Ebyte E95-DTU User manual

E95-DTU(900SLxx-485)

Chengdu Ebyte Electronic Technology Co.,Ltd. E95-DTU(900SLxx-485) User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
Catalog
1.Product Overview ................................................................................................................................................1
1.1 Product introduction......................................................................................................................................... 1
1.2 Features .............................................................................................................................................................1
1.3 Quick start........................................................................................................................................................ 2
1.4 Description of each part................................................................................................................................... 4
1.5 Installation size.................................................................................................................................................5
2.Interface definition...................................................................................................................................................... 5
2.1 Power interface description ..............................................................................................................................5
2.2 Communication interface description.............................................................................................................. 6
3.Technical indicators.....................................................................................................................................................6
3.1 Model Specifications........................................................................................................................................6
3.2 General Specifications......................................................................................................................................7
3.3 Frequency range and number of channels........................................................................................................7
3.4 transmit power level ......................................................................................................................................... 7
3.5 air speed class ...................................................................................................................................................8
3.6 Current parameters ........................................................................................................................................... 8
3.7 Send and receive length and subcontracting method.......................................................................................8
4.Detailed function......................................................................................................................................................... 9
4.1 Fixed-point emission (hexadecimal)................................................................................................................ 9
4.2 Broadcast transmission (hexadecimal).............................................................................................................9
4.3 broadcast address..............................................................................................................................................9
4.4 listen address.................................................................................................................................................. 10
5.Operating mode......................................................................................................................................................... 10
5.1 Transparent transmission mode (mode 0) ...................................................................................................... 10
5.2 WOR mode (mode1)...................................................................................................................................... 11
5.3 Configuration Mode(mode2)......................................................................................................................... 11
5.4 Deep sleep mode(mode3)...............................................................................................................................11
6.Register read and write control................................................................................................................................. 12
6.1 Instruction format ...........................................................................................................................................12
6.2 register description ......................................................................................................................................... 13
6.3 Factory default parameters .............................................................................................................................16
7.Use of relay networking mode.................................................................................................................................. 17
8.Host computer configuration instructions.................................................................................................................18
9.Program the radio ...................................................................................................................................................... 19
10.Connection diagram in test and practical application ............................................................................................. 20
11.related product......................................................................................................................................................... 20
12.Practical application areas.......................................................................................................................................22
13.Precautions for use.................................................................................................................................................. 22
14.Important Notice......................................................................................................................................................23
Revise history ............................................................................................................................................................... 24
About us........................................................................................................................................................................24

Chengdu Ebyte Electronic Technology Co.,Ltd. E95-DTU(900SLxx-485) User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
Disclaimer and Copyright Notice
EBYTE reserves all rights to this document and the information contained herein.
Products, names, logos and designs described herein may in whole or in part be
subject to intellectual property rights. Reproduction, use, modification or disclosure to
third parties of this document or any part thereof without the express permission of
EBYTE is strictly prohibited.
The information contained herein is provided “as is” and EBYTE assumes no
liability for the use of the information. No warranty, either express or implied, is given,
including but not limited, with respect to the accuracy, correctness, reliability and
fitness for a particular purpose of the information. This document may be revised by
EBYTE at any time. For most recent documents, visit www.ebyte.com.

