Broadcasting And Monitoring; Communication Key; Enable Repeater; Enable Lbt - Ebyte E90-DTU User Manual

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Chengdu Ebyte Electronic Technology Co., Ltd

3.4.8 Broadcasting 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.

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.

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.

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

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.

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 address + read length

⚫ Return：C1 + address address+read length+read valid value；for example：send C0 C1 C2 C3 00 01

⚫ Return C1 00 01 rssi

E90-DTU(400SL30-ETH) User Manual

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400sl30-eth