Ebyte E95-DTU User manual

E95-DTU(400SL22-485)

Chengdu Ebyte Electronic Technology Co.,Ltd E95-DTU(400SL22-485) User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co.,Ltd
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Contents
1. Introduction ............................................................................................................................................................. 3
1.1 Brief Introduction .......................................................................................................................................... 3
1.2 Features.......................................................................................................................................................... 3
1.3 Quick Start..................................................................................................................................................... 4
1.4 Parts Description............................................................................................................................................ 6
1.5 Size................................................................................................................................................................ 7
2. Interface Description ............................................................................................................................................... 7
2.1 Power interface description ........................................................................................................................... 7
2.2 Communication interface description............................................................................................................ 8
3. Technical Index........................................................................................................................................................ 9
3.1 Model specification ....................................................................................................................................... 9
3.2 General specifications.................................................................................................................................... 9
3.3 Frequency range and channel number........................................................................................................... 9
3.4 Transmit power level ................................................................................................................................... 10
3.5 Air speed class ............................................................................................................................................. 10
3.6 Current parameter ...................................................................................................................................... 10
3.7 Sending and receiving length and data separate method............................................................................. 10
4. Function Details..................................................................................................................................................... 11
4.1 Fixed-point transmission (hexadecimal)...................................................................................................... 11
4.2 Broadcast transmission (hexadecimal) ........................................................................................................ 11
4.3 Broadcast address ........................................................................................................................................ 12
4.4 Listening address......................................................................................................................................... 12
5. Operating mode ..................................................................................................................................................... 12
5.1 Transparent transmission mode (mode 0).................................................................................................... 12
5.2 WOR mode (mode 1)................................................................................................................................... 13
5.3 Configuration mode (mode 2)...................................................................................................................... 13
5.4 Deep sleep mode (mode 3) .......................................................................................................................... 13
6. Register read and write control.............................................................................................................................. 13
6.1 Instruction format ........................................................................................................................................ 13
6.2 Register description..................................................................................................................................... 14
6.3 Factory default parameters........................................................................................................................... 17
7. Relay Network Mode Use ..................................................................................................................................... 17
8. PC Configuration Instructions............................................................................................................................... 18
9. Program the DTU .................................................................................................................................................. 19
10. Connection Diagram in Test and Practical Application....................................................................................... 20
11. Related Products.................................................................................................................................................. 20
12. Practical Application............................................................................................................................................ 21
13. Precautions for Use.............................................................................................................................................. 22
Important Statement .................................................................................................................................................. 23
Revision History........................................................................................................................................................ 23
About us..................................................................................................................................................................... 23

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1. Introduction
1.1 Brief Introduction
E95-DTU (400SL22-485) is a wireless data transmission DTU that uses military-grade LoRa modulation technology. It has a
variety of transmission methods. It works in the 433MHz. The DTU provides a transparent RS485 interface, plastic shell, rail type
installation structure, support 8-28V voltage input. LoRa spread spectrum technology will bring a longer communication distance, and
has the advantage of strong anti-interference ability.
As a communication medium, wireless data transmission station 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 convenience, strong diffraction ability, flexible network structure, and long
coverage. It is suitable for many and scattered locations and complex geographic environments. It can be connected with PLC, RTU,
rain gauge, level gauge and other data terminals.
1.2 Features















Using the latest LoRa technology, it is farther and more powerful than traditional LoRa digital DTU;
With data encryption, and the packet length can be set;
Adopt flame-retardant plastic shell, guide rail type installation structure, convenient and efficient installation
Hidden buttons are used to switch working modes to avoid false triggers, and the equipment is more reliable in operation;
Simple high-efficiency power supply design, support power supply configuration or line pressure mode, support 8 ~ 28V
power supply;
Support LBT function, the DTU automatically waits for transmission according to the current environmental noise
intensity. Greatly improve the communication success rate of the DTU in harsh environments;
Support wireless sending of command data packets, remote configuration or reading of DTU 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℃, adapt to various harsh working environments, 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 DTU;
Powerful software function, all parameters can be set by programming: such as power, frequency, air rate, address ID, etc.;
Ultra-low power consumption, standby current is only 15mA(lower power consumption in power-saving mode and sleep mode);
Built-in watchdog and precise time layout. Once an abnormality occurs, the DTU will automatically restart and continue to work
according to the previous parameter settings.

