Ebyte E90-DTU User manual

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(900SL33) User Manual
Copyright © 20122022, Chengdu YiBai Te Electronic Technology Co., LTD
1
E90-DTU(900SL33)

Chengdu Ebyte Electronic Technology Co.,Ltd. E90-DTU(900SL33) User Manual
Copyright ©2012–2023，Chengdu Ebyte Electronic Technology Co.,Ltd.
2
Contents
Disclaimer .......................................................................................................................................................................4
1 Introduction................................................................................................................................................................. 5
1.1 Brief Introduction .............................................................................................................................................5
1.2. Certificates .......................................................................................................................................................5
1.3. Features............................................................................................................................................................5
2. Quick start ...................................................................................................................................................................6
3. Installation size...........................................................................................................................................................9
3.1 Department instructions................................................................................................................................... 9
4. Interface definition ................................................................................................................................................... 11
4.1 Power interface description ............................................................................................................................11
4.2 RS232 Interface definition............................................................................................................................. 11
4.3 RS485 Interface definition............................................................................................................................. 11
5. Qualification ............................................................................................................................................................. 12
5.1 Model Specifications......................................................................................................................................12
5.2 General specification parameters ................................................................................................................... 12
5.3 Frequency range and channel number ........................................................................................................... 13
5.4 Transmit power level......................................................................................................................................13
5.5 Air rate grade..................................................................................................................................................13
5.6 Current parameters ......................................................................................................................................... 13
5.7 Receiving length and subcontracting method ................................................................................................14
6 Function introduction................................................................................................................................................ 14
6.1 Fixed point transmission (hexadecimal) ........................................................................................................ 14
6.2 Broadcast transmission (hexadecimal)...........................................................................................................15
6.3 Broadcast address...........................................................................................................................................15
6.4 Listening address............................................................................................................................................15
7. Working mode .......................................................................................................................................................... 15
7.1 General Mode (Mode 0) .................................................................................................................................16
7.2 WOR Mode (Mode 1).................................................................................................................................... 16
7.3 Configuration mode (Mode 2)....................................................................................................................... 17
7.4 Depth sleep mode (mode 3)........................................................................................................................... 17
8. Register read/write and control ................................................................................................................................ 17
8.1 Command format ............................................................................................................................................17
8.2 Register description........................................................................................................................................18
8.3 Factory default parameters .............................................................................................................................21
9. AT command.............................................................................................................................................................22
9.1 AT commands list........................................................................................................................................... 22
9.2 AT parameter analysis .................................................................................................................................... 24
9.3 Notes for serial port upgrade firmware ..........................................................................................................24
10. Relay mode .............................................................................................................................................................25
11. Description of the configuration software ..............................................................................................................26
12. Configure device .................................................................................................................................................... 27
12.1. Connection diagram .................................................................................................................................... 27

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13.Connection diagram................................................................................................................................................ 28
14. Related products ..................................................................................................................................................... 28
15. Practical application fields..................................................................................................................................... 29
16. Using Tips ...............................................................................................................................................................30
Revise the history......................................................................................................................................................... 31
About us ........................................................................................................................................................................31

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Copyright © 20122022, Chengdu YiBai Te Electronic Technology Co., LTD
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Disclaimer
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.

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1 Introduction
1.1 Brief Introduction
E90-DTU (900SL33) is a wireless digital transmission station using military LoRa modulation technology, with a
variety of transmission modes, working in 850.125~930.125MHz) frequency band (default 868.125MHz). The station
provides transparent RS232 / RS485 interface and supports 8~28V voltage input. LoRa direct sequence expansion
technology will bring further communication distance, and has the advantages of concentrated power density and strong
anti-interference ability. The module has the software FEC forward error correction algorithm, which has high coding
efficiency and strong error correction ability. In the case of sudden interference, it can actively correct the disturbed data
packets, greatly improving the reliability and transmission distance. In the absence of FEC, such packets can only be
discarded. The radio station has the function of data encryption, and the data transmitted by the radio station is random,
which makes the data interception meaningless through strict encryption and decryption algorithm; supports the
subcontracting length setting and supports different real-time and data packets.
Wireless digital radio as a kind of communication media, and optical fiber, microwave, open line, have certain scope
of application: it provides some special conditions of private network monitoring signal of real-time and reliable data
transmission, with low cost, convenient installation and maintenance, shooting ability, flexible network structure, far
coverage characteristics, suitable for point and scattered, complex geographical environment, and PLC, RTU, rainfall
gauge, liquid level meter data terminal connection.
1.2. Certificates
E90-DTU has obtained the "Radio Transmitter Equipment Model Approval Certificate" with the approval code:
CMII T ID: 2017FP5780.
E90-DTU has obtained the "Explosion-proof Certificate" with its number: Test Word No.201711000975.
E90-DTU has obtained the "Electrostatic Surge Detection Report" issued by the China National Test Institute,
whose number is: CNEx18.1461.
E90-DTU has obtained the "Design Patent Certificate", and its patent number is: ZL 2016 3 0501980.3.
E90-DTU has obtained the "Utility Model Patent Certificate", and its patent number is: ZL 2016 2 1410691.3.
E90-DTU has obtained the "CE Certificate" (EU mandatory certification) with the verification number:
CCISE180514601V.
E90-DTU has obtained the "FCC Certificate" (certified by the FCC), with its ID: 2 ALPH-E90-DTU.
E90-DTU has obtained the "RoHS Certificate" (EU mandatory environmental certification) with the report number:
DTI201807025245.
1.3. Features
★Using the latest Lo R a technology, than the traditional Lo R a digital radio distance is farther, more powerful
performance;
★Support AT instruction, more convenient to use;

