Rev1.1
8 of 30
www.semtech.com
SX1211SK868/915 User Guide
Brief narrative of LEDs and push buttons
Power
: Switch on or switch off the power supply
Frequency band
: Switch to select the frequency band according to the SX1211 frequency
band
RF Output Power
: LEDs which indicate the transmitted output power: 10, 7, 4, 1, -2, -5dBm
RF power Selection
: Push button used to select the desired output power value
Frequencies
: LEDs which indicate the frequency used.
Frequency Selection
: Push button used to select a frequency with the manual mode
Tx LED
: LED which indicates an RF transmission
Rx LED
: LED which indicates that a message has been received correctly
Control buttons
C0 / C1
: Configuration Switch buttons
M/S
: Switch button to select between Master and Slaves
3.5
DEFAULT PING PONG TEST OVERVIEW
The first Ping Pong demonstration allows RF communication between two points to be achieved. The
communication is made between a board operating as Master and a board operating as a Slave. In
addition two operating modes are available: Automatic and Manual.
With the Automatic mode, the Master sends a message to the Slave every 125ms and changes
transmission frequency after 1s (Auto-jump). When the Master receives an acknowledge message
from the Slave or when the Slave receives a message from the Master, the Rx yellow LED lights up
(Communication OK).
The Manual mode is the same as Automatic mode. The main difference is the selection of the
frequency. In this case a user selects the frequency by pushing on the "Frequency Selection" button.
