User's Manual

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LHT65 Temperature & Humidity sensor 34 / 40
Step5: Click the start button to download the image to LHT65.
*If you change different LoRa Frequency Bands/Region, you need using AT+FDR command
to restore factory data after program success
5.2 How to change the LoRa Frequency Bands/Region?
User can follow the introduction for how to upgrade image. When download the images, choose
the required image file for download.
5.3 How to choose the right frequency band set for US915, AU915, CN470 bands?
The frequency bands US915, AU915, CN470 total has 72 frequencies. As specify in LoRaWAN
1.0.3 Regional Parameters.xlsx
The LHT65 choose CHE=2 by default(US915/AU915). If user has issue to join the LoRaWAN
network, please check if the frequency band matches the LoRaWAN network settings. If not,
properly need to use AT+CHE command to change.
User can configure the LT to work in 8 channel models by using the AT+CHE command. For
example, in US band, the table is as below. If we run AT+CHE=2. The device will work in Channel
8-15
CHE
US915 Uplink Channels(125KHz,4/5,Unit:MHz,CHS=0)
0
ENABLE Channel 0-63
1
902.3
902.5
902.7
902.9
903.1
903.3
903.5
903.7
Channel 0-7
2
903.9
904.1
904.3
904.5
904.7
904.9
905.1
905.3
Channel 8-15
3
905.5
905.7
905.9
906.1
906.3
906.5
906.7
906.9
Channel 16-23
4
907.1
907.3
907.5
907.7
907.9
908.1
908.3
908.5
Channel 24-31