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★Support serial port upgrade firmware, update firmware is more convenient;
★Under ideal conditions, the communication distance can reach 16km;
★Support for the global license-free ISM 868 / 915 MHz frequency band;
★Support data encryption, the subcontract length can be set;
★Super large single package, single package support up to 240 bytes, suitable for Modbus protocol;
★Simple efficient power supply design, support power supply device or voltage mode, support 8~28V power supply;
★Launch power up to 2W, and support multi-stage adjustable, all technical indicators meet the European industrial
standards;
★Support LBT function, the station automatically sends according to the current ambient noise intensity. Greatly
improve the communication success rate of the module in the harsh environment;
★Support wireless sending command packet, remote configuration or reading wireless module parameters;
★Support the communication key function, and effectively prevent the data from being intercepted;
★It can realize the multi-stage relay networking, effectively expand the communication distance, and realize the
ultra-long distance communication;
★Using the temperature compensation circuit, the frequency stability is better than ± 1.5 PPM;
★Working temperature range: -40℃ ~ + 85℃, adapt to a variety of harsh working environment, real industrial-grade
products;
★Aluminum alloy shell, compact volume, convenient installation, good heat dissipation; perfect shielding design,
good electromagnetic compatibility, strong anti-interference ability;
★Power reverse connection protection, adoptive protection, antenna surge protection and other multiple protection
functions, greatly increase the reliability of the station;
★Powerful software functions, all parameters can be programmed by setting: such as power, frequency, air rate,
address ID, etc.;
★Ultra-low power consumption, waiting current is only 15 mA (power saving mode and sleep mode power
consumption is lower);
★Built-in watchdog, and precise time layout, in the event of abnormalities, the module will automatically restart, and
can continue to work according to the previous parameter settings.
2. Quick start
You need to prepare
1、First, install the antenna to the digital radio, and then install the power supply, and ensure that the dial switch status
is correct, the user according to the demand to choose the voltage line mode or power adapter power supply, the two

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can choose one;
2、Use USB to RS-232, USB to RS-485, or other means to connect the computer to the digital radio station;
3、Start two serial port debugging assistants, select serial port port rate is 9600bps, check mode is 8N1, can realize
serial port transmission;

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4、If the customer needs to modify the parameters, please dial the radio station in the configuration mode and connect it
to the computer. Open the E90-DTU radio station configuration software to modify the relevant parameters. After
completing the configuration, always restore the dial switch status before communication.
Mode 0 factory default state mode 2 for parameter configuration

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3. Installation size
3.1 Department instructions
Pin No.
Name
Function
Description
1
The DB-9
master-type socket
The RS-232
interface
Standard RS-232 interface
2
3.81 Terminal
terminal
RS-485, power
supply interface
Standard RS-485 interface and cable power
interface
3
PWR-LED
Power light
Red, light on when the power is on
4
TXD-LED
Send indicator light
Yellow, blinking when sending the data
5
RXD-LED
Codan lamp
Yellow, flashing when receiving the data
6
DC power interface
Power interface
Straight inserted round hole, outer diameter of
5.5mm and inner diameter of 2.5mm
7
Dial switch
Dial switch
Work mode control
8
Antenna interface
SMA-K joggle
Outer thread and inner hole, 10mm long,
characteristic impedance of 50 Ω

