Chengdu Ebyte Electronic Technology Co., Ltd.
E90-DTU（2G4L27）User Manual
Copyright ©2012–2020
，
Chengdu Ebyte Electronic Technology Co., Ltd.
18
When the airspeed is 1M, the channel calculation formula is: 2400 +
CHAN * 3MHz;
When the airspeed is 2M, the channel calculation formula is: 2400 +
CHAN * 5MHz;
Continuous transmission mode:
When the baud rate is 1200, 9600, 19200, the channel calculation formula
is: 2400+CHAN*2MHz;
When the baud rate is 4800, 57600, 115200, the channel calculation
formula is: 2400+CHAN*4MHz;
When the baud rate is 460800, 921600, the channel calculation formula is:
2400+CHAN*5MHz;
5
OPTION
7
Fixed-point transmission enable bit (like ModBus)
When it is 1, the first 3 bytes of each user
data frame are used as high and low
addresses and channels. The module
changes its address and channel during
transmission, and restores the original
settings after completion; the continuous
transmission mode is transparent
transmission.
0
Transparent transmission mode
1
Fixed-point transmission mode
6
N/A
5
N/A
4
Test mode device type (reserved)
The slave address in the ranging mode is
confirmed by ADDH and ADDL.
0
Slave (default)
1
Host
3
LBT switch
After turning on LBT, the current channel
quality will be checked before sending
each packet of data. If it is good, send it
directly. If there is interference in the
channel, wait for the interference to
disappear before sending.
Support for air speeds below 115200,
which may affect the continuous
transmission function after opening.
0
Turn off LBT (default)
1
Open LBT
2
IO drive mode
This bit is used to enable the internal
pull-up resistor of the module; the
open-drain mode has stronger level
adaptability. In some cases, an external
pull-up resistor may be required.
1
TXD, AUX push-pull output, RXD pull-up input (default)
0
TXD, AUX open circuit output, RXD open circuit input
1
0
Transmitting power (approximate value)
The external power supply must provide a
current output capability of more than
100mA and ensure that the power supply
ripple is less than 100mV.
It is not recommended to use lower power
transmission, and its power utilization
efficiency is not high.
0
0
27dBm (default)
0
1
23dBm
1
0
20dBm
1
1
17dBm
For example (the meaning of serial number 3 "SPED" byte):
Binary bits of the byte
7
6
5
4
3
2
1
0
Specific value (user
configuration)
0
0
0
1
0
0
1
1
Representative meaning
Serial parity bit 8N1
The serial port baud rate is 9600
Air rate 10kbps
Corresponding hexadecimal
0
13
7.4 Configuration instructions on computer
The following figure shows the E90-DTU configuration interface on computer, users can switch to the command mode
Summary of Contents for 2G4L27
Page 1: ...E90 DTU 2G4L27 ...