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1.3 Quick Start
①Prepare two E95-DTU (400SL22-485)
②First install the antenna for the digital DTU, and then install the power supply. The user selects the power adapter for
power supply according to the needs.
③Use USB to RS-485 or other methods to connect the computer to the digital DTU;

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④Start two serial port debugging assistants, select the serial port baud rate to be 9600bps (default), and the check method to
be 8N1 to make serial port transparent transmission;
⑤If the customer needs to switch the working mode, it can be controlled by the Mode button to switch between different
working modes (M0 indicator, M1 indicator). Press and hold the Mode button for about 1 S and then release it to switch
modes. The mode switching details are shown in the table below:
No.
Type
M1
M0
Description
Mode 0
Transparent
Transmission
Mode
Light
Off
Light
Off
Serial port open, wireless open, transparent transmission (factory
default mode), support special command air configuration
Mode 1
WOR Mode
Light
Off
Light
On
Can be defined as WOR sender and WOR receiver, support air wakeup
Mode 2
Configuration
Mode
Light
On
Light
Off
The user accesses the register through the serial port to control the
working status of the DTU. The user can configure the DTU through
the computer configuration software.
Mode 3
Deep Sleep
Mode
Light
On
Light
On
DTU goes to sleep mode
Note: The DTU has a power-down save mode function (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).

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1.4 Parts Description
No.
Name
Function
Description
1
Mode
Mode switch button
Working mode switching control
2
ANT
RF interface
SMA-K，External thread inner hole
3
DC
Power supply
DC power input port, pressure line port
4
RS485
RS485 interface
Standard RS-485 interface
5
PWR
Power indicator
Lights up when the power is on
6
TXD
Sending indicator
Flashes when sending data
7
RXD
Receiving indicator
Flashes when receiving data
8
MO
Mode indicator
Working mode indicator
9
M1
Mode indicator
Working mode indicator

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1.5 Size
2.Interface Description
2.1 Power interface description
E95-DTU can be powered by 8～28V DC power supply, it is recommended to use 12V or 24V DC power supply. The wiring port
adopts wiring terminal (2 Pin) connection.
Unit: mm

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2.2 Communication interface description
E95-DTU can use 3.81 terminal block to connect with equipment through RS-485.
No.
Standard
definition
Function
Description
1
G
signal ground
Anti-interference, grounding
2
A
RS-485 bus A interface
RS-485 A interface is connected to device A interface
3
B
RS-485 bus B interface
RS-485 B interface is connected to device B interface
★Note: The communication is not smooth when connecting the DTU to multiple devices, but there is no such phenomenon in a
single device. Please try to connect a 120Ω resistor in parallel between the 485_A terminal and the 485_B terminal.

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3.Technical Index
3.1 Model specification
Model
Working
Frequency
Distance Specifications Recommended
Application Scenarios
Hz
km
E95-DTU(400SL22-485)
5
LoRa Spread
spectrum
anti-interference
Suitable for
environments with long
distances and susceptible
to interference
★Note: Sunny, open environment without obstruction, 12V/1A power supply, 5dBi suction antenna, antenna height 2 meters from
the ground, use factory default parameters.
3.2 General specifications
No.
Term
Specification
Description
1
Size
92*67*30 mm
Review installation dimensions for details
2
Weight
95 g
Weight tolerance 5g
3
Working
Temperature
-40℃～+85℃
Meet the needs of industrial use
4
Voltage Range
8～28V DC
Recommend to use 12V or 24V
5
Interface
RS485
3.81 terminal block
6
Baud Rate
Default 9600
Baud rate range 1200～115200
7
Address Code
Default 0
A total of 65536 address codes can be set
3.3 Frequency range and channel number
Model
Default
Frequency
Frequency Range
Channel
Spacing
Number of Channels
Hz
Hz
Hz
E95-DTU(400SL22-485)
433MHz 433MHz
1M
1，Half Duplex
Note: In the same area, multiple groups of digital DTUs are used for one-to-one communication at the same time. It is
recommended that each group of digital DTUs set the channel spacing above 2MHz.
433MHz

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3.5 Air speed class
Model
Default Air
Rate Level Air Speed Class
bps bps
E95-DTU(400SL22-485) 2.4k 8 0.3、1.2、2.4、4.8、9.6、19.2、38.4、62.5k
★Note: The higher the air speed setting, the faster the transmission rate and the shorter the transmission distance; therefore, when
the speed meets the requirements of use, it is recommended that the airspeed be as low as possible.
3.6 Current parameter
Model Transmitting Current mA Waiting Current mA
12V 24V 12V 24V
E95-DTU(400SL22-485) 45 26 10 7
★Note: It is recommended to reserve more than 50% of the current margin when selecting the power supply, which is conducive to
the long-term stable operation of the DTU.
3.7 Sending and receiving length and data separate method
Model Cache Size Data Separate Method
E95-DTU(400SL22-485) 1000 Bytes Data can be separated sent with 32/64/128/240 bytes by
command
★Note:
1. If the DTU’s single received data is greater than the single packet capacity, the excess data will be automatically allocated to the
second transmission until the transmission is completed;
2. The single received data of the DTU cannot be larger than the buffer capacity.