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unit:mm

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4. Interface definition
4.1 Power interface description
Users can choose ⑥DC power interface power supply, using the interface for 5.5mm outer diameter, 2.5mm inner
diameter power adapter power supply;
VCC terminal and GND terminal in ②can also power supply, only choose any power supply mode;
The E90-DTU can be powered from an 8 to 28 V DC power supply, with a 12V or 24V DC power supply recommended.
4.2 RS232 Interface definition
The E90-DTU can be connected to the device via the RS-232 using the standard DB-9 interface.
4.3 RS485 Interface definition
E90-DTU can be connected separately using the terminal 485_A and terminal 485_B in ②to the B terminal A of RS-485
of the device.
PIN No
Definition
Function
Description
1
VCC
Line-pressing power supply
interface, positive electrode
DC 8 to 28 V, 12V or 24V
2
GND
Press line type power
The power supply negative electrode is connected

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interface, negative electrode
to the system ground and housing
3
485_B
RS-485 interface, B interface
The RS-485 Interface B interface is connected to
the device B interface
4
485_A
RS-485 interface, A interface
The RS-485 interface A interface is connected to
the device A interface
★Note: When the radio station is connected to multiple devices, but not with a single device, try to parallel 120 Ω
resistance between terminal 485_A and 485_B terminals.
5. Qualification
5.1 Model Specifications
Model
Frequency
Power
Distance
Specification
Recommend application
scenarios
Hz
W
km
E90-DTU(900SL
33)
868.125MH
z
2
16
LoRa amplification
of anti-interference
Suitable for distant, easily
disturbed environments
★Note: In sunny weather, no shelter in the open environment, 12V / 2A power supply, 5 dBi suction cup antenna, the
antenna is 2 meters away from the ground height, using the factory default parameters.
5.2 General specification parameters
PIN No
Definition
Function
Description
1
product size
82*62*25 mm
See installation size for details
2
Product weight
150g
Weight tolerance of 4.5g
3
working
temperature
-40℃～+85℃
Meet the needs of industrial-grade use
4
antenna
impedance
50Ω
Standard 50 Ω characteristic impedance
5
voltage range
8～28V DC
Either 12V or 24V is recommended
6
communication
interface
RS232/RS485
Standard DB9 hole type / 3.81 terminal
7
Baud rate
Factory default: 9600
The Baud rate range from 1200 to 115200
8
address code
Factory default 0
A total of 65,536 address codes can be set

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5.3 Frequency range and channel number
Model
Default
Frequency
Band Range
Channel
Spacing
Description
Hz
Hz
Hz
E90-DTU(900SL33)
868.125MHz
850.125～
930.125MHz
1M
81, Half duplex
★Note: In the same area, multiple sets of transmission stations are used to communicate one to one at the same time. It
is suggested that the channel interval be set above 2 MHz.
5.4 Transmit power level
Model
2W
1W
500m W
250m W
E90-DTU(900SL33)
Factory default
√
√
√
★Note: The lower the transmission power is, the closer the transmission distance is, but the working current will not
decrease in the same proportion, so it is recommended to use the maximum transmission power.
5.5 Air rate grade
Model
Default
Equal series
Air rate grade
bps
bps
E90-DTU(900SL33)
2.4k
6
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 closer the transmission distance; so if
the rate meets the usage requirements, the lower the air speed, the better.
5.6 Current parameters
Model
Emission current mA
Waiting current mA
12V
24V
12V
24V
E90-DTU(900SL33)
650
330
10
6
★Note: It is recommended to retain more than 50% of the current margin when selecting the power supply, which is
conducive to the long-term and stable operation of the radio station.

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5.7 Receiving length and subcontracting method
Model
Cache size
Subcontracting method
E90-DTU(900SL33)
1000 Bytes
Can be sent by instruction subcontracting 32 / 64 /
128 / 240 bytes
★Note: 1. If the single data received by the radio station is greater than the single package capacity, the excess part of
the data will be automatically allocated to the second transmission until the transmission is completed;
2. The single received data should not be greater than the cache capacity.
6 Function introduction
6.1 Fixed point transmission (hexadecimal)

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6.2 Broadcast transmission (hexadecimal)
6.3 Broadcast address
Example: Set module A address to 0xFFFF and channel to 0x04.
When module A is used as transmission (the same mode, transparent transmission mode), all the receiving modules
under the 0x04 channel can receive data to achieve the purpose of broadcasting.
6.4 Listening address
Example: Set module A address to 0xFFFF and channel to 0x04.
When module A is received as, all the data under the 0x04 channel to achieve the purpose of monitoring.
7. Working mode
E90-DTU has four working modes. When there is no harsh low power consumption demand, it is recommended to
configure the radio station as a general mode (mode 0);
The default setting of the station is general mode (mode 0).

