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TELETHINGS LORA NODE AS AT SLAVE DEVICE
INSTALATION HARDWARE AND SOFTWARE
INTRODUCTION
Telethings LoRa Node in the function of the AT Slave device implies a module with
already added firmware in order to perform the mentioned functionality. It is necessary to
have some kind of master device, which should be connected to the module, in order for the
module itself to perform its functionality. The master device connects to the module using
UART connection, and communicates with the module using AT commands. A list of AT
commands, with description of each of them, as well as how to use them, is in the document
“LoRaNodeATCommands.pdf”. For the purpose of this document, and an easier way of
clarifying how the node works, the master device will be simulated using TTL (UART
Debugger) that will be directly transferred to the computer. The Termite v3.1 application will
be used as a console application and it will show communication with the module.
HARDWER PREPARATION
In order for the device to function properly, it is necessary to do some hardware
changes before connecting the device to the power supply. Firstly, antenna should be
connected to the device, i.e. the coaxial cable must be soldered on the module. (Figure 3.)
Then, TLN UART RX and TLN UART TX pins should be connected with wires (Figure
5.), which will be connected to the TTL later on. After that, one wire should be wired to GND.
The following and the last step is to solve the power supply or to solder the wires on the VDD
MCU and VDD SX pins, through which a 3.3 V power will be supplied from the TTL. (Figure
4.)
Telethings LoRa Node actually uses LPUART, so pins TLN UART RX and TLN UART TX
are actually TLN LP UART RX and TLN LP UART TX.
If all of the above mentioned changes have been made, the device is ready for use.