Ebyte E90-DTU User manual

E90-DTU (433L37)

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 1
Content
1. Introduction.............................................................................................................................................................2
1.1. Brief Introduction................................................................................................................................... 2
1.2. Certificate............................................................................................................................................... 2
1.3. Features...................................................................................................................................................3
2. Operation.................................................................................................................................................................3
3. Installation Specification........................................................................................................................................ 5
3.1. Structure..................................................................................................................................................5
3.2. Dimension...............................................................................................................................................7
4. Interface Defination................................................................................................................................................ 8
4.1. Power interface definition...................................................................................................................... 8
4.2. RS232 Interface definition..................................................................................................................... 8
4.3. RS485 Interface definition..................................................................................................................... 8
5. Technical indicators................................................................................................................................................ 9
5.1. Model specifications...............................................................................................................................9
5.2. Frequency range and channels............................................................................................................. 10
5.3. Air data rate.......................................................................................................................................... 10
5.4. Current parameters............................................................................................................................... 10
5.5. Transceiver Length and Sub-packing Mode........................................................................................ 10
6. Operating Mode.................................................................................................................................................... 11
7. Connection diagram when programming............................................................................................................. 12
7.1. Diagrammatic drawing......................................................................................................................... 12
7.2. Parameter setting instruction................................................................................................................ 13
8. Connection diagram in test and application......................................................................................................... 14
9. E90 Series............................................................................................................................................................. 14
10. Practical application..................................................................................................................................... 15
11.Note..........................................................................................................................................................................16
12.Important statement................................................................................................................................................. 16
Revision history............................................................................................................................................................ 17
About us....................................................................................................................................................................... 17

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 2
1. Introduction
1.1. Brief Introduction
E90-DTU (433L37) is a data transmission station that adopts extremely advanced ultra-narrow band modulation
technology. On the original basis, power amplifier (PA) and low noise amplifier (LNA) are built in, so that the maximum
transmitting power reaches 5w and the receiving sensitivity is also improved to a certain extent. Compared with the
products without power amplifier and low noise amplifier, the overall communication stability is greatly improved.
Different from analog FM stations and modems, digital radio provides transparent RS232/RS485 interface.
The station works in 433MHz frequency band and the communication distance can reach 20km. Wireless digital
radio as a medium of communication, as well as optical fiber, microwave, open wire, there is a certain scope of
application: it provides some special conditions, private network monitoring signals in real-time and reliable data
transmission, low cost, easy installation and maintenance, diffraction capability is strong, flexible network structure, the
coverage is far characteristic, suitable for some more and occasions, such as dispersion and complex geographical
environment with PLC, RTU, rain gauge, level gauge and other data terminal is connected.
1.2. Certificate
E90-DTU has obtained the "radio transmission equipment model approval certificate", whose approval code is ：
CMIIT ID:2017FP5780。
E90-DTU has obtained the "explosion-proof certificate", whose number is: test no. 201711000975
E90-DTU has obtained the "electrostatic surge detection report" issued by China testing institute, whose number is
CNEx18.1461.
E90-DTU has obtained the "appearance 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" (mandatory eu certification), whose verification number is
CCISE180514601V.
E90-DTU has obtained an "FCC certificate" with the ID of 2ALPH-E90-DTU.
E90-DTU has obtained the "RoHS certificate" (mandatory EU environmental protection certification), and its report
number is DTI201807025245.

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 3
1.3. Features
★All the core components of the original import, compared with the current similar imported digital radio, the most
advanced function, the smallest size, the best price.
★Using military-grade LoRa modulation technology, greatly enhance the communication distance and
communication stability.
★Large single package, single package maximum support 197 bytes, Modbus adaptation.
★Simple and efficient power supply design, support power supply device or line pressure mode, support 10~28V
power supply.
★Transmission power up to 5W, and support multi-level adjustable, all technical indicators up to the European
industrial standards.
★Temperature compensators are adopted to make the frequency stability better than ±1.5PPM.
★Operation temperature range: -40℃ ～+85℃, applicable for various harsh environment, it is real industrial grade
products
★All aluminum alloy shell, compact size, easy installation, good heat dissipation; Perfect shielding design, good
electromagnetic compatibility, strong anti - interference ability.
★Power reverse connection protection, over-connection protection, antenna surge protection and other multiple
protection functions, greatly increasing the reliability of the station.
★Powerful software functions, all parameters can be set through programming: such as power, frequency, air speed,
address ID, etc
★Ultra-low power consumption, the standby current is only 50mA (power saving mode and sleep mode power
consumption is lower), the emission current 1.2A.
★Built-in watchdog, and accurate time layout, once an exception, the module will automatically restart, and can
continue to work in accordance with the previous parameter Settings.
2. Operation
Main parts
1、First step is to mount antenna, then battery, making sure the dial switch is on its right status. User gets on the power
by choosing either VCC/GND or power adapter.

