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200 200  == 3.1 How it works? ==
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203 203  The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
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207 207  In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>path:http://8.211.40.43/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H4.UseATCommand]] to set the keys in the devices.
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211 211  3.2 Example to join LoRaWAN network
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215 215  This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
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217 217  
218 218  [[image:image-20220523172350-1.png||height="266" width="864"]]
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313 313  
314 314  **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
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317 317  Total : 11 bytes payload
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319 319  
320 320  [[image:image-20220523180452-3.png]]
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