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5. UT-9921 RS-232 Interface Communication
6. LoRa Configuration
6.1 Configuration Steps
LoRa devices must be configured with the same LoRa parameters
to communicate with each other. These parameters include:
spreading factor, bandwidth, coding rate, and frequency. After
powering on the device, short press the Reset button for 1 second
to enter the configuration mode. Use the configuration tool to
perform the configuration. Enter the following link:
https://www.szutek.com/show-968.html or scan the QR code
below to download and use the tool. Connect the device's serial
port using a serial cable and open the configuration tool.
Click "Open Serial Port," then click "Search Devices" to display the
relevant parameters of the device. Users can configure the
parameters for communication. The default parameters are shown
in the figure below.
Parameter Definitions:
1. Baud Rate: The baud rate for serial communication, selectable
from 1200 to 115200 bps.
2. Parity: The parity for serial communication, which can be None,
Odd, or Even.
The data bits are fixed at 8, and the stop bits are fixed at 1.
3. Frequency: 464 to 515MHz, default is 490MHz. As the default
antenna is for 490MHz, it is recommended to choose a frequency
between 470 and 510MHz to avoid antenna mismatch. Different
LoRa networks are mainly distinguished by different frequencies to
prevent interference.
4. Channel: After setting the frequency, the channel will change
automatically.
5. Bandwidth: 125 to 500KHz.
6. Coding Rate: 4/5 to 4/8.
7. Spreading Factor: SF5 to SF12, larger values result in slower data
transmission.
8. Transmit Power: 1 to 22dBm.
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