RAK7431
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RAK7431 can work in polling mode in order to send query instructions to RS485 nodes, and
convert the data returned into LoRa® frames to be relayed to the application server via a
LoRaWAN™ Gateway.
Figure 2 |
RAK7431 polling mode
RAK7431 can store a maximum of 32 query instructions in polling mode, each of which has
a maximum length of 128 bytes. Polling time interval and waiting time can be adjusted as
required.
RAK7431 converts the data returned by RS485 nodes into LoRa® packets that can be sent
to LoRaWAN™ Gateway in two ways: transparent or packet.
•
In transparent mode, RS485 data is encapsulated in the payload of LoRa® frames
as it is.
•
In packet mode, RS485 data is encapsulated in LoRa® frames with the addition of a
header and verification.
No matter whether polling mode is enabled or not, the server can actively send commands to
query the RS485 nodes through the LoRaWAN™ Gateway via the RAK7431. The
commands issued and the returned data can also be transmitted in transparent mode or in
packet mode.