Chengdu Ebyte Electronic Technology Co.,Ltd. E95-DTU(900SLxx-485) User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
1.Product Overview
1.1 Product introduction
E95-DTU (900SLxx-485) is a wireless data transmission radio using military-grade LoRa modulation technology.
It has a variety of transmission methods and works in the (850.125MHz ~ 930.125MHz) frequency band (default
868.125MHz). The radio provides transparent RS485/RS232 interface , Using plastic shell, rail type installation
structure, support 8 ~ 28V (DC) voltage input. LoRa spread spectrum technology will bring longer communication
distance and has the advantage of strong anti-interference ability.
As a communication medium, wireless digital radio has a certain scope of application like optical fiber, microwave
and open wire: it provides real-time and reliable data transmission of monitoring signals in private networks under
certain special conditions, with low cost, installation and maintenance. It has the characteristics of convenience,
strong diffraction ability, flexible network structure, and long coverage. It is suitable for occasions such as many
and scattered points and complex geographical environment. It can be connected with PLC, RTU, rain gauge, liquid
level gauge and other data terminals.
1.2 Features
Using the latest LoRa technology, the distance is farther and the performance is more powerful than the
traditional LoRa digital radio;
With data encryption, sub-packet length can be set;
Adopt flame retardant plastic shell, guide rail type installation structure, convenient and efficient installation；
Use hidden buttons to switch the working mode to avoid false triggering, and the operation of the equipment is
more reliable；
Simple and high-efficiency power supply design, support power adapter or pressure line method, support 8 ~
28V (DC) power supply；
The transmit power can reach up to 22/30dBm, and supports multi-level adjustment, all technical indicators
meet industrial standards；
Support Modbus protocol transmission；
Support LBT function, the radio automatically waits for transmission according to the current environmental
noise intensity. Greatly improve the communication success rate of the radio in harsh environments；
Support wireless sending of command data packets, remote configuration or reading of radio station
parameters；
Support communication key function, effectively prevent data from being intercepted；
It can realize multi-level relay networking, effectively expand the communication distance, and realize
ultra-long-distance communication；
Using temperature compensation circuit, the frequency stability is better than ±1.5PPM；
Working temperature range: -40℃ ～+85℃, suitable for all kinds of harsh working environment, real
industrial grade products；
Multiple protection functions such as power reverse connection protection, over-connection protection,
antenna surge protection, etc., greatly increase the reliability of the radio；
The communication port and power interface adopt high isolation and high protection；

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Powerful software functions, all parameters can be set by programming: such as power, frequency, air rate,
address ID, etc.；
Built-in watchdog with precise time layout, once an abnormality occurs, the radio will automatically restart,
and can continue to work according to the previous parameter settings.
1.3 Quick start
You need to prepare two E95-DTU (900SLxx-485)
First, install the antenna for the digital radio, and then install the power supply. The user can choose the power
adapter to supply power according to their needs.
Use USB to RS485 or other methods to connect the computer to the digital radio；

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Start two serial port debugging assistants, select the serial port baud rate as 9600bps (default), and check the mode
as 8N1, then the serial port transparent transmission can be realized.；
If the customer needs to switch the working mode, it can be controlled by the Mode button to switch between
different working modes (M0 indicator light, M1 indicator light). Press and hold the Mode button for about 1ms
and then release it to switch the mode once. The mode switching details are shown in the table below：

Chengdu Ebyte Electronic Technology Co.,Ltd. E95-DTU(900SLxx-485) User Manual
Copyright ©2012–2022，Chengdu Ebyte Electronic Technology Co.,Ltd.
serial
number
Catalog
M1
M0
Notes
Mode 0
Transparent
mode
Off
Off
Serial port open, wireless open, transparent
transmission (factory default mode), support special
command air configuration.
Mode 1
WOR mode
Off
On
Can be defined as WOR sender and WOR receiver,
support air wake-up
Mode 2
configuration
mode
On
Off
The user accesses the register through the serial port to
control the working state of the radio, and the user can
configure the radio through the host computer
configuration software.
Mode 3
sleep mode
On
On
radio goes to sleep
Note: The radio has the function of power-down saving mode (the factory default setting is transparent
transmission mode), the user needs to switch the corresponding mode according to the M1 and M0 indicators
(effective immediately).
1.4 Description of each part
number
name
function
explanation
1
Mode
Mode switch
button
Working mode switching control
2
ANT
RF interface
SMA-K, external thread internal hole
3
DC
Power interface
DC power input port, crimped port
4
RS485
RS485
communication
port
Standard RS485 interface
5
PWR
Power Indicator
Lights up when the power is turned on

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6
TXD
send indicator
Blinks when sending data
7
RXD
Receive indicator
Blinks when receiving data
8
MO
Mode indicator
Working mode indicator
9
M1
Mode indicator
Working mode indicator
1.5 Installation size
2.Interface definition
2.1 Power interface description
E95-DTU (900SLxx-485) can be powered by 8~28V (DC) power supply, and the wiring port is connected by
wiring terminal (2 Pin).

