Chengdu Ebyte Electronic Technology Co.,Ltd. E31-433T30D User Manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co.,Ltd.
14
4-0
：
（
425M + CHAN * 0.1M ), default 50H
（
433M
）
5
OPTION
7
Fixed point send enable bit
（
similar to M ODBUS
）
When value is 1, the first 3 bytes of each
user data frame are used as the high and
low addresses and channels. When
transmitting, the module changes its own
address and channel, and when it is
finished, it restores the original settings.
0
Transparent transmission mode
1
Fixed point transmission mode
6
IO drive mode
（
default 1
）
This bit is used to enable the internal
pull-up resistor of the module. Open-
drain mode is more adaptable, and in
some cases an external pull-up resistor
may be required.
1
TXD
、
AUX push-pull output
，
RXD pull up input
0
TXD
、
AUX
open-drain outputs
，
RXD
open-drain
inputs
5
4
3
Wireless wakeup time
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.
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 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.
0
Turn off FEC
1
Open FEC
（
default
）
1
0
Transmitting power (Approximate value)
The external power supply must provide
more than 1.5A 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.
0
0
30dBm
（
default
）
0
1
27dBm
1
0
24dBm
1
1
21dBm
For example
（
The meaning of the No. 3 "SPED" byte
）：
The binary digit of the byte
7
6
5
4
3
2
1
0
Specific value
（
Users configure
）
0
0
0
1
1
0
1
0
M eaning
Serial parity bit
8N1
Serial port baud rate 9600
Air data rate 2.4k
Corresponding hexadecimal
1
A
