Chengdu Ebyte Electronic Technology Co., Ltd. E77-xxxM22S User Manual
Copyright © 2012-2 024 , Chengdu Ebyte Electronic Technology Co., Ltd.
12.1 The communication distance is very close
When there are straight-line communication obstacles, the communication distance will be correspondingly
attenuated.
Temperature, humidity, and co-channel interference will cause the communication packet loss rate to increase.
The ground absorbs and reflects radio waves, and the test effect is poor when close to the ground.
Seawater has a strong ability to absorb radio waves, so the test results at the seaside are poor.
If there are metal objects near the antenna, or if it is placed in a metal case, the signal attenuation will be very
serious.
The power register setting is wrong and the air rate is set too high (the higher the air rate, the closer the distance).
The low voltage of the power supply at room temperature is lower than the recommended value. The lower the
voltage, the smaller the power generated.
There is a poor match between the antenna and the module or there is a problem with the quality of the antenna
itself.
12.2 Modules are easily damaged
Please check the power supply to ensure it is within the recommended value. If it exceeds the maximum value, it
will cause permanent damage to the module.
Please check the stability of the power supply. The voltage cannot fluctuate greatly and frequently.
Please ensure anti-static operation during installation and use, as high-frequency devices are sensitive to static
electricity.
Please ensure that the humidity during installation and use should not be too high, as some components are
humidity sensitive.
If there are no special needs, it is not recommended to use it at too high or too low temperature.
12.3 Network access failed
When accessing the OTAA network, please check whether the three parameters of APPKEY, DEVKEY, and
DEVEUI are the same as the server settings. Check whether the node frequency band, gateway frequency band, and
server settings are the same;
If this module has successfully connected to the network and changed the APPKEY, DEVKEY, and DEVEUI
parameters to re-enter the network as a new node, you need to use AT+RESTORE to reset the parameters and then
set them;
When using ABP communication, the server will record the fcnt (frame count) of the module each time it is
uploaded. If it is less than the previous value, communication will not be possible. The module will not save each
fcnt, which will cause great damage to the flash. When using TTN, you need to reset the MAC parameters every
time. When using chirpstack, you need to check the ignore frame technology;
When otaa connects to the network, it shows devnoce to small. This only appears in version 1.0.4. The devnoce of
each network connection will be incremented by one. This module will record it, but if the module restores the
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