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Name
M1
M0
Description
Mode 0
General mode
ON
ON
Serial port open, wireless open, transparent transmission
(factory default mode), support special command air
configuration.
Mode 1
WOR mode
ON
OFF
Can be defined as WOR sender and WOR receiver, support
aerial wake up
Mode 2
Configuration
mode
OFF
ON
The user accthe register through the serial port to control
the working status of the station. The user can configure the
module through the upper computer configuration software.
Mode 3
Deep sleep
mode
OFF
OFF
The station entered hibernation
★Note: If no low power requirements, no concern about WOR mode (mode 1).
7.1 General Mode (Mode 0)
Type
When M 0 = ON and M 1 = ON, the module works in mode 0
send
The user can enter the data through the serial port, and the module will initiate the wireless transmission.
receive
The wireless receiving function of the module is turned on, and it is output through the serial port TXD pin after
receiving the wireless data.
7.2 WOR Mode (Mode 1)
Type
When M 0 = OFF and M 1 = ON, the module works in mode 1
send
When defined as the transmitting side, the wake-up code is automatically added for a certain time before launch
receive
Data can be received normally, and the receiving function is equivalent to mode 0

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7.3 Configuration mode (Mode 2)
Type
When M 0 = ON and M 1 = OFF, the module works in mode 2
send
Wireless launch closed
receive
Wireless receive closed
configure
The user can access the register to configure the module operating state
7.4 Depth sleep mode (mode 3)
Type
When M 0 = OFF and M 1 = OFF, the module works in mode 3
send
Unable to transmit the wireless data.
receive
Unable to receive the wireless data.
pay attention to
When entering from the hibernation mode to the other mode, the module will reconfigure the parameters, and the
AUX remains low during the configuration process;
After the output high level, it is recommended that the user detect the T _ BUSY rising edge.
8. Register read/write and control
8.1 Command format
Under the configuration mode (mode 2: M 1 = OFF, M 0 = ON), the supported instruction list is as follows (when
setting, only 9600,8N1 format is supported):
No
Instruction
format
Define
1
Set the register
Instructions: C0 + starting address + length + parameter
Response: C1 + starting address + length + parameter
Example 1: The configuration channel is 0x09
Command start address length parameter
Send to: C0 05 01 09
Return: C1 05 01 09
Example 2: simultaneously configure the module address (0x1234), network address
(0x00), serial port (9600 8N1), empty speed (2.4K)
Send to: C0 00 04 12 34 00 60
Return: C1 00 04 12 34 00 60

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2
Read the register
Instructions: C1 + starting address + length
Response: C1 + starting address + length + parameter
Example 1: Read the access channel
Command start address length parameter
Send to: C1 05 01
Return: C1 05 01 09
Example 2: Read the module address, network address, serial port, and empty speed
simultaneously
Send to: C1 00 04
Return: C1 00 04 12 34 00 60
3
Set up the
temporary register
Instructions: C2 + starting address + length + parameter
Response: C1 + starting address + Length + parameter
Example 1: The configuration channel is 0x09
Command start address length parameter
Send to: C2 05 01 09
Return: C1 05 01 09
Example 2: simultaneously configure the module address (0x1234), network address
(0x00), serial port (9600 8N1), empty speed (2.4K)
Send to: C2 00 04 12 34 00 60
Return: C1 00 04 12 34 00 60
4
Wireless
configuration
Instruction: CF CF + General instruction
Response: CF CF + conventional response
Example 1: The wireless configuration channel is 0x09
Wireless command header command starting address length parameter
Send to: CF CF C0 05 01 09
Return: CF CF C1 05 01 09
Example 2: wireless simultaneous configuration module address (0x1234), network
address (0x00), serial port (9600 8N1), and airspeed (2.4K)
Send to: CF CF C0 00 04 12 34 00 60
Return: CF CF C1 00 04 12 34 00 60
5
format error
Format error response
FF FF FF / “=ERR ”
8.2 Register description
No.
Read-
write
Name
Description
Remarks
00H
Read /
write
ADDH
ADDH (default 0)
Module address of high and low bytes;
Note: When the module address is equal to
FFFF, it can be used as a broadcast and
listening address, that is, the module will not
filter the address
01H
Read /
write
ADDL
ADDL (default 0)
02H
Read /
write
NETID
NETID (default 0)
Network address, used to distinguish
networks;
When communicating with each other, set it
as the same.
03H
Read /
REG0
7
6
5
UART Serial Rate (bps)
The two modules of mutual communication,

