboratories EZR-LCDK2W-434, User Manual

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E Z R a d i o - 2 Wa y L i n k - D K
Rev. 0.1 5
2. Range Test Demo
2.1. Basics
As earlier described, the range test demo is used to provide measured results on the quality of the RF link.
The demo uses two RFsticks: one as the ‘transmitter’ (TX) and the other as the ‘receiver’ (RX). Both RFsticks can
be either transmitters or receivers.
The transmitter sends packets to the receiver repeatedly with half second intervals. The packet includes the
address of the transmitter and number of the sent packet. The packet number increments from packet to packet.
The receiver receives the packet and checks its address. If their addresses match, the packet number is stored.
The receiver then sends back an acknowledge packet (ACK) to the transmitter. The ACK packet also includes the
address and packet number of the received packet.
PER can be calculated with the following equation:
where:
 PER: packet error rate (%).
 P
TX
: number of sent packets.
 P
RX
: number of received packets.
Transmitter can calculate PER using the following data:
 P
TX
: packet counter to be included in the packet.
 P
RX
: number of all the received acknowledge packets.
Receiver can calculate PER using the following data:
 P
TX
: packet number included in the last received packet.
 P
RX
: number of all received data packets.
2.2. RF and Packet Parameters
This section provides information on user parameters of the range test demo. All the parameters (excluding fre-
quency band and self node address) can be changed in the demo through its menu system (see section “2.4.
Menu System of the Range Test Demo”). The following parameters are available:
 RF parameters

Frequency band (defined by the HW)

Communication frequency

Modulation

Data rate

Output power
 Packet parameters

Packet length

Maximum number of sent/received packets

Self node address (defined by the HW)

Destination node address
Demo parameters are stored in the MCU’s flash memory and restored after power-on reset. Default values are
loaded if no parameters were previously stored in the flash.
It is also possible to define custom RF parameters for communication. Custom parameters can be stored with the
Wireless Development Suite (WDS). For more information on creating and storing custom RF parameters, refer to
the “WDS User’s Guide for EZRadio Next Generation”.
PER
P
TX
P
RX
–
P
TX
---------------------------
100

=
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