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4. Function Details
4.1 Fixed-point transmission (hexadecimal)
4.2 Broadcast transmission (hexadecimal)

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4.3 Broadcast address
Example: Set the address of DTU A to 0xFFFF and the channel to 0x04.
When DTU A is used as a transmitter (same mode, transparent transmission mode), all receiving DTU under the 0x04 channel
can receive data to achieve the purpose of broadcasting.
4.4 Listening address
Example: Set the address of DTU A to 0xFFFF and the channel to 0x04.
When DTU Ais receiving, it can receive all the data under channel 0x04 to achieve the purpose of monitoring.
5. Operating mode
E95-DTU has four working modes. When there is no demanding low power consumption requirement, it is recommended to configure
the DTU to transparent transmission mode (mode 0) if normal communication is required;
The default setting of the DTU at the factory is transparent transmission mode (mode 0).
No.
Type
M1
M0
Description
Mode 0
Transparent
transmission
mode
Light
Off
Light
Off
Serial port open, wireless open, transparent transmission
(factory default mode), support special command air
configuration.
Mode 1
WOR Mode
Light
Off
Light
On
Can be defined as WOR sender and WOR receiver, support air
wakeup
Mode 2
Configuration
Mode
Light
On
Light
Off
The user accesses the register through the serial port to control
the working status of the DTU. The user can configure the DTU
through the upper computer configuration software.
Mode 3
Deep Sleep
Mode
Light
On
Light
On
DTU goes to sleep mode.
Note: If there is no low power consumption requirement, no need to care about WOR mode (mode 1).
5.1 Transparent transmission mode (mode 0)
Type
When the M0 indicator light is off and the M1 indicator light is off, the DTU is working in mode 0
Sending
Users can input data through the serial port, and the DTU will start wireless transmission.
Receiving
The DTU receiving function is turned on, and after receiving the wireless data, it will be output through the
serial port TXD pin.

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5.2 WOR mode (mode 1)
Type
When the M0 indicator light is on and the M1 indicator light is off, the DTU is working in mode 1
Sending
When defined as the transmitter, the wake-up code for a certain period of time will be automatically added
before transmission
Receiving
Data can be received normally, and the receiving function is equivalent to mode 0
5.3 Configuration mode (mode 2)
Type
When the M0 indicator light is off and the M1 indicator light is on, the DTU is working in mode 2
Sending
Can be configured wirelessly
Receiving
Can be configured wirelessly
Configurating
The user can access the register to configure the working status of the radio
5.4 Deep sleep mode (mode 3)
Type
When the M0 indicator light is on and the M1 indicator light is on, the DTU is working in mode 3
Sending
Unable to transmit data wirelessly.
Receiving
Unable to receive data wirelessly.
6. Register read and write control
6.1 Instruction format
In configuration mode (mode 2: M1 indicator light is on, M0 indicator light is off), the supported command list is as follows (when
setting, only 9600, 8N1 format is supported):

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No.
Instruction
Format
Detailed Description
1
Set Register
Command: C0+start address+length+parameter
C1+start address+length+parameter
Example 1: Configure the channel as 0x09
Instruction 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),
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
Command: C1+start address+length
Response: C1+start address+length+parameter
Example 1: Read the channel
Instruction Start Address Length Parameter
Send：C1 05 01
Return：C1 05 01 09
Example 2: Read the DTU address, network address, serial port, airspeed at the same time
Send：C1 00 04
Return：C1 00 04 12 34 00 61
3
Set Up
Temporary
Register
Command: C2 + start address + length + parameters
Response: C1 + start address + length + parameters
Example 1: Configure the channel as 0x09
Instruction Start Address Length Parameter
Send：C2 05 01 09
Return：C1 05 01 09
Example 2: Configure the DTU address (0x1234), network address (0x00), serial port (9600 8N1),
airspeed (1.2K) at the same time
Send：C2 00 04 12 34 00 61
Return：C1 00 04 12 34 00 61
5
Wireless
Configuration
Instructions: CF CF + regular instructions
Response: CF CF + regular response
Example 1: The 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 DTU address (0x1234), network address (0x00), serial port (9600
8N1), 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
Format Error
Format Error Response
FF FF FF
6.2 Register description
No.
Read and
Write
Name
Description
Remarks
00H
Read/Write
ADDH
ADDH（Default 0）
High byte and low byte of radio address;
Note: When the DTU address is equal to FFFF, it can be used as the
broadcast and monitor address, that is: the DTU will not perform address
filtering at this time
01H
Read/Write
ADDL
ADDL（Default 0）