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2.2 Communication interface description
The E95-DTU (900SLxx-485) can be connected to the device through RS485 using the terminal block.
number
standard
definition
function
explanation
1
G
signal ground
Anti-interference, grounding
2
A
RS485 bus A interface
The RS485 interface A interface is connected to
the device A interface
3
B
RS485 bus B interface
RS485 interface B interface is connected to
device B interface
4
TX
RS232 bus TX interface
The RS232 interface TX interface is connected
to the device RX interface
5
RX
RS232 bus RX interface
The RS232 interface RX interface is connected
to the device TX interface
Note: When the radio is connected with multiple devices, the communication is not smooth, but there is no such
phenomenon when a single device is connected. Please try to connect a 120Ω resistor in parallel between the
485_A terminal and the 485_B terminal.
3.Technical indicators
3.1 Model Specifications
Model Specifications
Frequency
Power
Distance
Specifications
Recommended
application scenarios
MHz
dBm
km
E95-DTU(900SL22-4
85)
850.125 ～
930.125
22
5
New generation
LoRa spread
spectrum, DC
long-distance,
interference-prone
environments.

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power supply
E95-DTU(900SL30-4
85)
850.125 ～
930.125
30
10
New generation
LoRa spread
spectrum, DC
power supply
long-distance,
interference-prone
environments.
Note: Sunny weather, open environment without obstruction, 12V/1A power supply, 5dBi suction cup antenna,
antenna height 2 meters from the ground, use factory default parameters.
3.2 General Specifications
number
name
Specification
explanation
1
Size
92*66*30 mm
See installation dimensions for details
2
Weight
95 g
Weight tolerance 5g
3
Working
temperature
-40℃～+85℃
Industrial grade
4
Voltage range
8～28V（DC）
12V or 24V recommended for DC version
5
Communicatio
n interface
RS485
RS485
6
baud rate
出厂默认 9600
Baud rate range 1200～115200
7
address code
出厂默认 0
A total of 65536 address codes can be set
3.3 Frequency range and number of channels
Model Specifications
Default
frequency
Frequency range
channel
spacing
number of channels
Hz
Hz
Hz
E95-DTU(900SLxx-485)
850.125M
850.125～930.125M
1M
81，half duplex
Note: In the same area, multiple groups of digital radios are used for one-to-one communication at the same time. It
is recommended that each group of digital radios should be set to a channel interval of more than 2MHz.
3.4 transmit power level
Model Specifications
22dBm / 30dBm
17dBm / 27dBm
13dBm / 24dBm
10dBm /
21dBm
E95-DTU(900SLxx-48
5)
Factory default
√
√
√

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Note: The lower the transmit power, the closer the transmission distance, but the working current will not decrease
proportionally, it is recommended to use the maximum transmit power.
3.5 air speed class
Model Specifications
Default air
rate
number of
levels
air speed class
bps
kbps
E95-DTU(900SLxx-485
)
2.4k
6
2.4、4.8、9.6、19.2、38.4、62.5
Note: The higher the air rate setting, the faster the transmission rate and the closer the transmission distance;
therefore, if the rate meets the usage requirements, it is recommended that the airspeed be as low as possible.
3.6 Current parameters
Model Specifications
Emission current
mA
receive current mA
sleep current mA
12V
12V
12V
E95-DTU(900SL22-485)
32.65
14.58
7.29
E95-DTU(900SL30-485)
158.4
15.8
7.73
Note: It is recommended to reserve more than 50% current margin when selecting the power supply, which is
conducive to the long-term stable operation of the radio.
3.7 Send and receive length and subcontracting method
Model Specifications
cache size
Subcontracting
E95-DTU(900SLxx-485
)
1000 ebytes
32/64/128/240 bytes can be sent by sub-packet
setting by command
Notes：
If the data received by the radio at a time is larger than the capacity of a single packet, the excess data will be
automatically allocated to the second transmission until the transmission is completed.；
The data received by the radio at a time cannot be larger than the buffer capacity.

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9
4.Detailed function
4.1 Fixed-point emission (hexadecimal)
4.2 Broadcast transmission (hexadecimal)
4.3 broadcast address
Example: Set the address of radio A to 0xFFFF and the channel to 0x04.
When station A is used as a transmitter (same mode, transparent transmission mode), all receiving stations under
the 0x04 channel can receive data to achieve the purpose of broadcasting.

