Chengdu Ebyte Electronic Technology Co., Ltd
E32-900T20D User Manual
Copyright ©2012–2021
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
17
5
4
3
wireless wake-up time
The transmit & receive module work in
mode 0, whose delay time is invalid & can
be arbitrary value.
The transmitter works in mode 1 can
transmit the preamble code of the
corresponding time continuously.
When the receiver works in mode 2, the
time means the monitor interval time
(wireless wake-up). Only the data from
transmitter that works in mode 1 can be
received.
0
0
0
250ms (default)
0
0
1
500ms
0
1
0
750ms
0
1
1
1000ms
1
0
0
1250ms
1
0
1
1500ms
1
1
0
1750ms
1
1
1
2000ms
2
FEC switch
After turn off FEC, the actual data
transmission
rate
increases
while
anti-interference ability decreases. Also the
transmission distance is relatively short.
Both communication parties must keep on
the same pages about turn-on or turn-off
FEC.
0
Turn off FEC
1
Turn on FEC (default)
1
0
Transmission power (approximation)
The external power must make sure the
ability of current output more than 250mA and
ensure the power supply ripple within 100mV.
Low power transmission is not
recommended due to its low power supply
efficiency.
0
0
20dBm (default)
0
1
17dBm
1
0
14dBm
1
1
10dBm
For example: The meaning of No.3 "SPED" byte:
The binary bit of the byte
7
6
5
4
3
2
1
0
Configures by user
0
0
0
1
1
0
1
0
Meaning
UART parity bit 8N1
UART baud rate is 9600
Air data rate is 2.4k
Corresponding hexadecimal
1
A
Note: When the module communicates with other E32 modules, pay attention to the communication channel to be
consistent. For example, the starting frequency of the E32 915 series is 900Mhz. To communicate with this module, the
value of the register (CHAN) numbered 4 should be 0x35.
8 Basic operation
8.1 Hardware design
It is recommended to use a DC stabilized power supply. The power supply ripple factor is as small as possible, and
the module needs to be reliably grounded.
；
