E Z R a d i o - 2 Wa y L i n k - D K
Rev. 0.1
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2.5. Test Modes
2.5.1. Bidirectional (TRx) Range Test
After the demo is fully configured, it proceeds to the demo screen, where the range test can be started. The screen
is divided into three sections. At the top of the screen, soft labels show the functions of the LEDs. LED1 blinks
when a packet is transmitted; LED2 blinks if a packet is successfully received (with valid CRC and packet content
that matches the expected value).The bar graph under LED3 shows the actual Receive Signal Strength Level
(RSSI) of the received packet (shown and refreshed after a packet is received).
The middle section of the screen shows the part number of the radio and the source / destination addresses with
arrows showing direction of the communication. RF parameters can be checked in the middle section before
transmission / reception is started.
Figure 14. Demo Screen (TRx Mode)
On the bottom of the screen, the soft labels show the actual functionality of the push buttons. PB3 are used to
return to the configuration menu. After entering demo mode, both ends of the link are in receive mode. The test
starts if any of the link nodes starts to transmit ping packets. Transmission can be initiated by pressing PB1. After
that, the originator transmits a ping packet for the other node. If it receives the packet correctly, it transmits back an
acknowledgement packet. Each ping packet has a serial number (increased by the originator after every packet
transmission), which is transmitted back by the acknowledgement packet. If the originator receives the
acknowledgement within a predefined timeout, then it considers the link working, otherwise it increases the number
of missed packets by one. The originator also stores the number of transmitted PING packets so the demo can
calculate the Packet Error Rate based on this information. The Packet Error Rate is updated on the third line of the
LCD after each packet transmission according to PER equation in section “2.1. Basics”.
Figure 15. Running PER Test (TRx Mode)
The demo runs as long as the number of transmitted packets reaches the predefined number or until it is
interrupted by PB1.
The user can check predefined RF parameters of the measurement any time during a running test by using PB4.
PB4 also is used in the info screen to show the actual results of the running measurement. Info screen is also
available after all the packets are transmitted and the test is finished.
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