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4.4 listen address
Example: Set the address of radio A to 0xFFFF and the channel to 0x04.
When radio station A is used as the receiver, it can receive all the data under the 0x04 channel to achieve the
purpose of monitoring.
5.Operating mode
E95-DTU has four working modes. When there is no strict low power consumption requirement, and normal
communication is required, it is recommended to configure the radio in the transparent transmission mode (mode
0);The default setting of the radio is transparent transmission mode (mode 0).
number
mode
M1
M0
注释
Mode 0
Transparent
mode
Off
Off
Serial port open, wireless open, transparent
transmission (factory default mode), support special
command air configuration.
Mode 1
WOR mode
Off
On
Can be defined as WOR sender and WOR receiver,
support air wake-up
Mode 2
Configuration
mode
On
Off
The user accesses the register through the serial port to
control the working state of the radio, and the user can
configure the radio through the host computer
configuration software.
Mode 3
deep sleep
mode
On
On
radio goes to sleep
Note: If there is no need for low power consumption, no need to care about the WOR mode (mode 1).
5.1 Transparent transmission mode (mode 0)
Type
When the M0 indicator is off, the M1 indicator is off, and the radio works in mode 0
Transmit
Users can input data through the serial port, and the radio will start wireless transmission.
Receive
The radio wireless receiving function is turned on, and the wireless data will be output
through the serial port TXD pin after receiving the wireless data.

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5.2 WOR mode (mode1)
Type
When the M0 indicator is on, the M1 indicator is off, the radio works in mode 1
Transmit
When defined as a transmitter, a wake-up code for a certain period of time will be
automatically added before transmission
receive
Data can be received normally, and the receiving function is equivalent to mode 0
5.3 Configuration Mode(mode2)
Type
When the M0 indicator is off, the M1 indicator is on, the radio works in mode 2
Transmit
Can be configured wirelessly
Receive
Can be configured wirelessly
Configuratio
n
User can access registers to configure radio working status
5.4 Deep sleep mode(mode3)
Type
When the M0 indicator is on and the M1 indicator is on, the radio works in mode 3
Transmit
Unable to transmit wireless data.
Receive
Unable to receive wireless data.

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12
6.Register read and write control
6.1 Instruction format
In configuration mode (mode 2: the M1 indicator is on, the M0 indicator is off), the list of supported commands is
as follows (when setting, only 9600 and 8N1 formats are supported):：
Numb
er
Instruction
format
Detailed description
1
set register
Command: C0+start address+length+parameter
Response: C1+start address+length+parameter
Example 1: Configure the channel as 0x09
Command Start Address Length Parameter
Send: C0 05 01 09
Return: C1 05 01 09
Example 2: Configure the radio address (0x1234), network address (0x00), serial port
(9600 8N1), and airspeed (1.2K) at the same time
Send: C0 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
2
read register
Instruction: C1+start address+length
Response: C1+start address+length+parameter
Example 1: Reading a channel
Command Start Address Length Parameter
Send: C1 05 01
Return: C1 05 01 09
Example 2: Read radio address, network address, serial port, airspeed at the same time
Send: C1 00 04
Return: C1 00 04 12 34 00 61
3
set
temporary
register
Command: C2 + start address + length + parameter
Response: C1 + start address + length + parameter
Example 1: Configure the channel as 0x09
Command Start Address Length Parameter
Send: C2 05 01 09
Return: C1 05 01 09
Example 2: Configure the radio address (0x1234), network address (0x00), serial port
(9600 8N1), and airspeed (1.2K) at the same time