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write
the serial port port rate can be different, the
calibration mode can also be different;
When large data packets are launched
continuously, users need to consider the data
blocking caused by the same port rate, or
may even be lost;
It is generally recommended that the two
parties should be the same.
0
0
0
The serial port port rate is
1200
0
0
1
The serial port port rate is
2400
0
1
0
The serial port port rate is
4800
0
1
1
Serial port port rate of 9600
(default)
1
0
0
The serial port port rate is
19200
1
0
1
The serial port port rate is
38400
1
1
0
The serial port port rate is
57600
1
1
1
The serial port port rate is
115200
4
3
Serial check bit
The communication two sides serial port
mode can be different;
0
0
8N1 (by default)
0
1
8O1
1
0
8E1
1
1
8N1 (equivalent to 00)
2
1
0
Wireless aerial rate (bps)
Both parties to communicate, the air rate,
must be the same;
The higher the air rate, the smaller the delay,
and a shorter the transmission distance.
0
0
0
Aerial rate of 2.4k (default)
0
0
1
The air rate is 4.8k
0
1
0
The air rate is 9.6k
0
1
1
Aerial rate 19.2k
1
0
0
Aerial rate 38.4k
1
0
1
Aerial rate 62.5k
04H
Read /
write
REG1
7
6
Subcontract setting
The data sent by the user is less than the
subcontract length, and the serial port output
of the receiving end is presented as
uninterrupted continuous output;
If the data sent by the user is greater than the
subcontract length, the serial port of the
receiving end will subcontract the output.
0
0
240 bytes (by default)
0
1
128 Bytes
1
0
64 Bytes
1
1
32 Bytes
5
The RSSI ambient noise is enabled
When enabled, instruction C0 C1 C2 C3 can
read register in transmission mode or WOR
transmission mode;
Register 0x00: current ambient noise RSSI;
Register 0X01: RSSI last received
(The current channel noise is: dBm = -
(256-RSSI));
Instruction format: C0 C1 C2 C3 + starting
address + read length;
Return: C1 + address + read length + read
valid value; like send C0 C1 C2 C3 00 01
Return to C1 00 01 RSSI (address only starts
0
Disable (default)
1
start using

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from 00)
4
Software mode switching
If we use our upper position computer
configuration parameters, we will actively
close the bit. If you do not want to use M0
M1 pins to switch working mode, you can
enable this function, use specific serial
instructions to switch mode.
Format: C0 C1 C2 C3 02 + working mode
Send C0 C1 C2 C3 02 00 to transmission
mode
The Send C0 C1 C2 C3 02 01 is switched to
the WOR mode
Send the C0 C1 C2 C3 02 02 to switch to the
configuration mode
Send the C0 C1 C2 C3 02 03 to switch to the
sleep mode
Return: C1 C2 C3 02 + working mode
Note: When this function is enabled, only
9600 baud rate is supported in WOR mode
and sleep mode.
0
Disable (default)
1
start using
3
2
continue to have
1
0
transmitting power
Power and current are nonlinear
relationship, when the maximum power, the
power supply efficiency is the highest;
The current will not decrease in equal
proportion with the power decrease.
0
0
33 dBm (by default)
0
1
30d B m
1
0
27d B m
1
1
24d B m
05H
Read /
write
REG2
Channel Control (CH)
0-80 represents a total of 81 channels (900 band
applicable)
Actual frequency = 850.125 + CH * 1M
06H
Read /
write
REG3
7
Enable the RSSI bytes
When enabled, the module receives wireless
data and the output through the serial port
TXD will follow an RSSI strength byte.
0
Disable (default)
1
start using
6
transmission mode
During the fixed-point transmission, the
module will identify the first three bytes of
the serial port data as: address high + address
low + channel, and take it as the wireless
transmission target.
0
Transparent transfer (by default)
1
Fixed-point transmission
5
Relay function
After the relay function is enabled, if the
target address is not the module itself, the
module will start a forward;
To prevent data return, it is recommended to
work with fixed point mode; namely, target
address and 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 bring data delay;
The maximum residence time of LBT is 2
0
Disable (default)
1
start using