Chengdu Ebyte Electronic Technology Co., Ltd.
E22-900T30S1C User manual
Copyright ©2012–2021，Chengdu Ebyte Electronic Technology Co.,Ltd.
18
00：30dbm（default）
01：27dbm
10：24dbm
11：21dbm
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 = -（256 - RSSI）
）
Command format: C0 C1 C2 C3 + starting address
+ read length
Returns: C1 + a read read valid value
E.g: send C0 C1 C2 C3 00 01
Return C1 00 01 rssi
（Address can only start from 00）
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Power and current are nonlinear, and power
efficiency is highest at maximum power.
The current does not decrease in proportion to
the decrease in power.
05H
Read/W
rite
REG2
Channel control（CH）
0-80 represents a total of 81 channels
Frequency= 850.125 + CH *1M
06H
Read/W
rite
REG3
7
Enable RSSI
1：Enable
0：Disable（default）
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6，
Fixed point transmission
1：Fixed point transmission mode
0 ： Transparent transmission mode
（default）
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5
Enable reply
1：Enable repeater function
0：Disable repeater function
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4
LBT enable byte (monitor before
transmission)
1：Enable
0：Disable（default）
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3
WOR transceiver control
1：WOR transmitter
The
module
receiving
and
transmitting functions are turned on, and a
wake-up code is added when transmitting
data. Receiving is turned on.
0：WOR receiver（default）
The module is unable to transmit
data and works in WOR monitoring mode. The
monitoring period is as follows (WOR cycle),
which can save a lot of power.
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2，1，0，WOR cycle
000：500ms
When enabled, the module receives wireless data
and it will follow an RSSI strength byte after
output via the serial port TXD
.---------------------------------------
The module recognizes the first three bytes of the
serial data as: address high + address low +
channel and takes it as the wireless transmitting
target.
---------------------------------------
After the reply function is enabled, if the target
address is not the module itself, the module will
forward it once.
In order to prevent data return-back, it is
recommended to use it in conjunction with the
fixed point mode. That is: the target address is
different from the source address.
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When enabled, wireless data will be monitored
before it is transmitted, which can avoid
interference to a certain extent, but may cause
data delay.
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Valid only for mode 1.
After the WOR receiver receives the wireless data
and outputs it through the serial port, it will wait
for 1000ms before entering the WOR again. Users
can input the serial port data and return it via the
wireless during this period. Each serial byte will be
refreshed for 1000ms. Users must transmit the
first byte within 1000ms.
---------------------------------------------
Valid only for mode 1.
Period T = (1 + WOR) * 500ms, maximum