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Send: C2 00 04 12 34 00 61
Return: C1 00 04 12 34 00 61
5
Wireless
configuratio
n
Instructions: CF CF + regular instructions
Response: CF CF + regular response
Example 1: Wireless configuration channel is 0x09
Wireless Command Header Command Start Address Length Parameter
Send: CF CF C0 05 01 09
Return: CF CF C1 05 01 09
Example 2: Wirelessly configure the radio address (0x1234), network address (0x00),
serial port (9600 8N1), and airspeed (1.2K) at the same time
Send: CF CF C0 00 04 12 34 00 61
Return: CF CF C1 00 04 12 34 00 61
6
wrong
format
malformed response
FF FF FF
6.2 register description
num
ber
Rea
d/wr
ite
nam
e
description
notes
00H
Rea
d/wr
ite
AD
DH
ADDH（default 0）
Station address high byte and low byte;
Note: When the station address is equal
to FFFF, it can be used as a broadcast
and monitoring address, that is, the
station will not perform address filtering
at this time.
01H
Rea
d/wr
ite
AD
DL
ADDL（default 0）
02H
Rea
d/wr
ite
NET
ID
NETID（default 0）
Network address, used to distinguish the
network;
When communicating with each other,
they should be set to the same.
03H
Rea
d/wr
ite
RE
G0
7
6
5
UART serial rate（bps）
For two radio stations that communicate
with each other, the serial port baud rate
can be different, and the verification
method can also be different;
When continuously transmitting large
data packets, users need to consider the
data blocking caused by the same baud
rate, and may even be lost;
It is generally recommended that both
0
0
0
Serial port baud rate1200
0
0
1
Serial port baud rate2400
0
1
0
Serial port baud rate4800
0
1
1
Serial port baud rate9600
（default）
1
0
0
Serial port baud rate19200
1
0
1
Serial port baud rate38400
1
1
0
Serial port baud rate57600
1
1
1
Serial port baud
rate115200

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sides of the communication have the
same baud rate.
4
3
Serial check digit
The serial port modes of both sides of the
communication can be different;
0
0
8N1（default）
0
1
8O1
1
0
8E1
1
1
8N1（equal to 00）
2
1
0
wireless air rate（bps）
The air speed of both parties must be the
same;
The higher the air rate, the lower the
delay and the shorter the transmission
distance.
0
1
0
air speed 2.4k（default）
0
1
1
air speed 4.8k
1
0
0
air speed 9.6k
1
0
1
air speed 19.2k
1
1
0
air speed 38.4k
1
1
1
air speed 62.5k
04H
Rea
d/wr
ite
RE
G1
7
6
Subcontracting settings
When the data sent by the user is less
than the packet length, the serial output
of the receiving end is presented as
uninterrupted continuous output;
If the data sent by the user is larger than
the packet length, the serial port of the
receiving end will be output in packets.
0
0
240 ebytes（default）
0
1
128 ebytes
1
0
64 ebytes
1
1
32 ebytes
5
RSSI Ambient Noise Enable
After it is enabled, the C0 C1 C2 C3
instruction can be sent in the
transmission mode or the WOR
transmission mode to read the register;
Register 0x00: Current ambient noise
RSSI;
Register 0X01: RSSI when data was last
received
(The current channel noise is: dBm
=-RSSI/2);
Instruction format: C0 C1 C2 C3 + start
address + read length;
Return: C1 + address address + read
length + read valid value; such as: send
C0 C1 C2 C3 00 01
return C1 00 01 RSSI
0
disabled (default)
1
Start
Rea
d/wr
ite
4
3
2
reserve
1
0
transmit power
The relationship between power and
current is non-linear. At maximum
power, the efficiency of the power supply
is the highest; the current will not
0
0
22dBm / 30dBm（default）
0
1
17dBm / 27dBm
1
0
13dBm / 24dBm

