Chengdu Ebyte Electronic Technology Co., Ltd E34-2G4H27D User Manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co., Ltd
14
4
CHAN
7
、
6
、
5
、
4 N/A
0 is recommended
3
、
2
、
1
、
0 Communication level
00H
～
0BH, 12 channels in total
；
Fixed frequency mode
（
Mode 0
）
0-5
Communication frequency
：
2400M + CHAN * 2M
6-11
Communication frequency
：
2508M + (CHAN-6
）
* 2M
Frequency hopping mode
（
Mode 1
）
0-11
Communication frequency
：
2412M + CHAN * 2M
5
OPTION
7
Fixed transmission
（
similar to MODBUS)
In fixed transmission mode, the first three bytes
of each user's data frame can be used as high/low
address and channel. The module changes its
address and channel when transmit. And it will
revert to original setting after complete the
process.
0
Transparent transmission mode
（
default
）
1
Fixed transmission mode
6
IO
drive mode (default 1)
This bit is used to the module internal pull-up
resistor. It also increases the level’s adaptability
in case of open drain. But in some cases, it may
need external pull-up resistor.
1
TXD and AUX push-pull outputs,RXD pull-up inputs
0
TXD
、
AUX open-collector outputs;RXD open-collector inputs
5
、
4
、
3
、
2 N/A
0 is recommended
1
0
Transmission power (approximation)
The external power must make sure the ability of
current output more than 800mA and ensure the
power supply ripple within 100mV;
Low power is not recommended for power
supply is not effective
0
0
27dBm
（
Default
）
0
1
21dBm
1
0
15dBm
1
1
9dBm
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 250k
Corresponding hexadecimal
1
8
8. 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.
；
Please pay attention to the correct connection of the positive and negative poles of the power supply. Reverse
connection may cause permanent damage to the module
；
Please check the power supply to ensure it is within the recommended voltage otherwise when it exceeds the
maximum value the module will be permanently damaged
；
Please check the stability of the power supply, the voltage can not be fluctuated frequently
；
When designing the power supply circuit for the module, it is often recommended to reserve more than 30% of the