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The binary digit of the byte
Specific value（Users configure）
Meaning
Corresponding hexadecimal
8 Hardware design
It is recommended to use a DC regulated power supply to supply power to the module. The power supply ripple
factor should be as small as possible, and the module needs to be reliably grounded.
Please pay attention to the correct connection of the positive and negative poles of the power supply. If the reverse
connection is made, the module may be permanently damaged.
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TXD、AUX push-pull output，RXD pull up input
1
TXD、AUX open-drain outputs，RXD open-drain
0
5
4
3
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
2
0
Turn off FEC
Open FEC（default）
1
1
0
Transmitting power (Approximate value)
0
0
0
1
1
0
1
1
For example（The meaning of the No. 3 "SPED" byte）：
7
0
Serial parity bit
8N1
inputs
Wireless wake-up time
250ms（default）
500ms
750ms
1000ms
1250ms
1500ms
1750ms
2000ms
FEC switch
17dBm（default）
14dBm
10dBm
7dBm
6
5
4
0
0
1
Serial port baud rate 9600
1
E31-433T17D1B User Manual
pull-up resistor of the module.
Open-drain mode is more adaptable, and
in some cases an external pull-up resistor
may be required.
Both transmitter and receiver module
work in mode 0. The delay time is invalid
and can be any value.
The transmitter works in mode 1, and
will continue to transmit the call code for
the corresponding time.
The receiver works in mode 2, which
refers to the receiver's listening interval
(wireless wake-up) and can only receive
data from the module working in mode 1.
After the FEC is turned off, the actual
data transmission rate is increased, but
the anti-interference ability is weakened
and the distance is slightly closer. Please
choose according to the actual
application.
Both sides of
the communication must be turned on or
off.
The external power supply must provide
more than 200mA current output
capability. And ensure that the power
supply ripple is less than 100mV.
It is not recommended to use smaller
power transmission because of its low
power utilization efficiency.
3
2
1
1
0
1
Air data rate 2.4k
A
0
0
15
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