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decrease in the same proportion as the
power decreases.
1
1
10dBm / 21dBm
05H
RE
G2
Channel Control (CH)
0-83 respectively represent a total of 84
channels
Actual frequency = 410.125 + CH *1M
06H
Rea
d/wr
ite
RE
G3
7
Enable RSSI bytes
When enabled, the radio receives
wireless data and outputs it through the
serial port TXD, followed by an RSSI
strength byte.
0
disabled (default)
1
Start
6
transfer method
During fixed-point transmission, the
radio will identify the three bytes of
serial port data as: address high + address
low + channel, and use it as the wireless
transmission target.
0
transparent transmission (default)
1
fixed point transmission
5
Relay function
After the relay function is enabled, if the
target address is not the radio itself, the
radio will start a forwarding;
In order to prevent data return, it is
recommended to use in conjunction with
fixed-point mode; that is, the destination
address and the source address are
different.
0
Disable relay function (default)
1
Enable relay function
4
LBT enable
After enabling, the wireless data will be
monitored before transmission, which
can avoid interference to a certain extent,
but may cause data delay;
The maximum stay time of LBT is 2
seconds, and it will be issued forcibly
when it reaches two seconds.
0
disabled (default)
1
Start
3
WOR Mode Transceiver Control
Only valid for mode 1;
After the WOR receiver receives the
wireless data and outputs it through the
serial port, it will wait for 1000ms before
entering the WOR again. During this
period, the user can input the serial port
data and return it through the wireless;
Each serial port byte will refresh 1000ms
time;
The user must initiate the first byte
within 1000ms.
0
WOR receiver (default)
The transceiver is turned on, and when
transmitting data, a wake-up code for a
certain period of time is added.
1
WOR transmitter
The radio cannot transmit data, and
works in WOR monitoring mode. The
monitoring period is shown below
(WOR period), which can save a lot of
power consumption.

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2
1
0
WOR cycle
Only valid for mode 1;
Period T= (1+WOR)*500ms, the
maximum is 4000ms, and the minimum
is 500ms;
The longer the WOR monitoring interval
period, the lower the average power
consumption, but the greater the data
delay;
The sender and receiver must agree (very
important)
0
0
0
500ms
0
0
1
1000ms
0
1
0
1500ms
0
1
1
2000ms
1
0
0
2500ms
1
0
1
3000ms
1
1
0
3500ms
1
1
1
4000ms
07H
Writ
e
CR
YPT
_H
Key high byte (default 0)
write only, read returns 0;
Used for encryption to avoid interception
of air wireless data by similar radio
stations;
The radio will use these two bytes as a
calculation factor to transform and
encrypt the air wireless signal.
08H
Writ
e
CR
YPT
_L
key low byte (default 0)
80H
～
86H
Rea
d
PID
PID Product Information 7 bytes
PID Product Information 7 bytes
6.3 Factory default parameters
Mode
Factory default parameter value：C0 00 00 62 00 00
Radio model
Frequency
Addres
s
Channel
Air rate
baud rate
Serial
format
transmit
power
E95-DTU(900SLxx-48
5)
850.125M
Hz
0x000
0
0x17
2.4kbps
9600
8N1
22dBm (low
power)
30dBm (high
power)

Chengdu Ebyte Electronic Technology Co.,Ltd. E95-DTU(900SLxx-485) User Manual
Copyright ©2012–2022，成都亿佰特电子科技有限公司
17
7.Use of relay networking mode
Number
Relay Mode Description
1
After setting the relay mode through the configuration mode, switch to the general mode,
and the relay starts to work.
2
In relay mode, ADDH and ADDL are no longer used as the radio address, but are forwarded
and paired corresponding to the NETID respectively. If one network is received, it will be
forwarded to the other network. The network ID of the repeater itself is invalid.
3
In repeater mode, the repeater station cannot send and receive data, and cannot perform
low-power operation.
4
When the user enters other modes from mode 3 (sleep mode) or during the reset process, the
radio will reset the user parameters, during which the AUX output is low.
Relay networking rules description:
1.Forwarding rules, the relay can forward data between two NETIDs in both directions.
2. In repeater mode, ADDH\ADDL is no longer used as a radio address, but as a NETID forwarding pairing.如图：
①primary relay
"Node 1" NETID is 08.
"Node 2" NETID is 33.
The ADDH\ADDL of relay 1 are 08 and 33 respectively.
So the signal sent by node 1 (08) can be forwarded to node 2 (33)
At the same time, the addresses of node 1 and node 2 are the same, so the data sent by node 1 can be received by
node 2.
②secondary relay
The ADDH\ADDL of relay 2 are 33 and 05 respectively.
So relay 2 can forward relay 1's data to network NETID: 05.
Therefore, node 3 and node 4 can receive the data of node 1. Node 4 outputs data normally, and node 3 and node 1
have different addresses, so no data is output.
③two-way relay
As shown in the configuration: the data sent by node 1 can be received by nodes 2 and 4, and the data sent by nodes
2 and 4 can also be received by node 1.