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02H
Read/Write
NETID
NETID（Default 0）
Network address, used to distinguish networks;
When communicating with each other, they should be set to the same.
03H
Read/Write
REG0
7
6
5
UART serial port rate (bps)
For two DTUs 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
congestion caused by the same baud rate, and
may even be lost;
It is generally recommended that the baud
rate of the two communication parties be the
same.
0
0
0
The serial port baud rate is 1200
0
0
1
The serial port baud rate is 2400
0
1
0
The serial port baud rate is 4800
0
1
1
The serial port baud rate is 9600
（default）
1
0
0
The serial port baud rate is 19200
1
0
1
The serial port baud rate is 38400
1
1
0
The serial port baud rate is 57600
1
1
1
The serial port baud rate is 115200
4
3
Serial parity bit
The serial port mode of the two
communication parties can be different;
0
0
8N1（default）
0
1
8O1
1
0
8E1
1
1
8N1（等同 00）
2
1
0
Wireless air rate (bps)
The air rate of both parties must be the same;
The higher the air rate, the smaller the delay
and the shorter the transmission distance.
0
0
0
Air speed 0.3k
0
0
1
Air speed 1.2k
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
Read/Write
REG1
7
6
Data Packet Separate setting
The data sent by the user is less than the data
packet separate length, and the serial port
output of the receiving end appears as an
uninterrupted continuous output;
If the data sent by the user is larger than the
data packet separate length, the serial port of
the receiving end will be output in packets.
0
0
240 Bytes（default）
0
1
128 Bytes
1
0
64 Bytes
1
1
32 Bytes
5
RSSI Environmental noise enable
After enabling, you can send commands C0
C1 C2 C3 in transmission mode or WOR
sending mode to read registers;
Register 0x00: Current environmental noise
RSSI;
Register 0X01: RSSI when receiving data last
time
(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 effective value; for example: send C0 C1
C2 C3 00 01
Return C1 00 01 RSSI
0
Disabled (default)
1
Enable
4
3
2
Remain

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The relationship between power and current
is non-linear, and the power supply has the
highest efficiency at maximum power;
The current will not decrease in the same
proportion as the power decreases.
05H
Read/Write
REG2
Channel Control (CH)
1Actual frequency = 433MHz
06H
Read/Write
REG3
7
Enable RSSI byte
After being enabled, the DTU receives
wireless data and outputs it through the serial
port TXD, followed by an RSSI strength byte.
0
Disabled (default)
1
Enable
6
Transfer method
During fixed-point transmission, the DTU
will recognize the three bytes of serial data
as: address high + address low + channel, and
use it as a 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 DTU itself, the DTU
will start a forwarding;
In order to prevent data from returning, it is
recommended to use it in conjunction with
the fixed-point mode; that is, the destination
address is different from the source address.
0
Disable relay function (default)
1
Enable relay function
4
LBT Enable
After enabling, monitoring will be conducted
before wireless data 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
2 seconds.
0
Disabled (default)
1
Enable
3
WOR Mode send and receive control
Only valid for mode 1;
After the WOR receiver receives the wireless
data and outputs it through the serial port, it
will wait 1000ms before entering the WOR
again. The user can input the serial port data
during this period and return it via wireless;
Each serial port byte will be refreshed for
1000ms;
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 DTU cannot transmit data, and it works in
WOR monitoring mode. The monitoring period is
shown below (WOR period), which can save a lot
of power consumption.
2
1
0
WOR Cycle
Only valid for mode 1;
Cycle T= (1+WOR)*500ms, the maximum is
4000ms, the minimum is 500ms;
The longer the WOR monitoring interval
period, the lower the average power
consumption, but the greater the data delay;
Both 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

