Dragino LG01 LoRa, Руководство пользователя, Страница: 37 / 44

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LoRa Gateway User Manual ---Update:2017-02-21
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10 FAQ
10.1 Why there is 433/868/915 version LoRa part?
Different country has different rules for the ISM band for using the LoRa. Although the LoRa chip
can support a wide range of Frequency, we provide different version for best tune in the LoRa
part. That is why we provide different version of LoRa.
10.2 What is the frequency range of LG01 LoRa part?
The chip used in the LoRa part is:
Version LoRa IC Support Frequency Best Tune Frequency
433 Semtech SX1278 Band2(LF): 410 ~525Mhz
Band3(LF): 137 ~175Mhz 433Mhz
868 Semtech SX1276 Band1(HF): 862 ~1020Mhz 868Mhz
915 Semtech SX1276 Band1(HF): 862 ~1020Mhz 915Mhz
User can set the LoRa within above frequency range in the software.
10.3 How may nodes can the LG01 support?
The maximum support end-node depends on how the communication (how often) between the
end-nodes and gateway. In a lab testing using the simple LoRa example , if the end nodes try to
send data to the gateway at every 5 minutes, there will be data lost after the network has 20~30
nodes due to Channel Collision.
If user want to reach more nodes, user can consider using the polling method to ensure that each
time will only have a LoRa signal transmit in the frequency. If the gateway uses polling method to
get data from the end node, it can support several hundred nodes or more. Examples can see:
Polling example for LoRa .
10.4 What kind of Server the LG01 can support?
The Linux side of LG01 is OpenWrt, it is open source and users can develop application over it.
Basically it can support most IoT servers if use the right API. We have examples for how to
connect some servers via typical protocol (MQTT,RESTful) for IoT, MQTT or RESTful. From this link:
IoT Server Examples .