Ebyte E90-DTU User Manual page 16

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7，6，5 UART baud rate（bps）
000：baud rate is 1200
001：baud rate is 2400
010：baud rate is 4800
011 ： baud rate is 9600
（Default）
100：baud rate is 19200
101：baud rate is 38400
110：baud rate is 57600
111：baud rate is 115200
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4，3： UART parity bit
00：8N1（Default）
01：8O1
REG0
10：8E1
11：8N1（same as 00）
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2，1，0，air data rate
000：air data rate is 0.3k
001：air data rate is 1.2k
010：air data rate is 2.4k
（Default）
011：air data rate is 4.8k
100：air data rate is 9.6k
101： air data rate is 19.2k
110： air data rate is 38.4k
111： air data rate is 62.5k
7，6： sub-packing setting
00：240byte （Default）
01：128byte
10：64byte
11：32byte
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5 ：enable RSSI environmental noise
1：on
0：off（Default）
REG1
---------------------------------------------
--
4，3，2 remain
---------------------------------------------
--
1，0： TX power
00：37dbm（Default）
E90-DTU SL User Manual
For the two modules that

communicate with each other, the
serial port baud rate can be different,
and the verification method can also
be different.
When transmitting large packets

continuously, users need to consider
the data blocking caused by the
same baud rate, and data may even
be lost. It is generally recommended
that both parties have the same baud
rate.
-------------------------------------
 It should be the same for both
communication parities.
The higher the rate, the shorter the

distance.
When the data is smaller than the

sub packet length, the serial output
of the receiving end is an
uninterrupted continuous output.
When the data is larger than the sub
packet length, the receiving end
serial port will output the sub
packet.
--------------------------------------
When enabled, the C0 C1 C2 C3

command can be sent in the
transmitting mode or WOR
transmitting mode to read the
register.
Register 0x00: Current ambient
noise rssi
Register 0X01: rssi when the data
was received last time.
（Current channel noise is: dBm
=-RSSI/2）
Command format: C0 C1 C2 C3 +
starting address + read length
Returns: C1 + address address + read
length + read valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi