Ebyte E90-DTU User Manual page 19

Chengdu Ebyte Electronic Technology Co.,Ltd.
04H
Read/Write REG1
05H Read/Write REG2
06H Read/Write REG3
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0 1 0 Air speed 2.4k（default）
0 1 1 Air speed 4.8k
1 0 0 Air speed 9.6k
1 0 1 Air speed 19.2k
1 1 0 Air speed 38.4k
1 1 1 Air speed 62.5k
7 6 subcontract settings
0 0 240 bytes（default）
0 1 128 bytes
1 0 64 bytes
1 1 32 bytes
5 RSSI Ambient noise enable
0 disabled（default）
1 enabled
4 3 2 reserve
1 0 transmit power
0 0 2W（33dBm，default）
0 1 1W（30dBm）
1 0 500mW（27dBm）
250mW（24dBm）
1 1
channel control（CH）
0-83 represent a total of 84 channels
7 enable rssi byte
0 disabled（default）
1 enabled
6 transfer method
0 transparent transmission (default)
1 Fixed-point transmission
5 relay function
0 Disable relay function (default)
1 Enable relay function
4 LBT enable
0 disabled (default)
1 enable
E90-DTU(400SL33) User Manual
must be the same;
The higher the air rate, the smaller the delay and
the shorter the transmission distance.
The data sent by the user is less than the length of
the packet, and the output of the serial port at the
receiving end is presented as uninterrupted
continuous output；
If the data sent by the user is larger than the length
of the packet, the serial port at the receiving end
will output the packet.
After enabling, the command C0 C1 C2 C3 can be
sent in the transmission mode or WOR
transmission mode to read the register;
Register 0x00: current ambient noise RSSI;
Register 0X01: RSSI at Last Data Received
(The current channel noise is: dBm =-RSSI/2);
Instruction format: C0 C1 C2 C3 + start address +
read length;
Return: C1 + address address + read length + read
effective value; such as: send C0 C1 C2 C3 00 01
return C1 00 01 RSSI
Transmission power Power and current have a
nonlinear relationship, and the power supply
efficiency is the highest at maximum power;
Current does not decrease proportionally with
power reduction.
actual frequency = 410.125 + CH * 1M
When enabled, the module receives wireless data
and outputs it through the serial port TXD,
followed by an RSSI strength byte.
During fixed-point transmission, the module will
recognize the first three bytes of serial port data
as: address high + address low + channel, and use
it as the wireless transmission target.
After the relay function is enabled, if the target
address is not the module itself, the module will
start a forwarding;
In order to prevent data return, it is recommended
to use it in conjunction with the fixed-point mode;
that is, the destination address is different from
the source address.
After enabled, wireless data will be monitored
before transmission, which can avoid interference
to a certain extent, but may cause data delay;
The maximum stay time of LBT is 2 seconds, and
it will be issued forcibly when it reaches 2
seconds.