Chengdu Ebyte Electronic Technology Co., Ltd.
E220-900T30D User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co.,Ltd.
15
The higher the air rate, the smaller the delay and
the shorter the transmission distance.
0
0
0
Air Data Rate 2.4k
0
0
1
Air Data Rate 2.4k
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
03H
Read/
Write
REG1
7
6
Sub-Packet Setting
The data sent by the user is less than the
sub-packet length, and the serial port output of the
receiving end appears as an uninterrupted
continuous output;
The data sent by the user is larger than the packet
length, and the serial port of the receiving end will
be output in packets.
0
0
200 bytes
（
default
）
0
1
128 bytes
1
0
64 bytes
1
1
32 bytes
5
RSSI Ambient noise enable
After enabling, you can send commands C0 C1
C2 C3 in transmission mode or WOR sending
mode to read registers;
Register 0x00: Current environmental noise RSSI;
Register 0X01: RSSI when receiving data last
time
(The current channel noise is: dBm =-RSSI/2);
Instruction format: C0 C1 C2 C3+start
read length;
Return: C1 + a read read valid
value; for example: send C0 C1 C2 C3 00 01
Return C1 00 01 RSSI
(address can only start
from 00)
0
Disable
（
Default
）
1
Enable
4
3
2
Reserve
1
0
Transmitting Power
The relationship between power and current is
non-linear, and the power supply has the highest
efficiency at maximum power;
The current will not decrease in the same
proportion as the power decreases.
0
0
30dBm
（
default
）
0
1
27dBm
1
0
24dBm
1
1
21dBm
04H
Read/
Write
REG2
Channel Control
（
CH
）
0-80 represents a total of 81 channels
Actual frequency = 850.125 + CH *1M
05H
Read/
Write
REG3
7
Enable RSSI Byte
After being enabled, the module receives wireless
data and outputs it through the serial port TXD,
followed by an RSSI strength byte.
0
Disable
（
Default
）
1
Enable
6
Transmission Method
During fixed transmission, the module will
recognize the first three bytes of serial data as:
address high + address low + channel, and use it
as a wireless transmission target.
0
Transparent transmission mode
（
default
）
1
Fixed transmission mode
5
Reserve
4
LBT Enable
After enabling, monitoring will be conducted
before wireless data 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
0
Disable
（
default
）
1
Enable
