Chengdu Ebyte Electronic Technology Co., Ltd. E77-xxxM22S User Manual
Copyright © 2012-2 024 , Chengdu Ebyte Electronic Technology Co., Ltd.
4 Terms and Definitions
4.1LoRa
LoRa is one of the LPWAN communication technologies. Its full name is Long Range Radio, which means "long
range radio" in Chinese;
The company currently leading this technology is the foreign S emtech company;
LoRa's main ISM brand is in the global free frequency bands: 433MHz, 470MHz, 868MHz, 915MHz, etc.
Features: Low power consumption, long distance, low cost.
4.2 LoRaWAN
The LoRa Alliance is an open, non-profit organization led by Semtech in March 2015. The alliance released a
low-power wide area network standard based on an open source MAC layer protocol: the LoRaWAN protocol standard.
Network topology: star structure
Network composition: LoRa module, gateway (Gateway or base station), Server (including Network Server,
Network control, Application
Server).
LoRaWAN divides LoRa nodes into three categories: A/B/C:
Bidirectional transmission terminal (Class A):
Class A terminals will be followed by two short downlink reception windows after each uplink to achieve two-way
transmission. The terminal arranges transmission time slots based on its own communication needs, with small changes
based on random time (ie, ALOHA protocol). This Class A operation provides the lowest power end system for
applications, requiring only
The server's downlink transmission is performed within a short period of time after the terminal's uplink
transmission. Downstream transmissions performed by the server at any other time have to wait for the terminal's next
upstream transmission.
Bidirectional transmission terminal demarcating reception time slots (Class B):
Class B terminals will have more receive slots. In addition to the random receiving window of Class A, Class B
equipment will also open other receiving windows at designated times. In order for the terminal to open the receiving
window at the specified time, the terminal needs to receive a time synchronized beacon (Beacon) from the gateway. This
allows the server to know when the terminal is listening.
Bidirectional transmission terminal that maximizes receive time slots (Class C):
The Class C terminal basically keeps the receiving window open and only closes it briefly when sending. Class C
terminals consume more power than Class A and Class B, but at the same time, the delay from the server to the terminal
is also the shortest.
Note: E77-400/900M22S supports two device types: Class A and Class C;
4.3 ADR
ADR is called Adaptive Data Rate in Chinese. In the loraWan network system, in order to maximize the battery life
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