Ebyte E90-DTU 400SL30-ETH-V2, Руководство пользователя, Страница: 10 / 23

Chengdu Ebyte Electronic Technology Co., Ltd
E90-DTU(230SL22-ETH) User Manual
Copyright ©2012–2021, Chengdu Ebyte Electronic Technology Co., Ltd
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3.1.8Broadcasting and Monitoring
Set the DTU radio address to 0xFFFF: It can monitor the data transmission of the module on the same channel; the transmitted
data can be received by the module at any address on the same channel, thus playing the role of broadcasting and monitoring.
3.1.9Communication key
Only write is allowed, the web end always displays 0x0000, and the communication key is used for user encryption to avoid
intercepting airborne wireless data by similar modules. The DTU internally uses these two bytes as a calculation factor to transform
and encrypt the over-the-air wireless signal.
3.1.10Enable repeater
After the repeater is enabled, if the target address is not the module itself, the module will initiate a forward. In order to prevent
data backhaul, it is recommended to use it in conjunction with the fixed point mode. That is: the destination address is different from
the source address.
3.1.11Enable LBT
The DTU has a Listen before talk (LBT) function. When this function is enabled, the channel environment noise will be actively
monitored before the wireless data is transmitted. If the noise exceeds the threshold, the transmission will be delayed. This function
can greatly improve the communication success rate of the DTU in harsh environments. It can be used for network transmission,
anti-collision processing, but may bring data delay, LBT maximum dwell time 2 seconds
3.1.12Enable RSSI byte
It is the signal strength indication function. When enabled, the STU wirelessly receives the data and will follow an RSSI strength
byte. It can be used to evaluate signal quality, improve communication networks, and range, and can be used to manually implement
LBT functions.
3.1.13Enable RSSI environment noise
When enabled, the C0 C1 C2 C3 instruction can be used to read the register in transfer mode or WOR transmit mode.
⚫
Register 0x00
：
current rssi of environment noise
⚫
Register 0x01
：
rssi for receiving data last time
（
current channel noise is
：
dBm =-RSSI/2
）
⚫
Command format
：
C0 C1 C2 C3 + starting a read length
⚫
Return
：
C1 + address read read valid value
；
for example
：
send C0 C1 C2 C3 00 01
⚫
Return C1 00 01 rssi