Ebyte E90-DTU User Manual page 14

Chengdu Ebyte Electronic Technology Co., Ltd.
Read/W
04H REG1
rite
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Serial port baud rate 9600
0 1 1
（default）
1 0 0 Serial port baud rate 19200
1 0 1 Serial port baud rate 38400
1 1 0 Serial port baud rate 57600
1 1 1 Serial port baud rate 115200
4 3 Serial parity bit
0 0 8N1（default）
0 1 8O1
1 0 8E1
1 1 8N1（equal to 00）
2 1 0 Wireless air data rate（bps）
0 0 0 Air data rate 0.3k
0 0 1 Air data rate 1.2k
0 1 0 Air data rate 2.4k（default）
0 1 1 Air data rate 4.8k
1 0 0 Air data rate 9.6k
1 0 1 Air data rate 19.2k
1 1 0 Air data rate 38.4k
1 1 1 Air data rate 62.5k
7 6 Sub packet setting
0 0 240 bytes（default）
0 1 128 bytes
1 0 64 bytes
1 1 32 bytes
5 RSSI Ambient noise enable
0 Disable（default）
1 Enable
4 3 Reserve
Abnormal working status log printing
2
enable
0 Disable（default）
1 Enable
1 0 TX power
E90-DTU(400SL42) User Manual
continuously, users need to consider the
data blocking and possible data loss
caused by the same baud rate.
It is generally recommended that both
communication parties have the same
baud rate.
The communication parties must have the
same air data rate.
The higher the air data rate is, the smaller
the delay in response, and the shorter the
transmission distance is.
When the data sent is smaller than the sub
packet length, the serial output of the
receiving end is an uninterrupted
continuous output.
When the data sent is larger than the sub
packet length, the serial port in receiving
end willsub packet the data and then
output them.
After enabling, the command C0 C1 C2
C3 can be sent in the transmission mode to
read the register.
Register 0x00: current ambient noise RSSI
Register 0X01: RSSI at Last Data
Received
(Current channel noise is: dBm =
RSSI));
Command format: C0 C1 C2 C3+start
address+read length;
Return: C1 + address + read length + read
valid value;
For example:
Send: C0 C1 C2 C3 00 01
Return: C1 00 01 RSSI (the address can
only start from 00)
Print logs in different formats according to
different abnormal working statuses. For
details, see Chapter
explanation of abnormal working
status log printing
Power and current are nonlinear, and
-(256 -
Detailed
6.5,
12