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 4
2、Using USB-(RS232) converter or USB-RS (485) converter or other way to link computer and DTU.
3、Firing up two XCOMs, choosing Baud rate 9600bps, 8N1, the setting which serial port transmission can be
achieved.

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 5
4、User needs to open the mode switch first before link DTU with computer if the user wants to modify parameters.
Firing up E90-DTU 数传电台配置软件 (E90-DTU parameter configuration application) to modify related
parameters. The mode switch must be reopened to achieve transmission after the configuration.
模式 0出厂默认状态 模式 2进行参数配置
3. Installation Specification
3.1. Structure

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 6
Pin NO.
Name
Function
Description
1
DB-9 female socket
RS-232 interface
Standard RS-232 interface
2
3.81 terminal block
RS-485, power interface
Standard RS-485 interface and pressure line power interface
3
PWR-LED
Power LED
Red, lit when the power is on
4
TXD-LED
Transmit LED
Yellow, blinks when sending data
5
RXD-LED
Receive LED
Yellow, blinks when receiving data
6
DC power interface
Power interface
In-line round hole, outer diameter 5.5mm, diameter 2.5mm
7
DIP switch
DIP switch
Controlled by working mode
8
Antenna interface
SMA-K interface
external thread, 10mm, 50Ωcharacteristic impedance

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3.2. Dimension
单位：mm

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4. Interface Defination
4.1. Power interface definition
Users can choose ⑥DC power interface, using the power adapter supply with the interface of the 5.5mm outer
diameter , 2.5mm diameter ;
Also choose the VCC and GND terminal power supply, only choose any one of the power supply is OK;
E90-DTU can use 10~ 28V DC power supply, but it is recommended to use 12V or 24V DC power supply.
4.2. RS232 Interface definition
The E90-DTU can be connected to the device via RS-232 using the standard DB-9 interface.
4.3. RS485 Interface definition
E90-DTU can connect the 485_A terminal and 485_B terminal with the device RS-485 A terminal and B terminal.
Pin NO.
Definition
Function
Description
1
VCC
Crimping power interface, positive
10 ~ 28V DC, recommended 12V or 24V
2
GND
Crimping power interface, negative
The power supply negative pole is connected to the system
ground and the housing
3
485_B
RS-485 interface, interface B
The RS-485 interface B is connected to the device interface B

Chengdu Ebyte Electronic Technology Co,;Ltd E90-DTU (433L37) user manual
Copyright ©2012–2019，Chengdu Ebyte Electronic Technology Co,;Ltd 9
4
485_A
RS-485 interface, interface A
The RS-485 interface A is connected to the device interface A
★Note: The transceiver will be in poor communication when connected to multiple devices , it is recommended to be
connected to a single device, please try to use parallel 120Ω resistor between 485_A terminal and 485_B.
5. Technical indicators
5.1. Model specifications
Model
Frequency
Transmit
power
Distance
Specifications
Application
Hz
W
km
E90-DTU (433L37)
433M
5
20
LoRa spread
spectrum, 20km
long range,
anti-interference
It is suitable for the application
environment with small amount of data
and long distance
★Note: Test condition: in clear and open air without shelters, 12V /2A power supply, 5dBi gain sucker antenna over 2
meters height from the ground, with the factory default parameters.
NO.
Model
Specification
Description
1
Size（H*W*D）
124 * 105 * 25 mm
See more at 3.2 Dimension
2
Weight
240g
Tolerance: 9g (5W below 4.5 g)
3
Temperature
-40℃～85℃
Meet industrial level
4
Antenna impedance
50 Ω
Standard 50 Ω characteristic impedance
5
Supply voltage
+10 ~ +28V DC
It is recommended to use 12V or 24V
6
Communication interface
RS232/RS485
Standard DB9 hole / 3.81 terminal block
7
Baud rate
Default 9600
from 1200 to 115200 bps
8
Address
Default 0
65536 configurable addresses