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1
1
1
4000ms
07H
Write
CRYPT
_H
High byte of key
(default 0)
Only write, read returns 0;
Used for encryption to avoid interception of wireless data in the air by
similar DTUs;
The DTU will use these two bytes as a calculation factor to transform and
encrypt the air wireless signal.
08H
Write
CRYPT
_L
Low byte of key
(default 0)
80H
～
86H
Read
PID
Product information 7
bytes
Product information 7 bytes
7.Relay Network Mode Use
No.
Relay mode description
1
After setting the relay mode through the configuration mode, switch to the normal mode and the relay starts
to work.
2
In relay mode, ADDH and ADDL are no longer used as radio addresses, but correspond to NETID
forwarding and pairing respectively. If one network is received, it will be forwarded to another network.
The network ID of the repeater itself is invalid.
3
In the relay mode, the relay 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 is in the reset process, the radio will reset
the user parameters, during which AUX outputs low level.
Description of relay networking rules:
1、Forwarding rules, the relay can forward data in both directions between two NETIDs.
2、In the relay mode, ADDH\ADDL is no longer used as a DTU address, but as a NETID forwarding pairing.
As shown:
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, node 1 and node 2 have the same address, so the data sent by node 1 can be received by node 2.

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②Secondary relay
The ADDH\ADDL of relay 2 are 33 and 05 respectively.
So, Relay 2 can forward the data of Relay 1 to the network NETID: 05.
Therefore, node 3 and node 4 can receive node 1 data. Node 4 normally outputs data, and node 3 has a different address from node 1,
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.
8. PC Configuration Instructions
The following figure shows the display interface of the E95-DTU (400SL22-485) configuration host computer. The user can
switch to the configuration mode through the MODE button, and quickly configure and read the parameters on the host
computer.

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In the configuration of the host computer, the DTU address, frequency channel, network ID, and key are all in decimal display
mode, and the value range of each parameter:
Network Address: 0～65535
Frequency Channel: 1
Network ID：0～255
Key: 0～65535
When using the host computer to configure the relay mode, the user needs to pay attention. Since the parameters in the host
computer are in decimal display mode, the DTU address and network ID need to be converted when filling in. If the network ID
input by the transmitting terminal A is 02, and the network ID input by the receiving terminal B is 10, when the relay terminal R
sets the radio address, the hexadecimal value 0X020A is converted to the decimal value 522 as the relay terminal R. Radio
address. That is, the radio address value that needs to be filled in by the relay terminal R at this time is 522.
9.Program the DTU
Operating
Mode
M1
M0
Remark
Configuration
mode
Light On
Light Off
Only use the configuration software to program the DTU in the
current mode
1、Programming can only be carried out in a specific working mode (see the above table). If the programming fails, please
confirm whether the working mode of the DTU is correct.
2、If you don't need complicated programming to open the E95-DTU (400SL22-485) configuration software, you can modify the
relevant parameters.

Chengdu Ebyte Electronic Technology Co.,Ltd E95-DTU(400SL22-485) User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co.,Ltd
20
10. Connection Diagram in Test and Practical Application
11. Related Products
Model
Interfac
e Type
Frequency Hz
Transmit
power
dBm
Distance
km
Features
E95-DTU(400SL30-485)
RS485
410.125/493.125M
30
10
Cost-effective LoRa, Rail Type, RS232,
E90-DTU SL series intercommunication
E95-DTU(400F20-485)
RS485
410/510M
20
1
Ultra-low price digital DTU, Rail Type,
RS485,, E90-DTU F series
intercommunication
E95-DTU(433L20-485)
RS485
410/441M
20
3
Cost-effective LoRa, Rail Type, RS485,
E90-DTU L series intercommunication
E95-DTU(433L30-485)
RS485
410/441M
30
8
Cost-effective LoRa, Rail Type, RS485,
E90-DTU L series intercommunication
E95-DTU(433L20-232)
RS232
410/441M
20
3
Cost-effective LoRa, Rail Type, RS232,
E90-DTU L series intercommunication
E95-DTU(433L30-232)
RS232
410/441M
30
8
Cost-effective LoRa, Rail Type, RS232,
E90-DTU L series intercommunication
E95-DTU(400F20-232)
RS232
410/510M
20
1
Ultra-low price digital DTU, Rail Type,
RS232,, E90-DTU F series
intercommunication
E95-DTU(400SL22-232)
RS232
410.125/493.125M
22
5
Cost-effective LoRa, Rail Type, RS232,
E90-DTU SL series intercommunication
E95-DTU(400SL30-232)
RS232
410.125/493.125M
30
10
Cost-effective LoRa, Rail Type, RS232,
E90-DTU SL series intercommunication